Self contained heating/cooling roof top unit with built in independent pressure relief

A self-contained pre-manufactured air unit for installation on a roof top of a building and connection to said building for circulating air through said building, said unit comprising a housing having a first air inlet and a first air outlet, said first air outlet being connected into said building, said housing having a blower to force ambient air from said first air inlet through said first air outlet into said building, said housing having a second air inlet, said second air inlet being connected into said building to transport return air from said building into said housing, said housing having a third air inlet and a second air outlet, said second air outlet being an exhaust outlet, said third air inlet being connected into said building and being connected to said second air outlet independently of said second air outlet and independently of said blower to provide pressure relief to said building.

A self-contained pre-manufactured air unit for installation on a roof top of a building, said unit comprising a housing having a blower therein, said unit being self-contained and pre-manufactured, said housing having an ambient air inlet and having two openings for connection to said building, said blower being connected to force air into said building through a first of said two openings and to return air from said building to said blower through a second of said two openings, said unit having a pressure relief opening for connection to said building to receive air from said building, said pressure relief opening being independent of said ambient air inlet, said two openings and said blower, said pressure relief opening being connected to ambient air to exhaust air from said building when a pressure of air within said building exceeds a pressure of said ambient air.

A self-contained pre-manufactured air unit for installation on a roof top of a building for circulating air through said building, said unit comprising a housing have a blower therein, said blower being connected to a first duct connection point and a second duct connection point, said first and second duct connection points being connected into a circulation system to circulate air into and out of said building, said unit having a pressure relief opening with a third duct connection point for connection to said building, said pressure relief opening being independent of said blower and being connected to exhaust air from said building to ambient air when air pressure within said building near said third duct connection point exceeds a pressure of said ambient air.

A method of relieving air pressure from a building having a self-contained pre-manufactured air unit installed on a roof top of said building, said unit having a blower for circulating air through said building, said method comprising locating a pressure relief opening in said unit for connection into said building, connecting said pressure relief opening to ambient air to exhaust air from said building when a pressure of air in said building exceeds a pressure of ambient air, connecting said pressure relief opening to be independent of said blower.