Abstract: Various illustrative embodiments of a system and process for recovering high-quality biomethane and carbon dioxide product streams from biogas sources and utilizing or sequestering the product streams are provided. The system and process synergistically yield a biomethane product which meets gas pipeline quality specifications and a carbon dioxide product of a quality and form that allows for its transport and sequestration or utilization and reduction in greenhouse gas emissions. The system and process result in improved access to gas pipelines for products, an improvement in the carbon intensity rating of the methane fuel, and improvements in generation of credits related to reductions in emissions of greenhouse gases.

Abstract: This document presents an apparatus for a flexible air filter media that can be configured for shipping and storage having one or more flexible inserts mounted to the filter media along one or more portions of the accordion folds of the air filter material. The current invention permits the air filter apparatus to fold along both X and Y axes, create a tri-fold, and bend in a manner that provides for a much smaller volume for shipping purposes. The invention also permits attaching the flexible material to the center of the filter media and also inserts which allow sections of the air filter media to be nested one into another to reduce both shipping and storage volume.

Abstract: Provided are methods and devices for improving microvascular function in humans and mammals. Reduction of exposure to airborne fine particles using air treatment systems increases microvascular function in persons at cardiovascular risk. Preferred treatment systems provide a zone of clean air having >75% reduction in airborne particle counts around a person at cardiovascular risk. The devices and methods can be optimally used during sleep, when the user is stationary for an extended period.

Abstract: An on board inert gas generation system for an aircraft receives air from a relatively low pressure source such as low pressure engine bleed air or ram air and passes it to a positive displacement compressor to increase the pressure thereof to be suitable for supply to an air separation module. The positive displacement compressor comprises a high pressure ratio single stage supercharger with internal cooling.

Abstract: A fracking trailer includes a particulate storage enclosure to receive a mixture of particulate and air in an interior of the particulate storage enclosure having a front end and a rear end. The fracking trailer also includes a filtration system connected to the particulate storage enclosure at the front end to filter particulate from the air in the mixture and exhaust filtered air.

Abstract: An embodiment of a distillation system is disclosed having an influent column with an influent column first end and an influent column second end and having therein, a gas deflector. The influent column may contain at least an influent liquid and vapor from the influent liquid. The influent column first end may be in fluid communication with an influent liquid source. A distillation system is disclosed as having at least one effluent column having an effluent column first end and an effluent column second end and further comprising a condensation chamber adjacent the effluent second end. The effluent column may be positioned within the influent column and may contain at least an effluent liquid and vapor. A primary vacuum source may be in fluid communication with an influent column and positioned at an influent second end. A blower may be provided and connected to the condensation chamber.

Abstract: There is provided an exemplary dust trap and a system and method for filtering air. An exemplary dust trap comprises a housing with an air intake. The exemplary dust trap also comprises a plurality of screens disposed within the housing downstream of the air intake and configured to pass air and capture airborne contaminants, wherein the screens are configured to provide an unscreened air passage between the screens.

Abstract: An air filter arrangement for a work vehicle is disclosed. The air filter arrangement may include a fan shroud extending between a shroud inlet and a shroud outlet and at least one heat exchanger disposed adjacent to the shroud inlet. The air filter arrangement may also include a fan disposed within the fan shroud between the shroud inlet and shroud outlet. The fan may be configured to draw air through the heat exchanger and between the shroud inlet and shroud outlet. Additionally, the air filter arrangement may include an air filter disposed within the fan shroud between the fan and the heat exchanger such that the air flowing through at least one heat exchanger and between the shroud inlet and shroud outlet is directed around the air filter.

Abstract: A casing (10) of an indoor unit (1) contains an indoor fan (21), an air filter (30), and an indoor heat exchanger (22). The indoor unit (1) includes: a divider plate (25) which includes an air hole (26) for attaching the air filter (30) therein, and divides space inside the casing (10) into a room upstream of an air flow passing through the air filter (30), and a room downstream of the air flow passing through the air filter (30); a dust removing mechanism (50) for removing dust trapped on the air filter (30); and a dust container (90) for containing the dust which is removed by the dust removing mechanism (50), and is transferred through a transfer duct (88). The indoor heat exchanger (22) is arranged around the indoor fan (21), and the dust container (90) is arranged below the indoor heat exchanger (22).

