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 Adjustable - Fins Are Manually Adjustable Individually for Optimal Air Distribution

40" x 16" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply.

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
180 Degrees Double Direction Adjustable - Fins Are Manually Adjustable Individually for Optimal Air Distribution

Why HVAC Premium?
You may think of grilles and registers as a generic component of the ventilation system in your house. But they are also the most visible representation of you air system.
With HVAC Premium you get an extra measure of quality that will be visible to your family members and house guests.

How To Measure A Grille
Overall Size:
Measure the size of the air duct/drywall opening. Do not measure the overall size of the register itself, only measure the "hole" in the wall/duct. Every grille has a front end frame, that will overlap at wall joint.
Total outer size of this grille is; listed size +2".

Width vs Height
The first number in a grille size, represents the width, the second number represents the height. Example: If your hole is 20" wide by 14" tall, order a 20x14. If your hole is 14" wide by 20" tall, order a 14x20.

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