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Class Information
Number: 454/230
Name: Ventilation > Having forced recirculation > Forced recirculation alone
Description: Subject matter wherein the air moving apparatus contacts and directly moves only existing air within the ventilated space.










Sub-classes under this class:

Class Number Class Name Patents
454/233 For use with heating or cooling means 111
454/232 Having plural or branched recirculation ducts 25
454/231 Having recirculating duct connecting upper and lower room air strata 35


Patents under this class:
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Patent Number Title Of Patent Date Issued
8616842 Columnar air moving devices, systems and method Dec. 31, 2013
8568211 Damper for positive pressure air cleaner Oct. 29, 2013
7850513 High efficiency solar powered fans Dec. 14, 2010
7762765 Fan with attachment hooks Jul. 27, 2010
7670400 Motor mount assembly for an air cleaner Mar. 2, 2010
7662035 High efficiency solar powered fan Feb. 16, 2010
7591867 Ventilation system Sep. 22, 2009
7485169 Semiconductor manufacturing facility utilizing exhaust recirculation Feb. 3, 2009
7459002 Modular presentation apparatus having integral air processing apparatus Dec. 2, 2008
7455582 Solar powered fan for portable enclosure Nov. 25, 2008
7381129 Columnar air moving devices, systems and methods Jun. 3, 2008
7332006 Ventilating and air purifying device Feb. 19, 2008
7244179 Suspension type oscillation mechanism Jul. 17, 2007
7147553 Portable smoking room Dec. 12, 2006
7105037 Semiconductor manufacturing facility utilizing exhaust recirculation Sep. 12, 2006
7044851 Air handling system for specialized facility May. 16, 2006
7037188 Systems for delivering conditioned air to personal breathing zones May. 2, 2006
6974381 Drop ceiling air flow producer Dec. 13, 2005
6955596 Air flow producer for reducing room temperature gradients Oct. 18, 2005
6923716 System and method for protection against nuclear, biological and chemical (NBC) contamination Aug. 2, 2005
6852025 Vertical ventilator for outdoors and/or indoors Feb. 8, 2005
6790249 Apparatus and method for screening people and articles to detect and/or decontaminate with respect to certain substances Sep. 14, 2004
6709475 Installation for processing wafers Mar. 23, 2004
6692348 Methods and systems for controlling a mailroom environment Feb. 17, 2004
6431979 Wall curb for HVAC system Aug. 13, 2002
6375697 Apparatus and method for screening people and articles to detect and/or to decontaminate with respect to certain substances Apr. 23, 2002
6361431 Method for ventilating an internal space by rotating air flow Mar. 26, 2002
6325835 Air-purifying system blower module with exhaust chute Dec. 4, 2001
6248014 Self-contained activity module Jun. 19, 2001
6152451 Ventilation device for a gaming table Nov. 28, 2000
6123618 Air movement apparatus Sep. 26, 2000
5970987 Laterally and interstitially vented humidor Oct. 26, 1999
5941767 Air circulating device Aug. 24, 1999
5778607 Portable smoker's booth Jul. 14, 1998
5690165 Ventilation device for a space zone Nov. 25, 1997
5649997 Air vacuum apparatus Jul. 22, 1997
5624311 Method and apparatus for room temperature equalizing and air treatment Apr. 29, 1997
5562286 Casino gaming table having a ventilating device for removing smoke Oct. 8, 1996
5562539 Clean space system Oct. 8, 1996
5537787 Portable smoking booth Jul. 23, 1996
5499868 Self-supporting data processing desk module with detachable and longitudinally shiftable exhaust fan assembly and adjustable angle, reversible video deck bridges with front and rear continuous Mar. 19, 1996
5493808 Controlled atmosphere storage chamber Feb. 27, 1996
5468184 Air circulation system for enclosed structures Nov. 21, 1995
5453049 Corner air filtration unit Sep. 26, 1995
5441279 Smokeless casino gaming table Aug. 15, 1995
5417433 Ventilated gaming table assembly May. 23, 1995
5403232 Utility distribution system for furniture Apr. 4, 1995
5358443 Dual fan hepa filtration system Oct. 25, 1994
5322473 Modular wall apparatus and method for its use Jun. 21, 1994
5312465 Filtration apparatus with bag-like plenum chamber May. 17, 1994

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