Schaefer Shutter Fans Size:SF1276-1 If you need to add

If you need to add a door to your existing greenhouse

Works with heating or cooling

157 4000 4

Trays sold separately in case of 16 trays

1:5 = 6 gallons x 175 = 1050 square feet

Schaefer Shutter Fans Size:SF1276-1 If you need to addDescription Specs FAQs The Schaefer Shutters Fans are equipped with louvers to keep the heat where it belongs: in your greenhouse. If you're having trouble keeping the hot air in your greenhouse during cold months, then you need a shutter fan. Shutter intakes are placed on the opposite end of the greenhouse. They are motorized to prevent the wind from opening them when ventilation is not necessary. For added protection against greenhouse humidity,