UFAD Series Fan Powered VAV
UFAD SFPVAV
In this configuration the fan box intake is fitted with a damper that allows air to be taken from the room in heating mode or from the plenum in cooling mode. As cooling demand varies, either room air or hot-water reheat is used to temper the cooling supply air delivered to the space. In heating mode, the intake damper goes to a minimum position to allow minimum ventilation while the remaining air comes from recirculated room air. Heat is added via the reheat coil as needed. Room air conditions are slightly stratified, but mixed conditions exist to approximately 6 foot level during design cooling and heating operation, negating most displacement advantages.
Because this system delivers air via an underfloor plenum, be sure to include a raised floor/underfloor plenum height when drawing the rooms that will be assigned to this system.