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+ Product Details Size – 14" x 20" or 20" x 14" is the size for the duct opening measurement only
+ Product Details Size – 14" X 4" is the opening (vent hole) dimension - actual size is approx
and sound level range of NC 25 to 35
For example
+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 30" OR 30" x 18" duct opening (measured at the opening)
Straight Register Boot 10" X 6" X 5" Round 25 Feet Long + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 14" x 20" or 20" x 14" is the size for the duct opening measurement only + Product Details Size – 14" X 4" is the opening (vent hole) dimension actual size is approx
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