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Class Information
Number: 454/251
Name: Ventilation > Having both inlet and outlet airways > With air pump means
Description: Subject matter comprising air moving means for forcing air into or out of the ventilated space.










Sub-classes under this class:

Class Number Class Name Patents
454/252 For both inlet and outlet airways 72
454/253 For outlet airway 42


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8610870 Air-cooling apparatus and display device having the same Dec. 17, 2013
8516648 Indoor unit of air conditioner Aug. 27, 2013
8267164 Energy recovery and humidity control Sep. 18, 2012
8152608 Solar energy intercept and waste heat recovery system Apr. 10, 2012
8124009 Method of aeration disinfecting and drying grain in bulk and pretreating seeds and a transverse blow silo grain dryer therefor Feb. 28, 2012
7789740 Crawlspace air apparatus Sep. 7, 2010
7757686 Vent assembly for combustion gases generated by an appliance Jul. 20, 2010
7582008 Centralized device for distributing and discharging air installations Sep. 1, 2009
7572179 Ventilation system Aug. 11, 2009
7563160 Ventilating apparatus Jul. 21, 2009
7516649 System and method for determining duct leakage and fan flow efficiency Apr. 14, 2009
7487646 Sleeping capsule Feb. 10, 2009
7137881 Protective bed unit Nov. 21, 2006
7094142 Portable device with interchangeable air cleaning modules for cleaning the air outside of an existing enclosed space and delivering the cleaned air into the existing enclosed space Aug. 22, 2006
6979260 Method and device to prevent indoor release of carbon monoxide and smoke from combustors Dec. 27, 2005
6966830 Device for ventilation and/or air circulation Nov. 22, 2005
6958010 Crawl space ventilation system Oct. 25, 2005
6948553 Modular heat recovery ventilation system Sep. 27, 2005
6926602 Crawl space ventilation system Aug. 9, 2005
6843718 Method of guiding external air in a building shell and a building; and a method of temperature control of a building Jan. 18, 2005
6835128 Ceiling mounted air filtering and distribution apparatus operated independently of any HVAC system Dec. 28, 2004
6623351 Transportable collective protection system Sep. 23, 2003
6517430 Supply air system Feb. 11, 2003
6321997 Method for operating a stove in a building, and a device for carrying out this method Nov. 27, 2001
6287191 Combination bath fan, register box, air conditioning and heating boot Sep. 11, 2001
5725426 Portable and disposable sterilized operating environment Mar. 10, 1998
5722483 Air exchange apparatus and method Mar. 3, 1998
5718627 System and method for smoke free elevator shaft Feb. 17, 1998
5554071 Air-change system for a multi-storey building Sep. 10, 1996
5413529 Multi-component housing May. 9, 1995
5206173 Air hood Apr. 27, 1993
5194041 Ventilation system for isolators Mar. 16, 1993
5176316 System for alleviating and reducing moisture beneath a roofing structure Jan. 5, 1993
5173094 Positive-pressure filter arrangement for hazardous gases Dec. 22, 1992
5123874 Knock-down sound attenuating system Jun. 23, 1992
5101604 Subterranean well welding habitat Apr. 7, 1992
5097749 Rolling ramp inlet Mar. 24, 1992
4993484 Air to air heat exchanger Feb. 19, 1991
4982653 Method and apparatus for ventilating an enclosure accessed by a manhole Jan. 8, 1991
4955285 System for covering the energy requirement of a room Sep. 11, 1990
4953450 Crawl space ventilator system Sep. 4, 1990
4951555 Show case for keeping and exhibiting objects Aug. 28, 1990
4942805 Ventilated panel Jul. 24, 1990
4923352 System for manufacturing semiconductor under clean condition May. 8, 1990
4920866 Anti back draft device for flue May. 1, 1990
4917004 Robot traveling duct for clean room Apr. 17, 1990
4905579 Radon gas ventilation pump system and method Mar. 6, 1990
4892030 Airflow distribution system for discharging air from a thin plenum, and oven employing same Jan. 9, 1990
4874042 Corrugated cardboard heat exchanger Oct. 17, 1989
4874127 Climate control apparatus Oct. 17, 1989

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