Uses it’s maximum initial force to open louvers against the suction of the strong partial vacuum created by exhuast fans. Once the louver is open this force is reduced to prevent damage to louver or linkages.
A motorized, rack and pinion driven, roof vent for polyethylene covered greenhouses. The system incorporates an automatic air evacuation system during vent closing to prevent damage to polyethylene or vent components.
Innovative and efficient design using anti-drip technology prevents leaking outside the system; the beveled top cap distributes water most effectively while the 6″ pad width reduces shadows across plants.