12" x 12" 4-WAY SUPPLY GRILLE - DUCT COVER & DIFFUSER - LOW NOISE - For Ceiling - With Opposing Damper Blades 14" Diameter while the included installation screws LO246 Product Details Size 32 Compatible with Duct 4"

while the included installation screws make setup quick and hassle-free

+ Product Details Size – 20" x 22" or 22" x 20" is the size for the duct opening measurement only

+ Product Details Size – 12"w X 22"h is the size for the duct opening measurement only

and smooth surface

12" x 12" 4 WAY SUPPLY GRILLE DUCT COVER & DIFFUSER LOW NOISE For Ceiling With Opposing Damper Blades 14" Diameter while the included installation screws LO246 Product Details Size 32 Compatible with Duct 4" while the included installation screws make setup quick and hassle free + Product Details Size – 20" x 22" or 22" x 20" is the size for the duct opening measurement only