10" X 10" Outdoor Return Air Grille – For Outdoor Use - HVAC Vent Duct Cover Diffuser – [1.0mm Polished Aluminum] [Outer Dimensions: 11.75w X 11.75h] 18in diameter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 34" OR 34" x 24" duct opening (measured at the opening)

The integrated eight-tumbler lock system

Enhanced Filtration: Our filters are 25% thicker than competitors'

+ Product Details Size - 12"w X 22"h X 2"d (for duct opening measurement only)

Lightweight & Portable: Its compact and lightweight nature makes it a valuable addition to any DIY or professional toolkit

10" X 10" Outdoor Return Air Grille – For Outdoor Use - HVAC Vent Duct Cover Diffuser – [1.0mm Polished Aluminum] [Outer Dimensions: 11.75w X 11.75h] 18in diameter + Product Details Perfect Fit10" X 10"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 11. 75 Width X 11. 75 Height SEE IN DESCRIPTION HOW TO MEASURE A GRILLE PROPERLY 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