Abstract: A vacuum accessory may include a head including a head body defining an inlet and a fitting interface, the head body extending from a fitting interface to a base and enclosing a cavity. A fitting includes a fitting body symmetrically disposed about a longitudinal axis of the fitting. The fitting body defines a fitting inlet, an outlet, and a flow path connecting the fitting inlet and the outlet. The fitting is connected to the head at the fitting interface and a fluid flow path fluidly connects the inlet and the outlet. A blade is removably coupled to the head and at least partially disposed within the cavity of the head. The blade includes a flat blade body that is coplanar with a reference plane dividing the fitting body and containing the longitudinal axis of the fitting.

Abstract: Disclosed is a central vacuum system. The central vacuum system comprises a first vacuum device, a second vacuum device, and a hose connected between the first vacuum device and the second vacuum device; the first vacuum device and the second vacuum are controlled by a linked switch, interior of the hose remains positive or slightly negative pressure. A self-operated differential pressure regulating valve arranged at the end of the hose is capable of generating corresponding air resistance under different airflow rate so as to maintain the interior pressure of the hose at a stable slightly positive or negative pressure.

Abstract: A surface cleaning apparatus has a housing defining at least part of a cyclone chamber and a pre-motor filter chamber. In one embodiment, the housing is pivotally mounted to the main body of a hand vacuum cleaner. The housing is moveable between an in use position and an emptying position, in which the cyclone chamber and the pre-motor filter are concurrently openable.

Abstract: A vacuum inlet valve assembly has a housing configured to be mounted exterior to a preexisting wall in a structure such that the housing is connected with a conduit and the conduit is exterior to the wall and retains a hose therein, and the hose is adapted to be pulled out from a stored position within the conduit external from the wall to an extracted position, and when in the extracted position, an end cap or hose plug on the hose is releasably connected with a connection assembly in the housing. A portion of the conduit is clear or translucent or transparent so an operator can watch the end cap or hose plug approach the connection assembly.

Abstract: A retractable vacuum hose system may include a hose having a distal end portion and a proximal end portion and a hose engagement terminal for selectively engaging the proximal end portion to secure the proximal end portion and provide power through the hose.

Abstract: An improved vacuum device for use with a vacuum assisted post hole digger tool. The improved vacuum device includes two suction providing motors with their suction outlets connected in a parallel fashion directly to a filter box. The dual motor configuration provides significantly improved suction power over existing vacuum devices but is still able to be powered on household 120V AC power. The improved vacuum device is paired with a post hole digger apparatus which includes an elongated hollow tubular tool for transmitting vacuum to the base end of the tube. The base end of the tube further comprises a variety bore heads for breaking up soil. A variety of devices for breaking up soil or removing clogs around the bore head are included: a thrasher bar, a hammer bar and an unclogger bar. Each of these devices are designed to be activated either manually by the user by application of force at the upper end of the tool or by application of rotary force by a motor disposed at the top of the housing.

Abstract: A cleaning apparatus including a vacuum cleaner and a docking station is provided. The cleaning apparatus includes a vacuum cleaner including a dust collecting chamber in which foreign substances are collected, and a docking station configured to be connected to the dust collecting chamber to remove the foreign substances collected in the dust collecting chamber. The dust collecting chamber is configured to collect foreign substances through centrifugation, and configured to be docked to the docking station, and the docking station includes a suction device configured to suction the foreign substances and air in the dust collecting chamber docked to the docking station.

Abstract: A cold air blower for removing debris from a ground surface that includes a boom rotatable between multiple operating positions and a stowed position. The boom is mounted to a power unit mounted to the vehicle chassis such that the boom is rotatable between at least a front-facing, operating position and a rear-facing stowed position. The boom includes a top tube and a discharge tube that includes a discharge nozzle. The combination of the top tube and the discharge tube are rotatable about the power unit such that the discharge tube is positioned behind the midpoint of the vehicle chassis in the stowed position. The nozzle on the discharge tube can be operated to automatically and continuously rotate between a first pan position and a second pan position. The boom can be rotated between opposite first and second side positions that extend perpendicular to the vehicle axis in opposite directions.

Abstract: A handheld vacuum cleaner includes a pistol grip which is positioned generally transverse to a longitudinal axis of the vacuum cleaner that runs from a front end to a rear end thereof. It also includes an air inlet positioned forward of the pistol grip, and a vacuum motor configured to draw dirty air into a dirt separator of the vacuum cleaner through the air inlet and exhaust clean air from the vacuum cleaner through an air outlet. The handheld vacuum cleaner further includes an electronic visual display which faces generally rearwards. The handheld vacuum cleaner may be part of a stick vacuum cleaner.

