Patent ID: 7452028

Claim:
A modular comfort assembly adapted for installation within an occupant support having a surface including a recess therein having a periphery, the comfort assembly comprising: a three-dimensional diffuser bag containing an air permeable spacer material allowing for an even flow of air therethrough and adapted to be disposed in said recess and to substantially fill the recess and extend to the periphery thereof, the diffuser bag including: a bottom surface adapted to lay in said recess; a sidewall extending upward from a periphery of said bottom surface; and a top surface formed by a ventilation diffuser having a perforated inner portion lying against and being generally co-extensive with the spacer material, allowing for flow of air therethrough, said diffuser having a non-perforated outer edge portion extending beyond the inner portion and adapted to extend over and cover a portion of the occupant support outwardly adjacent the periphery of the recess, said sidewall engaging said top surface intermediate said perforated inner portion and said non-perforated outer edge portion, and said outer edge portion of said top surface extending outward beyond said sidewall; and a heating element disposed on a surface of the diffuser.