40" x 16" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 42w X 18"h] fixed bar + Product Details Size –

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

+ Product Details Size – 22"w X 30"h is the size for the duct opening measurement only

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+ Product Spec Sheet Aluminum Return Grille Spec Sheet

+ Product Details Size – 18"w X 6"h is the size for the duct opening measurement only

40" x 16" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 42w X 18"h] fixed bar + Product Details Size –40"w X 16"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 42" Width X 18" 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