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Art's Sheet Metal Mfg. 18 in. Half Round Dormer Vent with Shingle Base, 2-Pack
Regular price $104.81Orders start at $399 — combine any items to reach the minimum. Learn more
Art's Sheet Metal Mfg. 18 in. Half Round Dormer Vent with Shingle Base, 2-Pack
This 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.
Key Features:
- Half round profile: The half round shape offers a traditional louvered dormer vent appearance.
- Shingle base design: The shingle base integrates directly with roof or dormer shingle courses for a weather-tight install.
- 72 sq. in. NFVA: Each vent delivers 72 sq. in. of net free vent area for attic air exchange.
- 18 in. size: The 18 in. vent width suits standard dormer and gable ventilation openings.
- Two per box: The sell unit is a box containing 2 vents.
- Sheet metal built: Constructed by Art's Sheet Metal Mfg., a sheet metal ventilation fabricator.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | Art's Sheet Metal Mfg. |
| Manufacturer model | V918 |
| Sell unit | 1 box of 2 vents |
| Product line | Half Round Dormer Vent |
| Profile / style | Half round with shingle base |
| Nominal size | 18 in. |
| Net free vent area | 72 sq. in. per vent |
| Coverage per unit | 72 sq. in. net free vent area |
| Pack quantity | 2 pieces per box |
| Weight | 11 lb per box |
| Intended use | Dormer / roof exhaust ventilation |
Coverage & How Much You Need:
Each 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.
Fit and Compatibility:
Designed 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.
Frequently Asked Questions (FAQ):
Q: What is included in the box?
A: The box contains 2 half round dormer vents, each 18 in. with a shingle base.
Q: How much ventilation does one vent provide?
A: Each vent provides 72 sq. in. of net free vent area (NFVA).
Q: How is it installed?
A: It installs shingle-style, with the shingle base woven into the surrounding shingle courses for weather protection.
Q: What is it made of?
A: It is fabricated by Art's Sheet Metal Mfg.; the specific metal and finish are not specified in the listing.
Q: How many vents do I need?
A: Divide your required total net free vent area by 72 sq. in. per vent, following attic ventilation calculations and local code.
Expert Verdict — Reviewed by the SuperArbor Pro Desk
Size 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.
Install per the manufacturer's instructions and local building code, and take appropriate fall protection when working on a roof.
Add Art's Sheet Metal 18 in. half round dormer vents to your ventilation package for a clean, shingle-integrated exhaust solution.
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