Abstract: A central vacuum cleaning system includes an inlet valve mounted at various locations in a structure or RV and connected to the inlet end of a vacuum conduit. A section of hose is slidably mounted within the conduit and extends from the inlet valve for cleaning an adjacent area. The hose includes a hose plug connected with a distal end of the hose. The hose plug includes an annular channel and an orthogonally aligned slot. The hose plug may also include a first seal and a second seal.

Abstract: A central vacuum cleaner having an outer shell, a suction chamber located inside the outer shell, a suction chamber inlet comprising a fluid passage through the outer shell into the suction chamber, a suction motor inside the outer shell and having a suction motor inlet in fluid communication with the suction chamber and configured to generate a flow of air from the suction chamber inlet to the suction chamber and into the suction motor inlet, an electronic control unit receiver, and an electronic control unit configured to selectively operatively connect to the electronic control unit receiver, and when so connected, control operation of the suction motor, the electronic control unit being selectively removable from the electronic control unit receiver and the suction motor without disassembling the outer shell.

Abstract: A leaf collection vehicle utilizing a vehicle body from a refuse collection vehicle having a receiving hopper, a storage compartment, a tailgate assembly, an operator cab and a packer mechanism for transferring refuse from the receiving hopper to the storage compartment, the refuse collection vehicle body being transformed into a leaf collection vehicle by removably installing a fan assembly within the receiving hopper, the fan assembly providing suction for gathering leaves, a suction hose removably attachable to the fan assembly for collecting and transferring leaves initially to the storage compartment and then to the receiving hopper, and a boom member for holding the suction hose, the boom member being operable from the cab compartment of the vehicle and being movable from a storage position along a side of the vehicle body to an operative position for gathering leaves.

Abstract: A central vacuum cleaning system including a receptacle for receiving dirt; conduits terminating in valves to which a flexible hose may be attached; a motor for generating airflow through the conduits to the receptacle; a motor control circuit controlling power to the motor; and a remote module receiving, through a communications medium from the motor control circuit, signals indicating an operating condition of the central vacuum cleaning system.

Abstract: An adapter for the intake side of an oil and air separation system, including a first end portion capable of replacing an engine oil fill cap, the first end portion connected to an intermediate portion that removably engages with a second end portion including a hose coupling that allows the adapter to be connected to the intake side of an oil and air separation system via a hose.

Abstract: A dust collector in one aspect of the present invention comprises a dust collection portion, a communication portion, and an interlock operation control portion. When the communication portion receives an interlock command transmitted from an electric working machine, the interlock operation control portion makes the dust collection portion operate interlocking with the electric working machine. The interlock operation control portion includes a storage portion, in which identification information specific to the electric working machine with which the dust collection portion is to be made to perform the interlock operation is stored.

Abstract: A system and methods for predicting structural failure of at least a portion of a wall of a fluid containment vessel. The wall has an innermost layer for contact with a fluid contained by the vessel and an outermost layer parallel with the innermost layer. The system includes strain-sensing means within a portion of the wall and surrounded by the at least one reinforcement layer including at least one conductor parallel to the innermost layer of the wall. Changes are sensed in an electrical property associated with the at least one conductor resulting from distortion of the wall of the vessel causing distortion of the at least one conductor.

Abstract: A cold air blower for removing debris from a ground surface that includes a boom rotatable between multiple operating positions and a stowed position. The boom is mounted to a power unit mounted to the vehicle chassis such that the boom is rotatable between at least a front-facing, operating position and a rear-facing stowed position. The boom includes a top tube and a discharge tube that includes a discharge nozzle. The combination of the top tube and the discharge tube are rotatable about the power unit such that the discharge tube is positioned behind the midpoint of the vehicle chassis in the stowed position. The nozzle on the discharge tube can be operated to automatically and continuously rotate between a first pan position and a second pan position. The boom can be rotated between opposite first and second side positions that extend perpendicular to the vehicle axis in opposite directions.

Abstract: A surface cleaning apparatus has an air flow path extending from a dirty air inlet to a clean air outlet with a main air treatment member having a dirt collection region having an openable door and a main suction motor provided in the air flow path. The dirt collection region is exposed to sub-atmospheric pressure when the openable door is in an open position.

