Fresh air intake shutter.
Shutter typically stays closed keeping your greenhouse warm.
When the exhaust fan turns on, negative pressure is created therefor opening shutters and bringing in fresh air.

• 24″ $100.00
• 30″ $150.00
• Fits Fan Diameter. 24 In.,
• Shutter Overall Size 27 In. x 27 In.,
• Shutter Construction Material G-90 Galvanized Steel Frame and Tie Rods,
• Shutter Opening Required 24-1/2 In. x 24-1/2 In.,
• Blade Material Mill Finish Aluminum