Abstract: The present invention relates to a method of pressurising a fluid comprising carbon dioxide, the method includes: obtaining the fluid from a unit for removing carbon dioxide from a process gas; compressing the fluid to a pressure above the critical pressure of carbon dioxide; and cooling the compressed fluid to a temperature above the critical temperature of carbon dioxide to produce a supercritical fluid. The invention further relates to an apparatus for pressurising a fluid comprising carbon dioxide, the apparatus including: means for obtaining the fluid from a unit for removing carbon dioxide from a process gas; means for compressing the fluid to a pressure above the critical pressure of carbon dioxide; and means for cooling the compressed fluid to a temperature above the critical temperature of carbon dioxide to produce a supercritical fluid.

Abstract: Disclosed is an indoor unit having a dust storage container in which dust removed from an air filter is stored, and a dust collecting box into which the dust in the dust storage container is transferred by utilizing an effect of blown air. The dust storage container is provided with a full condition detection means for detecting a dust full condition of the dust collecting box. The full condition detection means includes an LED and a phototransistor which are opposed to each other with a storage portion interposed therebetween. After a dust transfer operation which transfers the dust from the dust storage container to the dust collecting box, an intensity of light of the LED that has passed through the storage portion is detected by the phototransistor. If the detected light intensity is equal to or less than a set value, a full condition of the dust collecting box is detected.

Abstract: In an indoor unit of an air conditioner including an air filter arranged on a suction side of an indoor fan, dust trapped on the air filter is reliably and efficiently removed by a simple structure. For that purpose, an indoor unit (13) is provided with a dust remover (50) for removing dust trapped on an air filter (40) arranged on a suction side of an indoor fan (39), and a filter presser (70) for pressing a frame (42) of the air filter (40) so as to press the air filter (40) against the dust remover (50). The air filter (40) is configured to move relative to the dust remover (50), and the filter presser (70).

Abstract: A system adapted to separate a natural gas feed stream into a sweetened gas stream, at least one liquid waste stream and at least one gaseous waste stream, and to discharge, recover or destroy the at least one liquid waste stream and the at least one gaseous waste stream.

Abstract: An indoor unit of an air conditioner includes: a casing (10); an indoor fan (21); an air filter (30); an inlet port (24) in which the air filter (30) is attached, and a divider plate (25) for dividing space in the casing (10) into a room upstream of air passing through the air filter (30) and a room downstream of air passing through the air filter (30). The indoor unit conditions room air sucked into the casing (0) through the air filter (30). The indoor unit includes a rotating brush (51) for removing dust trapped on the air filter (30), and a dust container (90) for containing the removed dust. An access opening (70) which allows for checking of an electrical component box (72) in the casing (10) is formed in the divider plate (25), and an access lid (71) for closing the access opening (70) is provided.

Abstract: Dehumidifiers having improved heat exchange blocks and associated methods of use and manufacture are disclosed. A heat exchange system in accordance with a particular embodiment can include a plurality of elements with a plurality of airflow channels. A plurality of peripheral spacers are positioned toward edges of neighboring elements and extend in a first direction. A first airflow path extends in the first direction, and is at least partially defined by the corresponding elements and the peripheral spacers. A second airflow path is defined by the airflow channels and extends in a second direction, and an airflow blocker is positioned at a corner portion of the elements to prevent fluid communication between the first and the second airflow paths at the elements. In certain embodiments, the heat exchange system can further include a dehumidifier having an evaporator positioned between the first and second airflow paths.

Abstract: A motor, fan and dirt separating means arrangement for a vacuum cleaner, the arrangement comprising: a motor with a drive shaft; a fan coupled to the motor for generating air flow; and a dirt separating means located in a cleaning path of the air flow, the cleaning path being between a dirty air inlet and the fan, wherein the motor is located in a cooling path of the air flow, the cooling path being between a clean air inlet and the fan, wherein the air flow through the cleaning path is substantially greater than through the cooling path in normal operating conditions and wherein the cleaning path and the cooling path of the air flow combine substantially at the fan inlet. A vacuum cleaner comprising the motor, fan and dirt separating means arrangement.

