32" x 8" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 34w X 10"h] 18in diameter + Product Details Size -

+ Product Details Size - 34"w X 24"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 27 3/4" x 1"

Actual Filter Size – 24 3/4"w x 9 3/4" x 1"

+ Product Details Size – 25"w X 18"h is the size for the duct opening measurement only

32" x 8" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 34w X 10"h] 18in diameter + Product Details Size -32"w X 8"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 34" Width X 10" Height SEE IN DESCRIPTION HOW TO MEASURE A GRILLE Installs Directly On Round & Oval Spiral Duct No Frames, Box or Other Attachments Needed Commercial Grade Aluminum Will Never Rust Designed for Warehouses, Factories, Workshops, Gymnasiums & Restaurants Easy Unrestricted Air Flow For Your HVAC System 180 Degrees Double Direction