Abstract: A carbon monoxide ventilation system, comprising a carbon monoxide sensor, a fan, and a vent. The carbon monoxide sensor supplies power to the fan when a threshold level of carbon monoxide is detected. The fan includes a motor and a propeller which draws air into the fan unit, and expels the air through the vent. The sensor also includes an indicating device which produces an audio or visual indication that the threshold level has been reached. The indication continues until reset by a reset button.

Abstract: A garage ventilation system for ventilating fumes from a garage. The garage ventilation system includes a garage door having a first side and a second side. A housing has a generally open front wall, a back wall and a peripheral wall extending between the front and back walls. The back wall has a plurality of openings therein. The front wall has a peripheral edge. The housing is positioned in an aperture in the garage door. A plurality of fans is mounted in the housing and each is directed toward the front wall such that the fans draw air into the housing through the back wall and expel air outward through the front wall. A power supply is operationally coupled to the fans. A control is operationally coupled to the fans. A plurality of switches is operationally coupled to the control for manually turning the fans on or off.

Abstract: A ventilation apparatus for a building with a roof is disclosed comprising a housing that has openings for exhausting or supplying air. The housing is fixedly secure to the building and covers an opening in the roof. A propeller fan with a motor resides in and is fixedly attached to the housing. The motor controls the fan speed and direction. The motor is controlled by a variable frequency drive that is powered by a power supply. A plurality of temperature controllers is employed to measure the indoor and outdoor temperatures. The temperature controllers operatively engage the variable frequency drive. A splash diffuser pan is fixedly attached to the roof underneath the opening in the roof. The diffuser pan must be larger in size than the opening in the roof.

Abstract: A fan motor or blower unit attached and manufactured as part of the heating and cooling systems for homes and buildings or attached later to the furnace or air handler, which will vent out the HVAC ducts by removing the residing air. This air duct evacuation system will remove the unwanted warm or cool air from the building or structures air conditioning and heating duct systems, allowing for easier heating and cooling and more allergy friendly building or structure. The ADES will be on a relay switch or temperature controlled thermostat. The ADES will have a motor or blower unit able to pull the amount of the air per cubic feet per minute needed to vent the duct system. The main frame will have insulating stripping around the perimeter to prevent air leakage as well as a self closing and insulative exhaust flap doors. Surrounding the fan blades is a metal wire cage for safety of the blade operation.

Abstract: A ventilation apparatus for a building with a roof. comprises a housing that has openings for exhausting or supplying air. The housing is fixedly secured to the building and covers an opening in the roof A propeller fan with a motor resides in and is fixedly attached to the housing. The motor controls the fan speed and direction. The motor is controlled by a variable frequency drive that is powered by a power supply. A plurality of temperature controllers is employed to measure the indoor and outdoor temperatures. The temperature controllers operatively engage the variable frequency drive. A splash diffuser pan is fixedly attached to the roof underneath the opening in the roof. The diffuser pan must be larger in size than the opening in the roof.

Abstract: A light activated exhaust fan including an exhaust fan disposed above a ceiling area within a building. The exhaust fan is disposed within a housing. The housing has openings within side walls thereof. The openings in the side walls have ducts extending outwardly therefrom. Outer ends of the ducts extend outwardly of the ceiling area for communication with rooms therebelow. The housing has an opening through an upper end thereof. The opening through the upper end has an exhaust vent extending upwardly therefrom. An outer end of the exhaust vent extends outwardly of the building. The exhaust fan is in communication with a power source. A pair of activation mechanisms are secured within the rooms. The activation mechanisms are in communication with an activation receiver of the exhaust fan.