Abstract: An apparatus for connecting an electrical device to a high-voltage power grid with a leadthrough plug-in bushing which has a hollow receiving section which extends in a plug-in direction and is composed of an electrically nonconductive insulating material, wherein a metallic contact part is arranged on a closed end region of the receiving section, which metallic contact part extends through the insulating material of the receiving section or lengthens said receiving section in the direction of the closed end region. The apparatus can be assembled and serviced in a simple, quick and therefore cost-effective manner. The receiving section is equipped with a current sensor which is designed to detect an electric current flowing across the metallic contact part.

Abstract: A retractable hose vacuum cleaning system comprising a retractable vacuum hose configured to retract through a dual port valve assembly, into a system vacuum tube responsive to the vacuum communicated from a vacuum source. The dual port valve assembly comprising one port adapted to receive the full length of a retractable vacuum hose into a system vacuum tube for storage, a second port adapted to connect to the hose end fitting and supply electrical grounding, electrical power and vacuum to the hose for use, valve seals to stop air flow through the port that is not in use and a third port to connect the valve to the system vacuum source. The dual port valve assembly also comprises a debris trap.

Abstract: A central vacuum cleaner having a main housing, a suction chamber located inside the main housing, a shelf extending from the main housing into the suction chamber, a suction chamber inlet providing a fluid passage through the main housing into the suction chamber, a suction motor having a suction motor inlet in fluid communication with the suction chamber and configured to generate a flow of air from the suction chamber inlet to the suction chamber and into the suction motor inlet, a mounting flange extending from the suction motor towards the main housing, and a number of clamps. Each clamp is movably mounted to the mounting flange and has a first end movable between a locked position in which the shelf is held between the first end and the mounting flange, and an unlocked position in which the shelf is not held between the first end and the mounting flange.

Abstract: A central vacuum cleaning system includes a locking collar mounted at various locations in a structure or RV and connected to the inlet end of a vacuum conduit. A section of hose is slidably mounted within the conduit and extends therefrom for cleaning an adjacent area. A pair of O-rings within the collar frictionally retains a handle mounted on the end of the hose in a stored position when the hose is in a retracted position and provides an air seal between the handle and vacuum supply conduit. A locking mechanism mounted on the collar automatically locks the hose in a selected extended position when manually pulled from the collar by a locking finger engaging an adjacent section of the hose. An electric switch on the collar enables a user to actuate the vacuum supply source. A mounting bracket enables the collar to be mounted at various locations in the structure and a ring formed on the collar enables the collar to be rotated to a desired position on the mounting bracket.

Abstract: A collection apparatus for collecting waste from cleaning operations performed on an aircraft turbine engine includes a frame structure, a support arm having a first end movably attached to the frame structure and an opposite second end, an actuator device adapted to enable raising and lowering the support arm, a waste storage tank, a duct having an inlet end and an opposite outlet end adapted to be removably connected to the waste storage tank, and a flexible duct portion having a flexible portion inlet end and a flexible portion outlet end. The inlet end of the duct is adjustably supported by the second end of the support arm. The flexible portion outlet end engages the inlet end of the duct in fluid communication, and is bendable both up/down and sideways and is expandable in length between the flexible portion inlet end and the flexible portion outlet end.

Abstract: A dust collector interlocking system includes a transmitter provided in the electric power tool and capable of transmitting a radio signal, and a receiver provided in the suction hose of the dust collector and capable of receiving the radio signal from the transmitter of the electric power tool. The transmitter transmits a drive signal of the electric power tool, and the receiver receives the drive signal of the electric power tool from the transmitter to turn on a start switch of the dust collector.

Abstract: A vaporized fuel processing apparatus includes a case and a heating unit removably attached to the case by a twist lock structure. The case has a tank port and a purge port and contains an adsorbent therein. The tank port communicates with a fuel tank. The purge port communicates with an internal combustion engine. The heating unit has an atmospheric port and a heater. The atmospheric port is open to the atmosphere. The heater is disposed between the atmospheric port and the adsorbent.

Abstract: A central vacuum cleaning system control subsystem for use in a central vacuum cleaning system having a motor includes a central vacuum unit control module with a receiver for wirelessly receiving command signals, and a power stage for controlling the motor in accordance with command signals received through the receiver. The control module is stable in high ambient temperature. Current flowing to the motor is sensed, and motor overcurrent and undercurrent conditions are determined. The control module determines when the motor is in an overcurrent condition. Power stage has a triac for controlling power to the motor. The control module also has a microprocessor that compares the current sensed against a normal operating current to determine overcurrent condition. Power to motor ceases when overcurrent condition exists. A generator is powered by air flow in a cleaning system for production of electrical energy.

