24"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 19.75"h] Compatible With Duct 12in actual front end outer dimensions

actual front end outer dimensions are 15

This Thermostat from Bramec will fit almost any thermostat

High diffusion induction rates result in rapid temperature and velocity equalization of the mixed air mass well above the zone of occupancy

5" - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE

Actual Filter Size – 13 3/4"w x 11 3/4" x 1"

24"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 25.75"w x 19.75"h] Compatible With Duct 12in actual front end outer dimensions+ Product Details Size 24"w X 18"h X 2"d (for duct opening measurement only); actual front end outer dimensions are 25. 75" Width X 19. 75" Height Weather and Pest Proof These louvers are especially designed to prevent water from entering your home, and with a built in back 1 2" mesh they also protect you from annoying rodents like mice, rats, birds, and squirrels High Quality Aluminum The premium durable aluminum will never rust and it will never