US Patent Class 454-- VENTILATION-- MAIN HEADINGS

US Patent Class 454
VENTILATION-- Main Headings

		CLASS NOTES
1	DF	CHIMNEY OR STACK {6}
48	DF	EXTERIOR VAULT OR MANHOLE COVER
49	DF	WORKSTATION VENTILATOR (E.G., HOOD, OFFTAKE, ETC.) {5}
68	DF	ELEVATOR
69	DF	VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
166	DF	VEHICULAR TUNNEL {1}
168	DF	MINE {3}
173	DF	STORAGE AREA FOR PERISHABLES {2}
184	DF	ELECTRONIC CABINET
185	DF	HOLLOW PARTITION {1}
187	DF	CLEAN ROOM
188	DF	HAVING PROTECTING AIR CURRENT {5}
194	DF	BLAST OR SHOCK WAVE PREVENTION
195	DF	MEANS COMBINED WITH DOOR
196	DF	MEANS COMBINED WITH WINDOW {12}
228	DF	HAVING FORCED RECIRCULATION {4}
237	DF	HAVING BOTH INLET AND OUTLET AIRWAYS {6}
254	DF	HAVING INLET AIRWAY {11}
339	DF	HAVING OUTLET AIRWAY {7}
369	DF	FIRE DAMPER
370	DF	MISCELLANEOUS
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		CROSS-REFERENCE ART COLLECTIONS
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900	DF	VENTILATOR USING SOLAR POWER
901	DF	FOG DISPELLER
902	DF	AIR RAID SHELTER VENTILATION
903	DF	FLEXIBLE DUCTS USED FOR CARRYING AIR
904	DF	MAGNETIC MEANS TO HOLD A DAMPER CLOSED
905	DF	BLACK OUT MEANS
906	DF	NOISE INHIBITING MEANS
907	DF	SEAT
908	DF	HAVING ROTARY RETARDER
909	DF	RADON PREVENTION