Abstract: A system for detecting and purging carbon monoxide from a confined space such as a parking garage, includes a plurality of carbon monoxide detectors (A) where each detector provides a detection signal (22) if a threshold level of carbon monoxide is detected. An activation circuit (B) receives the detection signal (22) from one or more of the detectors (A) and provides an exhaust fan activation signal (24). A motor starter (C) receives (1) the exhaust fan activation signal (24), and (2) input power (26) such as 110 VAC or 220 VAC, so that when the exhaust fan activation signal (24) is received from the activation circuit (B), the motor starter (C) provides a switched power output (28). An exhaust fan (D) receives the switched power output (28) from the motor starter (C) so that the exhaust fan (D) operates and thereby purges the carbon monoxide from the space.

Abstract: A device for gas detection and exhaustion includes a housing having a duct with an inlet and at least one outlet. A motor having a casing mounted on a housing includes a shaft extending into the duct and propeller means mounted to the shaft for exhausting a gas from the duct. A sealing means associated with the motor and the casing effectively seals the motor from the atmosphere. A gas detector operatively disposed in the housing detects undesirable gas, the detector is operatively connected to an actuating means for actuating the motor when the undesirable gas is detected.

Abstract: A detector in a space to be sensed and controlled gives an electrical signal upon fumes in the space reaching a predetermined level. An electrical circuit is thereby energized to operate a fan to exhaust the space. Inlet and outlet openings in the structure enclosing the space are biased closed but open in response to air pressure on operation of the fan. Also the main door is opened by mechanism actuated by the signal. When the main door is open, the circuitry for opening the main door is open, and there is no actuating the apparatus.

Abstract: An apparatus for the prevention of ice dams on roofs of edifices comprising a ventilator, a first and second outdoor temperature sensor. The first temperature sensor is located outside where snow will not collect. The second outdoor temperature sensor is located on the roof of the edifice where snow will collect. Both sensors are housed to protect the sensors from extreme weather conditions, such as sun and wind. The apparatus also comprises a thermostat for receiving the temperature readings from the first and second temperature sensors and manipulating the ventilator. The apparatus also provides a method of preventing ice dam formation on roofs of edifices, comprising the steps of detecting a first temperature reading of the ambient atmosphere, detecting a second temperature reading of the roof of the edifice, comparing the readings to determine whether conditions exist for ice dam formation, ventilating an air space below the roof of the edifice to cool the roof if ice dam conditions are present.

Abstract: A gas venting system with an electrically operated exhaust fan used in an enclosed garage to expel unwanted gases, especially carbon monoxide, to outside the garage and away from an attached residence. In a garage with a door opener with an automatically operative light fixture, power to operate the electrically operative fan is supplied from the connected light fixture, via an interconnected relay, during the normal preset time interval the door opener's light is operating.

Abstract: A ventilation control device is disposed in a bathroom. The ventilation control device has a switch board, a controller connected to the switch board, a sensor connected to the controller, and a fan motor connected to the controller. The controller outputs a signal to initiate the fan motor to change a rotating speed.

Abstract: An airflow booster fan and control device therefor, the booster fan, preferably of the centrifugal, axial flow type, adapted for in-line installation into a length of duct or at the remotely located end of the duct in an air transfer duct system. The duct system may be one which removes heated and moistened air from a clothes dryer and particularly where the duct system is remotely located from the dryer. The control device delivers electrical power to the booster fan when an air pressure signal from within the duct system in close proximity to, or within, the booster fan is sufficient, as indicative of e.g. clothes dryer operation, to activate the control device to do so. However, a time delay relay in the control device maintains the booster fan in operation after each activating pressure signal for a predetermined length of time, after which the booster fan will be shut off.

Abstract: The disclosure herein describes an apparatus for recovering kinetic energy in a free flowing water stream and converting it into useful energy; it comprises a body (22) immerged in a stream, the body defining a duct having an intake side (26) and a discharge side (27). The discharge side is equipped with a deflector (30) which flares outwardly for obstructing the flow of water around the duct to thereby create a negative pressure drag on water being impelled as it is being discharged from the duct. The deflectors flare outwardly at an angle varying from 75.degree. to 160.degree. as measured from the longitudinal axis of the duct.

