{"product_id":"art-s-sheet-metal-mfg-v918-art-s-sheet-metal-mfg-18-in-half-round-dormer-vent-with-shingle-base-2-pack","title":"Art's Sheet Metal Mfg. 18 in. Half Round Dormer Vent with Shingle Base, 2-Pack","description":"\u003ch1\u003eArt's Sheet Metal Mfg. 18 in. Half Round Dormer Vent with Shingle Base, 2-Pack\u003c\/h1\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eThis is an 18 in. half round dormer vent from Art's Sheet Metal Mfg. with a shingle base for roof integration, sold as a box of 2 units. It provides 72 sq. in. of net free vent area per unit for attic or dormer exhaust ventilation. Install it shingle-style on dormer or roof faces and pair with compatible intake ventilation.\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eKey Features:\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHalf round profile:\u003c\/strong\u003e The half round shape offers a traditional louvered dormer vent appearance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShingle base design:\u003c\/strong\u003e The shingle base integrates directly with roof or dormer shingle courses for a weather-tight install.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e72 sq. in. NFVA:\u003c\/strong\u003e Each vent delivers 72 sq. in. of net free vent area for attic air exchange.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e18 in. size:\u003c\/strong\u003e The 18 in. vent width suits standard dormer and gable ventilation openings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTwo per box:\u003c\/strong\u003e The sell unit is a box containing 2 vents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSheet metal built:\u003c\/strong\u003e Constructed by Art's Sheet Metal Mfg., a sheet metal ventilation fabricator.\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch2\u003eSpecifications Table:\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eArt's Sheet Metal Mfg.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eV918\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSell unit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 box of 2 vents\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHalf Round Dormer Vent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProfile \/ style\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHalf round with shingle base\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNet free vent area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e72 sq. in. per vent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCoverage per unit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e72 sq. in. net free vent area\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePack quantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 pieces per box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e11 lb per box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDormer \/ roof exhaust ventilation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003chr\u003e\u003ch2\u003eCoverage \u0026amp; How Much You Need:\u003c\/h2\u003e\u003cp\u003eEach 18 in. vent provides 72 sq. in. of net free vent area. Divide your required total NFVA by 72 to determine the number of vents needed, balancing exhaust against intake ventilation.\u003c\/p\u003e\u003ch2\u003eFit and Compatibility:\u003c\/h2\u003e\u003cp\u003eDesigned to be installed shingle-style with asphalt or other roof shingle courses on dormers and roof faces; flashing and roofing nails are sold separately. Ventilation requirements should be calculated per local code.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eFrequently Asked Questions (FAQ):\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is included in the box?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The box contains 2 half round dormer vents, each 18 in. with a shingle base.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How much ventilation does one vent provide?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Each vent provides 72 sq. in. of net free vent area (NFVA).\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How is it installed?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It installs shingle-style, with the shingle base woven into the surrounding shingle courses for weather protection.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: What is it made of?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e It is fabricated by Art's Sheet Metal Mfg.; the specific metal and finish are not specified in the listing.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eQ: How many vents do I need?\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Divide your required total net free vent area by 72 sq. in. per vent, following attic ventilation calculations and local code.\u003c\/p\u003e\u003chr\u003e\u003ch2\u003eExpert Verdict — Reviewed by the SuperArbor Pro Desk\u003c\/h2\u003e\u003cp\u003eSize dormer vents from your attic's required NFVA, typically 1\/150 or 1\/300 of attic area depending on vapor retarder and net free area ratios per code. Keep exhaust and intake balanced so the assembly actually moves air. The shingle base must be lapped correctly into the shingle courses and sealed at the perimeter to prevent wind-driven rain intrusion.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eInstall per the manufacturer's instructions and local building code, and take appropriate fall protection when working on a roof.\u003c\/em\u003e\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eAdd Art's Sheet Metal 18 in. half round dormer vents to your ventilation package for a clean, shingle-integrated exhaust solution.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Art's Sheet Metal Mfg.","offers":[{"title":"Default Title","offer_id":53529529287023,"sku":"V918","price":104.81,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/436504_default_hero.jpg?v=1790351031","url":"https:\/\/superarbor.io\/products\/art-s-sheet-metal-mfg-v918-art-s-sheet-metal-mfg-18-in-half-round-dormer-vent-with-shingle-base-2-pack","provider":"Super Arbor","version":"1.0","type":"link"}