Description
These are the the passive fan exhaust shutters that keep the cold air out and warm air in while your fan isn’t running.
Passive Exhaust Shutters For Snap-Fan Greenhouse Fans
- Specifically sized for your 20 inch Snap-Fan
- Corrosion resistant aluminum
- Protect the fan when its not running
- Keep warm air in when needed
- Passive – blown open by fan
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