Abstract: A range hood having a sleek, modern appearance has a keypad and control circuit which enable adjustment of fan speed and light intensity. The range hood includes a keypad having a linear array of keys which may be individually or collectively used to energize the fan at one of a variety of speeds. A control circuit responds to depression of one or a group of two of the keys and in response selects one of a plurality of possible fan speeds. The array of keys is also used in conjunction with a separate night light key to program the intensity of the light for use as a night light. An automatic shutoff key is used to gradually reduce the fan speed until, ultimately, the fan is deenergized.

Abstract: A driving device which is automatically activated by detecting solar light and an automatic ventilation system utilizing the aforementioned driving device. An electric motor (21) is connected to relay switch (22), which is connected to limit switch (23) and light sensor switch (24). The limit switch (23) is connected between the relay switch (22) and the power supply and a manual main switch (25) between the light sensor switch (24) and the power supply. Normally when the main switch (25) is "on" and solar light exceeds the threshold, the light sensor detects it and the contact of the switch (24) changes to be activated. Electricity is then supplied to the relay switch (22) and the contact of the relay switch (22) also change to be activated. The electric motor is interlinked with a vent cover via the power transmission and the vent cover gradually begins to open.

Abstract: An emergency ventilation system for elevator cabs includes a low voltage power source defined by the secondary winding of a stepdown transformer having its primary winding connected across a primary power source. An emergency power circuit has a single pole, double throw relay located in a normal power position when the primary power source is "on" wherein it connects the low voltage power source to the ventilating fans. The single pole, double throw relay has an emergency position wherein it is positioned to connect the emergency battery source to the ventilating fans so as to operate them independently of the primary power source for providing uninterrupted ventilation to the elevator cab.

Abstract: An emergency ventilation system for elevator cabs includes a low voltage power source defined by the secondary winding of a stepdown transformer having its primary winding connected across a primary power source. An emergency power circuit has a single pole, double throw relay located in a normal power position when the primary power source is "on" wherein it connects the low voltage power source to the ventilating fans. The single pole, double throw relay has an emergency position wherein it is positioned to connect the emergency battery source to the ventilating fans so as to operate them independently of the primary power source for providing uninterrupted ventilation to the elevator cab.

Abstract: The level of a signal voltage of a sensor circuit 9 which changes depending upon the environmental change is detected by comparing the signal voltage with a reference voltage which is constant for a period of time longer than the period of the signal voltage and is momentarily and stepwise changed between a plurality of values. A change in the signal voltage is determined by a determining circuit 14 for operating a ventilation fan. Accurate detection of the environmental change can be made at an improved response even if a power source voltage for the sensor circuit 9 is so unstable or is pulsated that the signal voltage of the sensor circuit 9 has a changing amplitude.

Abstract: In an apparatus in which a smoke density detecting element detects a smoke density in a room to be ventilated so as to automatically start and stop the operation of a ventilating fan in dependence upon whether the smoke density is higher than a predetermined value or not, if a difference between an actual output from the smoke density detecting element and an initial value thereof exceeds a set value, the operation of the ventilating fan is started, but if the difference therebetween becomes lower than the set value, the operation of the ventilating fan is stopped so as to absorb nonuniform measuring accuracy by the smoke density, and further, if the difference therebetween does not become higher or lower than the set value even though a predetermined time elapses after the operation of the ventilating fan is started or stopped, the set value is changed so as to cope with the atmosphere of the inside of the room to the ventilated.

Abstract: A smoke sensor detects a smoke density in a room so as to automatically start the operation of a ventilating fan when the smoke density exceeds a predetermined value, but stops the operation of the ventilating fan when the smoke density becomes lower than the predetermined value. When the predetermined time elapses after the operation of the ventilating fan is automatically stopped, the operation of the ventilating fan is restarted to produce an air stream in the room to be ventilated in order to make the smoke density uniform in the room, thereby it is possible to enhance the degree of accuracy for detection by the smoke sensor so as to make the automatic operation of the ventilating fan appropriate.

