HVAC Premium Heavy Duty Universal Adjustable Tube Cutter Set For Cutting - Copper, Steel, Aluminum (1/8" - 5/8") (3/16" - 1") (1/4" - 1-1/4") 4in diameter Example: If your hole is 4 X 12 Is CRFG2028 Width_14in

Example: If your hole is 20" wide by 14" tall

+ Product Details Size – 20"w X 16"h pleated MERV 8 filter for HVAC return filter grille - 3 Pack

+ Product Details Size – 30" x 36" or 36" x 30" is the size for the duct opening measurement only

+ Product Description Explore the innovative Toe Space Grill – a game-changer for efficient heating and cooling in spaces with fixed furniture

actual front end outer dimensions are approximately 34 5/8" width X 28 5/8" height

HVAC Premium Heavy Duty Universal Adjustable Tube Cutter Set For Cutting Copper, Steel, Aluminum (1 8" 5 8") (3 16" 1") (1 4" 1 1 4") 4in diameter Example: If your hole is 4 X 12 Is CRFG2028 Width_14in Example: If your hole is 20" wide by 14" tall + Product Details Size – 20"w X 16"h pleated MERV 8 filter for HVAC return filter grille 3 Pack