40" x 16" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 42w X 18"h] Color_R-4.2 Yellow provides a modern look and

provides a modern look and quiet operation due to its half-inch by half-inch cube design

actual front end outer dimensions are approximately 38 5/8" width X 10 5/8" height

+ Product Details Size - 10"w X 10"h is the size for the duct opening measurement only

+ Product Details Size – 32"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 16" x 20" or 20" x 16" 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] Color_R-4.2 Yellow provides a modern look and40"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