22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in + Product Details Size – 10in diameter 75 Plenum Box Depth 1267FLR90

+ Product Details Size – 10" x 20" or 20" x 10" is the size for the duct opening measurement only

at predicted low air motion 35 fpm in the zone of occupancy

+ Product Details Size - 12"w X 34"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 14 5/8" height

actual front end outer dimensions are approximately 27 5/8" width X 27 5/8" height

22" x 36" or 36" x 22" Cube Core Eggcrate Return Air Grille Compatible With Duct 8in + Product Details Size – 10in diameter 75 Plenum Box Depth 1267FLR90 + Product Details Size – 10" x 20" or 20" x 10" is the size for the duct opening measurement only at predicted low air motion 35 fpm in the zone of occupancy