Abstract: A central vacuum having a housing, a suction chamber in the housing, a suction motor, a suction chamber inlet, and a utility port. The utility port has a suction opening that leads into the suction chamber, and a utility port door pivotal between a closed position to cover the suction opening, and an open position to uncover the suction opening. Also, provided is a utility port having a suction opening, a door to selectively cover the suction opening, a latch to selectively lock the door closed, a floating plate movably mounted on the door, and a seal between the floating plate and the suction opening. Also, provided is a method for operating a utility port door on a vacuum cleaner suction chamber, the method including pushing the utility port door a first time to close the door, and pushing the utility port door a second time to open the door.

Abstract: A hose line for a fluid, with an exterior support layer; a homogeneous barrier layer arranged within the support layer to prevent diffusion of the fluid; and an electrically conductive strip arranged on the internal side of the barrier layer to discharge electrical charges.

Abstract: A device for suctioning of waste products of a production machine, particularly a sheet extruder, with a suction chamber. At least one suction element extends into a suction space located outside the suction chamber in order to convey waste products in the suction chamber. A suction unit develops a negative pressure in the suction chamber. A sealing means abuts the suction element and locks the suction chamber in a way such that the suction element is movable along the sealing means. The position of the suction element at the suction chamber is variably adjustable.

Abstract: A vacuum cleaner inlet door lighting device for illuminating the area directly in front of a vacuum cleaner wall mounted inlet. The lighting device includes LED's operated upon the opening of a rotatable door have a directional pattern for optimum illumination. The LED's are mounted behind the rotatable door to cause illumination when the rotatable door is open. In an alternative embodiment the LED's are remotely mounted using fiber optic cabling for direction of the light when the rotatable door is opened. When the rotatable door opens the area in front of the wall mounted inlet is illuminated so that the dirt and debris can be seen while being pushed into the collection container. When the rotatable door is closed, the illumination is turned off.

Abstract: Devices and methods are disclosed for determining position and controlling navigation by sensing movement through the Earth's magnetic field. Change in position is determined by integrating velocity which has been normalized for spatial and temporal field variation. Position is registered with respect to starting point and/or subsequently detected environmental feature. Signals are provided to actuator for guidance, navigation and control.

Abstract: A jumper for a connecting terminal arrangement (34) having a contact element (12), which has a contacting area (16) and a holding area (18), and a holding element (14) made from an insulating material is arranged on the holding area (18). The holding area (18) has a perforation (22) which is penetrated by the insulating material of which the holding element is made (14).

Abstract: A central vacuum cleaner having a housing, a suction chamber, a suction motor at an upper end of the suction chamber, a suction motor inlet, a dirt receptacle, a suction chamber inlet into the suction chamber, and a filter bag between the suction chamber inlet and the suction motor inlet cover. The suction motor has an impeller axis and a suction motor inlet located on and surrounding the impeller axis. The suction motor inlet cover has a bottom wall on the impeller axis below the suction motor inlet, a sidewall extending upwards from the bottom wall and surrounding the suction motor inlet, an inlet chamber formed by the bottom wall and sidewall, and an inlet cover opening fluidly connecting the suction chamber to the inlet chamber. The inlet cover opening is offset from the impeller axis and faces at an upwards angle towards the upper end of the suction chamber.

Abstract: A storage system for a vacuum cleaning system has a hose storage structure defining a storage chamber having a storage chamber inlet port and a storage chamber outlet operatively connected to the common chamber operatively connected to a vacuum. The storage chamber defines a chamber cross-sectional area. The hose end carrier defines a carrier cross-sectional area, where the carrier cross-sectional area is slightly less than the chamber cross-sectional area. The hose member defines a hose cross-sectional area, where the hose member cross-sectional area is sized and dimension with respect to the carrier cross-sectional area to facilitate movement of the hose member along the storage chamber.

Abstract: A tank cleaning system used for cleaning oil storage tanks. The system includes a rail vacuum pipe, an air line and a steam line connected to an air/steam mixing box. The mixing box includes an air nozzle, a steam nozzle and a mixing box vacuum tube connected to a vacuum pipe. The vacuum pipe includes a steering, guide rail for receiving a swivel wheel. The swivel wheel is attached to a door opening bracket. The bracket is attached to sides of a tank door opening. The steering, guide rail pivots on the swivel wheel and allows an operator, standing outside the tank, to move the mixing box back and forth for engaging and vacuuming up sediment in the tank.