Abstract: This invention relates to a fume hood controlling method and apparatus which reduces the amount of replacement air required to operate a fume hood by permitting the fume hood to operate at a relatively low face velocity in the absence of a containment affecting condition, but which is capable of detecting the occurrence of a containment affecting condition, such as the presence or movement of a user within a selected area of the face of the fume hood, and of increasing face velocity to a selected level in response to such detection. When the detected condition no longer exists, the control automatically returns the fume hood to the lower face velocity, preferably with a time delay. Maximum replacement air volume and minimum replacement air volume may also be controlled in response to such detection.

Abstract: A kitchen range hood fan electrically connectable to an atmospheric humidity sensor, such as a dehumidistat. The fan motor is automatically activated when atmospheric humidity readings measured within a dwelling exceed a pre-set limit.

Abstract: A smoker's booth for isolating, containing, venting, and filtering tobacco smoke. The booth has a walled enclosure with a smoker's access aperture. The presence of a smoker is detected, thereby activating the venting, filtering, and lighting mechanisms. The booth can be wall mounted or freestanding.

Abstract: A solar powered exhaust fan having a pipe adaptor for connection to the interior of portable buildings. The exhaust fan may be either DC or AC energized. Automatic and manual switches are provided.

Abstract: A ventilation assembly (10) for buildings (12) such as livestock barns economically and reliably prevents fan motor operation below the minimum speed required for removal of excess moisture and harmful pollutants from a ventilated building and for adequate motor cooling and lubrication. A preferred embodiment includes a fan unit (14) having a fan (18) motor (20), and a speed-responsive centrifugal switch (22), and also includes a speed control unit (16) having a temperature-responsive speed controller (24) and time delay override relay (28). In operation, the centrifugal switch (22) activates the override relay (28) if the motor (20) drops below a predetermined speed for bypassing the speed controller (24) and impose direct line voltage on motor (20) in order to increase its speed to its maximum for a predetermined time as determined by the time delay setting of the relay (28).

Abstract: A power actuated roof vent apparatus generally comprises an insulated air passageway housing through the roof which allows a linear and unrestricted air flow through the air passageway housing when the apparatus is in operation and an insulated passageway closure lid which positively closes the air flow through, and prohibits water ingress into, the air passageway housing when the apparatus is not in operation.

Abstract: An energy saving cover for use in a building having an opening in a ceiling with an attic fan thereabove, the building having a voltage source, the cover including a horizontal frame attachable to the ceiling below the attic fan opening, a cover panel slidable within the frame between a closed position in which the attic fan is fully covered to substantially reduce the passage of air therethrough and an open position in which the attic fan opening is fully opened, and a switch supported to the frame having an "on" and "off" condition and positioned such that the switch is actuated to the "on" position when the cover is in the fully opened position, the switch being in series with the attic fan motor so that the attic fan motor can be energized only when the cover is in the fully opened position.

Abstract: The invention relates to an air extraction apparatus for conditioning air in an enclosed space wherein the air in said enclosed space is stratified due to a temperature gradient between a ceiling and floor of the enclosed space. The apparatus includes a conduit having an inlet end and an outlet end, the conduit adapted to be arranged and installed with its outlet end in communication with an opening in a wall of the enclosure and its inlet end in proximity to the floor when in use. A fan means is located in the conduit to effect movement of air from the floor level of the enclosure through the inlet end to and outwardly of the outlet end. A control means is attached to the conduit and is associated with the fan means to selectively connect the fan means to a source of power, the control means being responsive to a selected condition e.g. relative humidity of the air in the enclosure.

Abstract: An automatic ventilator closure is described which operates on the basis of an over-pressure within the conduit leading up to the ventilator outlet. Electrical interlocks control a motor to place the closure in an open or closed condition.

Abstract: An automatic ventilator closure is described which operates on the basis of an over-pressure within the conduit leading up to the ventilator outlet. Electrical interlocks control a motor to place the closure in an open or closed condition.