Abstract: The system for decontaminating industrial output gases may process both particulate and gaseous emissions from industrial facilities. The system may be located with or adjacent to an industrial facility or at some distance from the facility. In one embodiment the system includes a subsystem of alternating active and inactive filters, and a wash subsystem cleaning the inactive filters during the cycle. The wash water is captured in a basin for further processing of the chemical particulates therein. Fans located downstream of the filters draw the gaseous industrial output through the filters. Remaining vapor passes to a classification plant where the gases are separated into their constituent elements or compounds. Gases that are allowed to escape may be burned, and the resulting gases recirculated through the system. Another embodiment is adapted for processing steam, and cools the steam for use as liquid water, rather than allowing it to escape as vapor.

Abstract: The invention discloses a sterilization device (1), to sterilize media, equipment and/or decontamination of waste material, said sterilization device (1) comprising a chamber (2), at least one exhaust line (6) arranged to said chamber (2) and at least one gas generator arranged to said chamber (2), at least two sterile filters (8a, 8b) arranged in series in the exhaust line (6), at least one vacuum means (7) connected to the chamber (2) via said exhaust line (6) and said at least two filters (8a, 8b). At least one heating means (9) is arranged to said exhaust line (6) between said two sterile filters (8a, 8b) in order to vaporize condensate that develops between the filters. Furthermore, it is disclosed a sterilization process for sterilization of media, equipment and/or decontamination of waste material, a vaporizing system (12) of a sterilization device and use of such a vaporizing system (12) in a sterilization device.

Abstract: A compact two-stage granular moving-bed apparatus comprises a vessel, a flow-corrective element, and a filter material supplying part. The vessel comprises a hollow interior, a gas outlet, a first media outlet and a second media outlet. The flow-corrective element divides the hollow interior into a first channel and a second channel. The filter material supplying part has a first provider for providing a first granular material flowing through the first channel and a second provider for providing a second granular material flowing through the second channel, wherein a vertical level of each first and second provider is adjustable so that a first flow path that an exhaust gas flows through the first granular material and a second flow path that the exhaust gas flow through the second granular material is respectively capable of being controlled.

Abstract: Dust collection structure for collecting the dust removed from an air filter of an indoor unit has been devised to reduce user's labor in collecting the dust as much as possible. An indoor unit includes, in a casing, an indoor heat exchanger, an indoor fan for sucking air from inside of a room, and blowing the air to the inside of the room, and an air filter arranged on an inlet side of the indoor fan. The dust trapped on the air filter is removed by the dust removing means, and is contained in the dust containing part. A nozzle connector for arranging a nozzle of a cleaner at a predetermined position where suction of the contained dust is allowed is provided at a downstream outlet of a dust collection path as a transfer path for transferring the dust in collecting the contained dust.

Abstract: A ventilation device uses a cross-flow fan and one or more filters, where the filter preferably has a J-shape that at least partially surrounds the rotor of the cross-flow fan. In one embodiment, the filter includes a plurality of pleats, preferably along a bottom surface of the filter. The filters preferably remove particles, undesired gases, and micro-organisms. A filtration and ventilation system with at least one first ventilation device and at least one second ventilation device larger than the first ventilation device, as well as a method of filtering contaminants out of air using a personal ventilation device, are also disclosed.

Abstract: Disclosed is an installation structure for a dustproof net to be arranged in a machine, which has an engine, a cooling fan for producing cooling air to cool the engine, plural heat exchangers arranged on an upstream side of the cooling fan, and a compartment with the engine, cooling fan and plural heat exchangers accommodated therein, such that the dustproof net is arranged at a position on a side upstream of the heat exchanger located most upstream among the plural heat exchanger relative to a flow of air drawn in by the cooling fan and in isolation from the most upstream heat exchanger to remove dust contained in the air drawn in by the cooling fan. The dustproof net is provided with a support structure for supporting the dustproof net on members that form the compartment.

Abstract: The invention relates to a waste gas system for bioreactors having a hydrophobic sterile filter, arranged at the end, and a heat exchanger which protects the sterile filter against blocking by liquid media. The gas outflow duct for discharging waste gas from a bioreactor vessel is divided in a cooling zone of the heat exchanger into a multiplicity of subducts and is extended in a heating zone of the heat exchanger to a calming zone. Due to the multiplicity of subducts, a considerably larger surface area for the removal of heat from the waste gas is available, with the result that in the case of laminar flow of the waste gas through the subducts a high effectiveness of the separation of liquids from the waste gas can be achieved.

