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Charley's Greenhouse
17979 State Route 536
Mt. Vernon, WA 98273
Fax 360-873-8264

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3234 20 inch Economy Shutter (C3110 20)

FREE GROUND SHIPPING in the Continental USA.



Opened by fan draft

Low cost, fresh air inlet. Galvanized steel frame with felt-edged aluminum vanes. Very lightweight for vanes to open and close easily by fan draft. Not for use with shutter motor.

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Photo is INSIDE VIEW for use as an INTAKE shutter to allow cool air in, as with Charley's Economy Fan System. (Vanes are inside the greenhouse.)

Photo is OUTSIDE VIEW for use as an EXHAUST shutter to allow hot air out. (Vanes are outside the greenhouse.)

See Also
3231 12 inch Economy Shutter (C3110 12)
3232 16 inch Economy Shutter (C3110 16)
3238 24 inch Economy Shutter (C3110 24)

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Learn More About
3234 20 inch Economy Shutter (C3110 20)

General Product Information:
Dimensions: 20” x 20”
Color: Aluminum

Shipping Information:
Standard shipping charges apply.


  1. Shutter frame should be mounted level and squarely on outside wall. Care should be taken not to twist the shutter frame. Never cover shutter with siding or masonry work. Shutter should be mounted so it can be removed any time in case of damage.
  2. Shutter should operate as freely after installation as it did before.
  3. Caulking compound is recommended between shutter frame edges and the wall.
  4. Clean and lubricate shutter at the same time that the fan is lubricated and cleaned.

Common Recommendations:

  • We recommend shutter not be mounted closer to the fan than 1/3 the diameter of fan blade.
  • Do not force shutter into opening
  • Do not open shutter by lifting individual blades.
  • Do not install shutter leaning forward or backward.

For further information, please contact Charley's Customer Service at 1-800-322-4707.

This item is backed by Charley's 100% guarantee. If you are not completely satisfied, return your purchase in the condition you receive it, within 30 days, for a refund, exchange or credit - whichever you prefer. If any product is found to be defective within the first year, it may be returned or exchanged for full credit.