"This Ventamatic Automatic Gable Shutter works with Cool Attic gable-mounted power attic ventilators, Models CX1500, CX1600 and CX2500. Note Not for use with VX2515 solar gable. Length ft. 1 3/4, Dimensions L x W x H in. 22 x 22 x 3. Fully automatic louvers open and close when ventilator is operating Felt-padded aluminum louvers for quiet operation For use with CX1500, CX1600 and CX2500 gable power attic ventilators Rough cut opening is 18in. x 18in."
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