Combination attic hatch and return filter grill

Cover for an attic fan vent

Device for changing a fluid passage

Domestic gas detection and expulsion appliance

Dual purpose attic fan

Exhaust fan

Exhaust fan having a unitary molded housing

Exhaust header for building ventilator fan

Fire Retardant reinforced plastic duct system

Fluid extraction apparatus

Forced air vent for a roof eave

Heat distorting support clip for air handling luminaire

Inversion type ventilating fan

Kit providing means for mitigating radon from a dwelling

Light activated exhaust fan

Livestock facility ventilation exhaust air dust removal system

Low noise duct system

Method and device for ventilating a home

Method and installation for removing smoke from a monitored spac

Method and system for radon mitigation