Abstract: An exhaust fan unit of a heating, ventilation, and/or air conditioning (HVAC) system includes an outer fluid path of a nozzle assembly of the exhaust fan unit defined by and between an outer wall of the nozzle assembly and an inner wall of the nozzle assembly, an inner fluid path of the nozzle assembly defined by and radially inward from the inner wall, and a plurality of entrainment ports extending from the outer wall to the inner wall and configured to enable environmental air to pass to the inner fluid path, where each entrainment port includes a bottom surface that tapers downwardly from the inner wall to the outer wall.

Abstract: An exhaust fan unit of a heating, ventilation, and/or air conditioning (HVAC) system includes an outer fluid path of a nozzle assembly of the exhaust fan unit defined by and between an outer wall of the nozzle assembly and an inner wall of the nozzle assembly, an inner fluid path of the nozzle assembly defined by and radially inward from the inner wall, and a plurality of entrainment ports extending from the outer wall to the inner wall and configured to enable environmental air to pass to the inner fluid path, where each entrainment port includes a bottom surface that tapers downwardly from the inner wall to the outer wall.

Abstract: A natural ventilator is herein disclosed that is free of moving parts, wind-activated, rain-proof, and free of dust or smog infiltration. It is not only suitable to be a standalone natural ventilator, but is also advantageous to be used as an enhanced exhaust exit in a forced-air ventilation system, for such enclosed spaces or objects as buildings and vehicles. It can also be used as a suction generator that supplies so-called suction or negative pressure to help stabilize such building components as roof membranes by channeling the low pressure to their underside to balance the wind uplift above. The ventilator has an enhanced rainwater-proof method that serves to defend the vent system, and the space being vented, against rainwater invasion, even if raindrop trajectory becomes highly oblique from vertical as driven by strong winds.

Abstract: There is provided a wind boosted ventilation apparatus for removing exhaust gases from inside enclosed spaces to the atmosphere, said ventilation apparatus comprising a ventilation duct and an external wall having a plurality of openings, a circular pressure plate placed on the top of said ventilation duct, a shroud surrounding said ventilation duct in a such way that a gap is defined between said ventilation duct and said shroud, and a plurality of guide vanes extending outwardly and transversally with respect to the central axis, wherein said openings are extending along said external wall of the ventilation duct and are inclined at a predetermined angle with respect to central axis of said ventilation duct, and said plurality of guide vanes are placed in a such way that they divide the area between the ventilation duct and the shroud into a plurality of compartments.

Abstract: A variable volume induction nozzle is designed for use with a variable speed fan, where fan speed is adjusted in response to variable exhaust gas flow volume in order to conserve energy. In order to maintain a minimum exhaust discharge velocity to ensure adequate plume height, an axially-extendable, upwardly tapered flow-impinging pod within the nozzle creates a variable annular nozzle outlet opening. As opposed to a circumferentially-constricted outlet opening, the variable annular outlet produces a uniform discharge velocity profile conducive to the induction of ambient air through a windband.

Abstract: A water heater heats water with a combustion gas. An exhaust tube includes one end portion and the other end portion, is connected to the water heater at one end portion, and inside thereof is defined as an emission path for the combustion gas. An exhaust pipe is greater in outer diameter than the exhaust tube, and a part of the exhaust tube on a side of the other end portion is introduced in the inside thereof. An exhaust terminal is attached to an end portion of the exhaust pipe and has an exhaust port for exhausting the combustion gas to the outside. An exhaust straightening member is attached to the other end portion of the exhaust tube and has an opening portion for allowing the combustion gas to flow out toward the exhaust port.

Abstract: An aspirating induction nozzle for vertical connection to the outlet of a pressurized exhaust gas flow comprises a central nozzle surrounded by a wind band and one or more guide vanes. Ambient air is induced into a mixing zone within the central nozzle to dilute the primary effluent and increase the volumetric discharge flow rate to achieve greater plume lift. The mixing zone within the central nozzle is protected from crosswind influences, which would otherwise diminish plume lift.

Abstract: An antigen supply device 1 according to the present invention is mainly configured by a cylindrical member 3 extending in the vertical direction. An air suction port 5 for sucking the air in the antigen exposure chamber is provided at a lower end of the cylindrical member. An axial fan 6 that generates a flow of the air flowing upward in an axial direction of the cylindrical member is attached above the air suction port of the cylindrical member. Moreover, a supply port 4 through which high-concentration antigens are jetted from a dust feeder on the outside of the antigen exposure chamber is provided above the axial fan of the cylindrical member.

Abstract: A system includes a substantially sealed, substantially airtight cabinet sized for housing a vertical array of heat-producing units, the cabinet having an exterior shell and the system including an interior divider wall disposed inside the cabinet, the shell and divider wall providing an equipment chamber adapted to support the array such that the array cooperates with the shell and divider wall in use to define a first plenum, the first plenum having a first inlet defined by the divider wall for receiving a flow of cooling gas and having a first outlet defined by a plurality of openings through the array whereby the first plenum communicates with the openings in use to exhaust substantially all of the flow of cooling fluid through the openings and hence through the array, wherein the divider wall is configured to allow the first inlet to admit the gas to the first plenum in a substantially horizontal direction.

