Vents Desk & Ground Lamps Conditioned air is offered underneath the ground and dispersed upward into the room through regularly spaced diffuser tiles, blowers or via ducts directed into specific tools. Automatic hearth protection shutoffs may be required for underfloor air flow, and extra suppression techniques may be installed http://jaredehgie.pointblog.net/Guidelines-For-Subfloor-Ventilation-Some-Helpful-Questions-34379595