Abstract: A vacuum system having a housing with a hose end, a filter end, and an attachment end, wherein the filter end is at least partially open, having a vacuum mechanism in an inner cavity of the housing which comprises a vacuum fan in an inner channel that extends from the hose end to near a filter end, the vacuum fan is operatively connected to a motor that functions to control the vacuum fan, having a hose which is fluidly connected to the inner channel, having an attachment brace which functions to help attach the outer end of the hose to a computer system, having a filter, having an attachment means which functions to help temporarily attach the housing to a computer system, having a power button operatively connected to the motor which functions to turn the motor on and off.

Abstract: A flexible stretch hose with a wall which comprises a spirally wound profile (1; 11; 21) in a plastic material. Consecutive windings of the profile are secured to each other by means of a weld. The profile comprises, in cross-section, at least one bottom section (2; 12) and at least one rib section (4; 14; 24), wherein the rib section of the profile, relative to the bottom section, also forms a protrusion of the wall of the hose which gives the hose a predetermined hub strength. The profile comprises an unfoldable section (5; 15; 25) provided in order to be unfolded under the influence of a tensile; force in the axial direction of the hose, thereby allowing an extension of the hose, wherein the unfoldable section comprises at least two profile sections lying loosely against each other, which sections are interconnected at one end.

Abstract: A system for controlling silica dust generated during the transfer of frac sand from a storage container through a conveyor system includes a system of conduits having a plurality of inlets for collecting silica dust generated at selected points along the conveyor system. An air system pneumatically coupled to the system of conduits generates a negative pressure at each of the inlets to induce the collection of silica dust at the selected points along the conveyor.

Abstract: An inlet valve for a central vacuum cleaning system having a central vacuum motor connected to a piping network, is disclosed. The inlet valve includes a main body having an air inlet passageway formed therethrough and a pipe connector to connect the air inlet passageway of the inlet valve to the vacuum piping. An outer door is provided which is pivotally mounted to the main body on an opposite side to said connector and an inner door is provided which is pivotally mounted to said main body at one end between the outer door and the main body and seals the air inlet passageway when the inner door is in a closed position. A releasable latch is operatively connected to the outer door to keep the outer door and the inner door closed on the front of the valve when the inlet valve is not in use and a spring is provided to cause the inner door and the outer door to open upon the latch being released.

Abstract: A flexible hose having an inner tube member made from a thermoplastic elastomer material and an outer tube member made from a non-elastic polyester material. The inner tube member is secured to the outer tube member only at an inlet coupler and an outlet coupler. The inlet coupler is constructed to secure to a water supply provided from a conventional household water spigot. The outlet coupler incorporates a flow restrictor allowing the inner tube member to equalize in pressure with pressurized water received from the water supply. Pressurized water expands the elongated inner tube member longitudinally along a length of the inner tube member and laterally across a width of the inner tube member thereby substantially increasing the length of the hose to an expanded condition wherein the hose contracts to a substantially decreased length when there is a decrease in pressurized water.

Abstract: A central vacuum cleaning system has multiple vacuum sources. The multiple vacuum sources are connected through pipes to wall valves. In use a hose is plugged into one of the valves. A handle is connected to the hose. A wand extends from the handle. Attachments such as a power brush are connected to the wand. Switches apply power from one or more power sources to the vacuum sources. The application of power by the switches is controlled by a control circuit.

Abstract: A subassembly for use in a vacuum inlet valve assembly for a central vacuum system, the subassembly having a valve body with a wiring compartment and at least one press connection detent means and a reversible mounting flange for connecting to the valve body. The mounting flange includes an attachment portion, a mounting flange wall sized and shaped to cover an open side of wiring compartment and press catch connection elements sized and shaped to interact with the detent to secure the mounting flange to the valve body. Also disclosed is a vacuum inlet valve assembly comprising the above subassembly in combination with a cover plate having a rectangular door, a hinge located on a long side of the rectangular door, and a face plate with a vacuum connection opening. In an alternate embodiment the valve body includes a perimeter wall, attachment openings internal but adjacent to said perimeter wall and a snap fit cover to close an open wall of a wiring compartment.