Abstract: An exhaust fan assembly is provided for expelling contaminated air from a building. The assembly includes a plenum, a fan assembly attached to the plenum, and a windband mounted on top of the fan assembly. The fan assembly is constructed of cylindrical outer and inner walls which define a bearing chamber and surrounding annular space. A fan driven by a shaft extending downward from the bearing chamber draws exhaust air from the plenum and blows it up through the annular space to a nozzle at the top of the fan assembly.

Abstract: An exhaust system for expelling air from a building includes an outlet nozzle that improves entrainment of ambient air with the building exhaust air. The improved air entrainment results in increased exhaust air dilution and plume height to better disperse the exhaust air away from the building. The nozzle has an H-shaped outlet configuration with two lateral outlet sections joined by a central transverse outlet section. The nozzle has a pair of outer lateral walls, a pair of outer transverse walls, and a pair of sloped inner lateral walls that angle outwards from near an inlet end of the nozzle towards corresponding outer lateral walls. The nozzle can be part of the exhaust system at the outlet side of the exhaust fan within a windband that aids in entraining ambient air with the exhaust air exiting the nozzle.

Abstract: A cap for a flue opening of a chimney in order to enhance draw of smoke and in order to protect from entry of animals, debris, and the elements. The device includes a tubular housing having sidewalls fabricated from flat sheet metal and a top attached to the sidewalls from fasteners. A plurality of louver openings are provided in the sidewalls in order to draw air. A plurality of exit vent openings in the sidewalls above the louver openings are at least equal to a cross-sectional area of the flue opening. An inner frame and mounting assembly includes a mechanism to both anchor the device to the chimney flue and to level the device.

Abstract: A surface mounted device includes a hollowed base body mounted on a building or vehicle exterior, and a hollowed raised body supported and secured on the base body with hollowed elongated members. A free space is formed between the base body and the raised body. An opening or openings are facilitated on, and near the center of, the lower surface of the raised body, to connect the free space with the internal space of the base body through the hollowed raised body and hollowed elongated support members. The base body and the raised body are configured in such a way that the free space between them is narrower at the center than along the perimeter. This forms an airflow path that is first contracting towards the center and then expanding afterwards for any approaching wind direction, providing a venturi mechanism.

Abstract: A gas-exhausting module structure includes a casing having a first open end and a second open end. An air-exhausting channel is defined within the casing. The air-exhausting channel has an upper opening that is lower than the second open end of the casing. A blower comprising a chamber, an air outlet, and an air inlet is provided. The blower is in communication with the air-exhausting channel. The air inlet of the blower is connected to an air-sucking box. When power of the blower is turned on, it sucks air into the air-exhausting channel and expels high-pressure air through the upper opening of the air-exhausting channel.

Abstract: A static venting system includes a first larger geometrically-shaped member having a plurality of outwardly extending vertical louvers with a top margin and a bottom margin; a second smaller geometrically-shaped member is disposed within the larger member and has a plurality of outwardly extending vertical louvers and a top margin and a bottom margin; a cap member is provided with a first portion for affixing the cap member to the top margin of one of the first or second geometrically-shaped member; the base member has a centrally disposed aperture, a portion for affixing the top margin of the other of said geometrically-shaped members thereto and an outwardly extending flange portion for affixing the base member over a vent aperture provided in an external surface; and a means for connecting the base member to the cap member.

Abstract: The present invention relates generally to an exhaust gas back pressure attenuator for truck exhaust stacks. In particular, the present invention is directed toward an improved exhaust gas deflector that reduces the back pressure within the vertical tubular exhaust stacks of over-the-road type tractor-trailer trucks. At highway speeds a number of factors may operate to make it difficult for the engine to force exhaust gas out of the system and into the atmosphere. The present invention is attached to the top of the stack and is designed to create an aerodynamic low-pressure condition that in effect pulls the exhaust gas from the stack, thereby reducing back pressure buildup, decreasing the load on the engine, and increasing the fuel efficiency. A first embodiment of the present invention employs an air wedge to divide a first ambient air volume and cause it to pass on either side of the exhaust stack, thereby creating a pressure differential which operates to pull the exhaust gases thereout.

Abstract: A smoke extraction apparatus consists essentially in a structural shape of a type of a molding plane given to the exterior wall of the footing (2), which forms the common base element of the static module and of the dynamic module. The dynamic module can be indiscriminately associated to the footing (2) according to the climatic conditions of the location or according to the desired level of underpressure, wherein the dynamic module is formed by a ferrule (15) made of a lower cylindrical part (16), which lower cylindrical part (16) extends in the upward direction in a truncate-cone part (17), where the truncated-cone part (7) ends in a turned-down exterior edge (18). The ferrule (15) is also formed surrounding the turbine (13) and is surmounted by the truncated-cone muffle (19), where the small base of the truncated-cone muffle (19) is extended upwardly in a neck (21), which neck (21) surrounds the electric motor (14), where the electric motor (14) keeps the turbine (13) in motion.

Abstract: A surface mounted device includes a hollowed base body mounted on a building or vehicle exterior, and a hollowed raised body supported and secured on the base body with hollowed elongated members. A free space is formed between the base body and the raised body. An opening or openings are facilitated on, and near the center of, the lower surface of the raised body, to connect the free space with the internal space of the base body through the hollowed raised body and hollowed elongated support members. The base body and the raised body are configured in such a way that the free space between them is narrower at the center than along the perimeter. This forms an airflow path that is first contracting towards the center and then expanding afterwards for any approaching wind direction, providing a venturi mechanism.