Abstract: A compact two-stage granular moving-bed apparatus comprises a vessel, a flow-corrective element, and a filter material supplying part. The vessel comprises a hollow interior, a gas outlet, a first media outlet and a second media outlet. The flow-corrective element divides the hollow interior into a first channel and a second channel. The filter material supplying part has a first provider for providing a first granular material flowing through the first channel and a second provider for providing a second granular material flowing through the second channel, wherein a vertical level of each first and second provider is adjustable so that a first flow path that an exhaust gas flows through the first granular material and a second flow path that the exhaust gas flow through the second granular material is respectively capable of being controlled.

Abstract: Apparatus for evacuating water and dirt from a cooler box of a cooling system, incorporated with a blow-off for an air screen of the system. The water and dirt will flow through an aperture in a lower region of the cooler box into a smaller box of the apparatus disposed therebelow. A fan operable for generating the air flow through the air screen and the cooler box, also blows a portion of the flow through a blow-off channel to the air screen for blowing debris away from the air screen. The channel and smaller box are cooperatively configured such that the air flow through the channel will generate a partial vacuum condition in the smaller box operable for evacuating the water and the dirt into the channel so as to be carried away with debris from the air screen.

Abstract: A gas purification apparatus capable of removing fine particles of substantially any size without lowering the efficiency of gas supply. A loader module of a substrate processing apparatus includes a fan filter unit for producing a downward flow of atmospheric air in the internal space of a transfer chamber. The fan filter unit includes a fan for generating an atmospheric air flow, a filter of mesh structure for trapping and removing particles mixed in the atmospheric air flow, an irradiation heater disposed between the fan and the filter, and a high temperature part disposed in the atmospheric air flow and higher in temperature than the filter.

Abstract: A reflow apparatus for solder joining electronic components to a substrate includes a reflow chamber, a conveyor to convey a substrate within the chamber, at least one heating element to provide heat to reflow solder on the substrate, and at least one system to remove contaminants generated from the reflow solder. The system is coupled with the chamber for passage of a vapor stream from the chamber through the system. The system comprises a contaminant collection unit in fluid communication with the vapor stream. The contaminant collection unit includes a coil and a collection container. The coil is configured to receive cooled gas therein. The arrangement is such that when introducing cooled gas in the coil, contaminants in the vapor stream condense on the coil, and when ceasing the introduction of cooled gas in the coil, contaminants in the vapor stream are released from the coil and collected in the collection container. Other embodiments and methods for removing contaminants are further disclosed.

Abstract: There is provided an exemplary dust trap and a system and method for filtering air. An exemplary dust trap comprises a housing with an air intake. The exemplary dust trap also comprises a plurality of screens disposed within the housing downstream of the air intake and configured to pass air and capture airborne contaminants, wherein the screens are configured to provide an unscreened air passage between the screens.

Abstract: A method and device for the reduction of particulate forming vapors in gases, the method comprising passing the gas stream through at least one channel (12) that has a wall temperature that is lower than the condensation temperature of the vapor, the at least one channel having a hydraulic diameter (Dh) satisfying the condition that Dh<[24/(N?do)]1/2, where N is the number of nuclei present in the gas stream and do is the initial diameter of the nuclei.

Abstract: A method of removing siloxanes from a gas that contains siloxanes and water, the method comprising: (a) expanding the gas to cool the gas and freeze at least some of the water in the gas; and (b) removing the siloxanes and frozen water from the expanded and cooled gas. The method may also include compressing the gas prior to expanding it. The step of expanding the gas may include expanding it through a turbine. The method may also include using an energy input mechanism to drive one or both of the compressor or turbine. The ice and siloxanes may be removed from the gas with a cyclonic separator.

Abstract: An electronic control unit has a respiratory filter mounted on a waterproof case. Raised protective walls formed in the case surround the portion of the case at which the respiratory filter is arranged. At least two concave portions are provided for drainage that each extend through different positions of the protective walls.

Abstract: A personal ventilation system uses a cross-flow fan and one or more filters, where the filter preferably has a cylindrical or elongated elliptical shape that at least partially surrounds the rotor of the cross-flow fan. The filters preferably remove particles, undesired gases, and micro-organisms.

Abstract: The present invention provides a gas conditioning system for processing an input gas from a low temperature gasification system to an output gas of desired characteristics. The system comprises a two-stage process, the first stage separating heavy metals and particulate matter in a dry phase, and the second stage including further processing steps of removing acid gases, and/or other contaminants. Optional processes include adjusting the humidity and temperature of the input gas as it passes through the gas conditioning system. The presence and sequence of processing steps is determined by the composition of the input gas, the desired composition of output gas for downstream applications, and by efficiency and waste minimization.