Abstract: A cleaning apparatus is generally composed of a suction unit provided with a suction source, a suction nozzle equipped with a suction port adapted to suck dust or like from a surface to be cleaned, a suction hose connected at one end to the suction nozzle and connected at another end to the suction unit, a low-center-of-gravity support member provided for the suction hose so as to serve as a fulcrum when the suction hose is bent and deformed, a wire member supported at a distal end by the suction nozzle and arranged along the suction hose, and a control unit used to bend and deform the suction hose by manipulating the wire member with the low-center-of-gravity support member serving as a fulcrum. This cleaning apparatus is specifically usable for a bottom surface of a reactor pressure vessel.

Abstract: A flexible garden hose having an inner tube member made from elastic material and an outer tube member made from a non-elastic material. The inner tube member is secured to the outer tube member only at an inlet coupler and an outlet coupler. The inlet coupler is constructed to secure to a water supply provided from a conventional household water spigot. The outlet coupler is coupled to a flow restrictor allowing the inner tube member to equalize in pressure with pressurized water received from the water supply. Pressurized water expands the elongated inner tube member longitudinally along a length of the inner tube member and laterally across a width of the inner tube member thereby substantially increasing the length of the hose to an expanded condition wherein the hose contracts to a substantially decreased length when there is a decrease in pressurized water.

Abstract: A vacuum electronic power tool sense system senses the operation of a power tool that is plugged into an auxiliary outlet box and the vacuum source is automatically operated to facilitate user clean-up of debris generated by use of the power tool. The auxiliary outlet box can be removably mounted to the vacuum housing.

Abstract: A dust-sucking and air-cleaning composite structure is provided with a dust-sucking body and an air-cleaning body. The top surface of the air-cleaning body is provided with a vertically opening cavity. The cavity is recessed downward toward the interior of the air-cleaning body and has an opening facing upwardly. The inner profile of the cavity corresponds to the outer profile of the dust-sucking body, thereby allowing the dust-sucking body to be movably inserted into the cavity to be electrically coupled to the air-cleaning body.

Abstract: The present invention relates to a central vacuum cleaning system for vehicles. The unit comprises a vacuum generating alternating current motor, a built-in direct current to alternating current inverter and a removable dirt cup containing a filter and screen. The unit has a built-in in-take port, which has an auto switch that turns the unit on when the vacuum hose is plugged in and shuts the unit off when the vacuum hose is unplugged. The unit also has a remote in-take and remote auto switch capability so you can plug the vacuum hose into a more convenient location in the interior of the vehicle. The unit can be mounted horizontally or vertically. The unit can be installed in any vehicle consisting of a 12-volt direct current battery. The vehicle does not need to have an alternating current inverter installed separately to operate.

Abstract: A hose which automatically expands longitudinally and automatically expands laterally upon the application of a fluid pressure is disclosed. The hose can automatically expand longitudinally up to six times its unexpanded or contracted length. Upon release of the fluid pressure within the hose, the hose will automatically contract to a contracted condition. The hose includes an inner tube made from an elastic material and an outer tube made from a non-elastic material. The inner tube is positioned concentrically within the outer tube in both a contracted condition and an expanded condition. The outer tube is secured to the inner tube only at a first end of the inner and outer tubes and at a second end of the inner and outer tubes. The outer tube moves laterally and longitudinally with respect to the inner tube when the tubes are transitioning between a contracted condition and an expanded condition.

Abstract: A hose which automatically expands longitudinally and automatically expands laterally upon the application of a fluid pressure is disclosed. The hose can automatically expand longitudinally up to six times its unexpanded or contracted length. Upon release of the fluid pressure within the hose, the hose will automatically contract to a contracted condition. The hose includes an inner tube made from an elastic material and an outer tube made from a non-elastic material. The inner tube is positioned concentrically within the outer tube in both a contracted condition and an expanded condition. The outer tube is secured to the inner tube only at a first end of the inner and outer tubes and at a second end of the inner and outer tubes. The outer tube moves laterally and longitudinally with respect to the inner tube when the tubes are transitioning between a contracted condition and an expanded condition.

Abstract: A central vacuum cleaning system 3 has a central vacuum unit 17 with a motor 10, a motor compartment 19, and a vacuum chamber 25. The system 3 also has a control circuit 1 for controlling power to the motor 10, and one or more airborne contaminant sensors 15 for sensing contaminants within the system 3. The sensors 15 may be located in pipes 31 motor compartment 19, vacuum chamber 25 and hose handle 34. Vacuum air may be drawn through aperture 37 in wall valve 38.