12"w X 12"h Aluminum Privacy Door HVAC Air Grille - "V" Shaped Louvers Ensure 100% View Block - Supply or Return w6h6 1/2" White insulation will give

1/2" White insulation will give you a good R value of 3

actual front end outer dimensions are approximately 34 5/8" width X 38 5/8" height

this easy-to-install grille fits seamlessly into any standard return filter opening

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12"w X 12"h Aluminum Privacy Door HVAC Air Grille - "V" Shaped Louvers Ensure 100% View Block - Supply or Return w6h6 1/2" White insulation will give+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are 13" Width X 13" Height Design special "V" shaped louvers ensure 100% view block while ensuring easy un restricted air flow Installation Location Wall or door mount door thickness up to 32mm anodised finish smooth & beautiful High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving