18"w X 18"h Aluminum Privacy Door HVAC Air Grille - "V" Shaped Louvers Ensure 100% View Block - Supply or Return Copper Coil-Insulated Line Set then you'll need a 14-inch

then you'll need a 14-inch round vent

+ Product Details Size – 14" x 30" or 30" x 14" is the size for the duct opening measurement only

+ Product Details Size – 16"w X 28"h is the size for the duct opening measurement only

The premium durable material guarantees that they will never rust or wear through

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18"w X 18"h Aluminum Privacy Door HVAC Air Grille - "V" Shaped Louvers Ensure 100% View Block - Supply or Return Copper Coil-Insulated Line Set then you'll need a 14-inch+ Product Details Size 18"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are 19" Width X 19" 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