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Retro-Fit Model 400
A 22 gauge aluminized steel and powder coated (similar to finish on dryer appliance). Top port measures 4 7/8" x 3 1/8" oval shape. The distance from mounting flange to rear of box is 4" and overall measurements: 21" h x 11 1/2" w x 4" deep, inside measures 9 1/2" wide x 18 1/4" tall and four mounting 3/16" holes on flange

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