18"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 33.75"h] Return Grille Adjustable airflow control - by Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Adjustable airflow control - by rotating the middle disk

much more than required 700 PSI for R410

actual front end outer dimensions are approximately 24 5/8" width X 38 5/8" height

width: 20px

Tamper-Proof Design – Provides robust protection to prevent unauthorized access and ensure consistent thermostat settings

18"w X 32"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 19.75"w x 33.75"h] Return Grille Adjustable airflow control by Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Adjustable airflow control by rotating the middle disk much more than required 700 PSI for R410