Abstract: A ventilation device uses a cross-flow fan and one or more filters, where the filter preferably has a J-shape that at least partially surrounds the rotor of the cross-flow fan. In one embodiment, the filter includes a plurality of pleats, preferably along a bottom surface of the filter. The filters preferably remove particles, undesired gases, and micro-organisms. A filtration and ventilation system with at least one first ventilation device and at least one second ventilation device larger than the first ventilation device, as well as a method of filtering contaminants out of air using a personal ventilation device, are also disclosed.

Abstract: Disclosed is a filter unit for an air conditioner, which is provided at an indoor unit for the air conditioner so as to purify the air discharged to a room. The filter unit includes a filter for purifying air, a filter case accommodated in the filter and having a filter gate at a side thereof for placing/withdrawing the filter, and a cover for opening/closing the filter gate.

Abstract: A method of removing siloxanes from a gas that contains siloxanes and water, the method comprising: (a) expanding the gas to cool the gas and freeze at least some of the water in the gas; and (b) removing the siloxanes and frozen water from the expanded and cooled gas. The method may also include compressing the gas prior to expanding it. The step of expanding the gas may include expanding it through a turbine. The method may also include using an energy input mechanism to drive one or both of the compressor or turbine. The ice and siloxanes may be removed from the gas with a cyclonic separator.

Abstract: An endless filtering sheet, having an interior entrained about rollers, extends in a path of movement over an air inlet in a housing for receiving air flow and presents an exterior from which dirt and debris collected from the incoming air flow and which dirt and debris is removed in a horizontal reach by gravity and/or an air flow. A drive mechanism continuously moves the sheet in the endless path to provide a continuously operating air filtration system for a heat exchanger in a HVAC system that is self-cleaning.

Abstract: An indoor unit of an air conditioner is provided. The indoor unit includes a main chassis constituting a rear appearance, a heat exchanger and a fan disposed in an inner space of the main chassis, and a front frame formed on a front of the main chassis and constituting a front appearance. The front frame includes a suction port for sucking air of a space for air-conditioning, a high-performance filter-mount part formed on one side of the suction port for fixing the high performance filter, a dust-collecting filter-fixing part formed on one side of the high-performance filter-mount part for fixing the dust-collecting filter, and a discharge port formed on one side of the dust-collecting filter-fixing part for discharging air that has been sucked to the suction port.

Abstract: A biogas treatment system removes moisture and other unwanted materials from biogas originating, for example, with a landfill or anaerobic digester. Water and other unwanted materials are thus removed from landfill gas and waste water biogas, while the gas temperature is controlled to a usable level. More especially, the present invention provides for the removal of water and other unwanted ingredients of biogas with a greatly reduced energy requirement when compared to conventional technologies.

Abstract: A trapping device is disclosed which is arranged in a vacuum exhaust system (6) for removing gaseous impurities contained in the exhaust gas flowing through the vacuum exhaust system (6) which has a vacuum pump (36) for vacuum exhausting a processing unit (10) wherein a certain process is conducted on a semiconductor wafer. The trapping device comprises an impurity collecting chamber (50) arranged along the exhaust passage in the vacuum exhaust system (6) and a nozzle means (64) which injects a working fluid that is in a supersonic state due to adiabatic expansion for mixing the fluid with the exhaust gas and lowering the temperature of the exhaust gas to or below the critical points of the impurities within the impurity collecting chamber (50).

Abstract: An air conditioning system, which can automatically remove a malodor generated due to condensate water remaining in an evaporator during a predetermined period of time after operation of an air conditioner or turning-off of the air conditioner and control a filtering mode time of a filter to filter an air. The air conditioning system characteristically comprises a shiftable deodorization filter (30 or 40) located on a flow channel of the cool air passageway and operationally moved to a filtering mode position so as to screen the flow channel of the cool air passageway during a predetermined period of time after an air conditioner is turned on or off, whereby the air passing through the cool air passageway C and a malodor contained in the air are filtered.

Abstract: A biogas treatment system removes moisture and other unwanted materials from biogas originating, for example, with a landfill or anaerobic digester. Water and other unwanted materials are thus removed from landfill gas and waste water biogas, while the gas temperature is controlled to a usable level. More especially, the present invention provides for the removal of water and other unwanted ingredients of biogas with a greatly reduced energy requirement when compared to conventional technologies.

