At rear of building, fan #1 over fan #2.
Fans #1 and #2 side-by-side on separate ducts, which lead down to inside separate low-level air exhaust vents.
Continuously run fan on right with emergency air flow switch to turn on second fan and sound trouble alarm. Fans mounted on outside duct.
Dual fans system in combination with posi-vent system over sloped trench, eliminates need for explosion relief panels.
843 N. Cleveland Massillon Road
Suite UP 11C
Akron, OH 44333
Other Patents Pending