(under subclass 421) The combination of ... including means to artificially cause movement of heated or cooled air between the interior and exterior of the body support.
SEE OR SEARCH THIS CLASS, SUBCLASS:
652.2, for cushion supports with forced ventilation.
713+, for air mattresses that may incidentally ventilate a user.
726, for a mattress with forced ventilation.
941, for blankets that provide a forced air flow to a user.
SEE OR SEARCH CLASS 297, Chairs and Seats,
180.13, for seats and chairs ventilated with forced air.