Abstract: A ceiling fan that incorporates into its blades both a system for air purification by removing dust and other particulate pollutants from the air in a room through ionization of the air stream passing over an ionizer grid and also a system for heating and cooling the air stream passing over the blades. The device provides a room conditioner for efficiently heating or cooling and maintaining a room at a temperature comfortable to the user. The device also provides negative ion generation through the use of the ionizer.

Abstract: A catalytic converter designed to be integrated into a food-cooking appliance and to act, during a cooking cycle in a closed atmosphere and without oxygen being admitted from the outside, to treat the odors in the cooking fumes before the fumes are discharged to the outside, the converter comprising a basic substrate (30) provided with perforations (31) for passing the cooking fumes to be treated, the substrate (30) being coated with an intermediate layer (32) having a large surface area, itself provided with a surface component (33) formed of an inorganic solution based on precious metals so as to form the catalytic active layer of the converter, the intermediate layer (32) comprising alumina and cerine so as to form an intermediate layer (32) with a surface area of not less than 150 square meters per gram (m2/g), the amount of alumina/cerine added to the basic substrate (30) lying in the range 30 g/m2 to 35 g/m2, including 15 g/m2 of cerine to 25 g/m2 of cerine.

Abstract: When separating steam and gas from a stream containing, possibly glue-coated, fibre pulp produced by a refiner, the hot fibre pulp is directly fed from the refiner to a separation cyclone (4) placed in a drying channel (2) for drying the fibre pulp. A hot drying air flow having substantially higher temperature, about 160° C., than the fibre pulp is blown through the drying channel so that the separation cyclone is surrounded by the hot drying air flow. The light steam containing fraction separated by the separation cyclone is conducted out of the separation cyclone via an outlet conduit (9) away from the hot drying air flow, whereas the separated heavy fibre containing fraction is conducted out of the separation cyclone directly into the hot drying air flow that entrains the heady fraction to a drying plant. Energy is recovered from the light steam containing fraction and ecologically harmful substances are separated from the latter.

Abstract: A system to significantly improve the air quality in a personal breathing environment. The system includes a blower unit that produces a conditioned air flow, a delivery system that delivers air provided by the blower unit to a person's breathing zone, and a conduit that interconnects the blower unit and the delivery system for directing conditioned air from the blower unit to the delivery system. The delivery system is positioned so that it sends conditioned air around an individual's head and into the individual's personal breathing zone, thereby creating a zone of conditioned air around the individual's head.

Abstract: An appliance for cooking food in a closed atmosphere, the appliance including a bowl (6) and a lid, heater means for heating the appliance, for the purpose of performing the cooking, and a catalytic converter (10) for treating the odors of the cooking fumes before the fumes are discharged to the outside, wherein, the catalytic converter (10) includes at least one heater element, and the appliance further comprises temperature regulation means (12) for regulating the temperature of said heater elements, the temperature regulation means (12) being organized to sense the temperature of the cooking zone.

Abstract: Disclosed herein is a system for simultaneously removing dust and volatile toxic organic compounds. The system comprises a dust collecting unit disposed between an inlet duct and an outlet duct for removing dust, an organic compound removing unit disposed between the inlet duct and the outlet duct for removing volatile toxic organic compounds, and an inlet blower disposed between the dust collecting unit and the organic compound removing unit. The dust collecting unit is made up of a bag filter, which comprises a housing formed in the shape of a box and connected to the inlet duct, a plurality of filtering members, such as cloth or felt, arranged in the housing, and dust collecting layers defined between the housing and the filtering members. The organic compound removing unit comprises an absorbing apparatus for absorbing the volatile toxic organic compounds, and regenerating heaters attached on the outer circumference of the absorbing apparatus.

Abstract: An air decontamination system that cleans air which has been contaminated by a terrorist attack or other means of contamination. The air is drawn into the system, cleaned through the use of filters, and exits the system into an enclosed area where people have gathered to await passage of the danger. The unit is easily turned on and off via a switch.

Abstract: A compact ventilator with high efficiency thermal exchanger and a conveniently exchangeable air filter. The conveniently exchangeable filter enables a ventilator with thermal exchanger to be easily and regularly maintained and serviced, thereby enhancing its practical utility.