Patent ID: 8568211

Claim:
A positive pressure air purification system comprising: a forced air duct system and a unit including a housing, a fan, an air filter, and a damper, wherein: said housing has a room air inlet, an outlet, and a supply duct air inlet connected to a forced air duct system; said fan is disposed in said housing between the damper and the outlet; said air filter is disposed in said housing; said damper is disposed in said housing and adapted for movement between a first position and a second position; wherein the positive pressure air purification system when said damper is in said first position allows air to pass through said forced air duct system, through said supply duct air inlet, through said air filter to said outlet and prevents air from said room air inlet to pass through said air filter; and wherein the positive pressure air purification system when said damper is in said second position allows air said forced air duct system, through said supply duct air inlet, through said air filter to said outlet and allows air from said room air inlet to pass through said air filter to said outlet.