Model # BH24

Internet #202216814

Store SKU #223974

Construction Metals 12 in. x 24 in. Galvanized Steel Half-Round Dormer Vent

Construction Metals

12 in. x 24 in. Galvanized Steel Half-Round Dormer Vent

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Frequently Bought Together

Product Overview

Designed to provide maximum airflow into the attic, this roof dormer vent has a crimp less face and eliminates the need for sealant or solder. One piece galvanized steel construction and lightweight, with louver blades to deflect rain or snow. 1/4 In. Galvanized Wire Mesh over the 12 In. x 9 In. rough opening prevents birds and large insects from entering attic space. Adequate attic ventilation prolongs the life of the roof and overall structure and lowers utility bills yearlong. Meets FHA requirements.

  • Net free vent area: 100 sq. in.
  • Ventilates 208 sq. ft.
  • Designed for use with composition shingle, shake or flat tile roof
  • Durable galvanized-steel construction
  • Paintable for color matching
  • Installs to composition shingle, shake and flat tile
  • Includes wire mesh to help prevent pest infestation
  • Sharp metal edges, use safety gloves

Info & Guides

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Cut-Out Left to Right Length (in.)
12 in
Net-Free Area (Sq. In.)
Product Depth (in.)
Product Height (in.)
Product Width (in.)


Color Family
Color/Finish Family
Galvanized Steel
Product Weight (lb.)
Screen Included
Half Round
UV Resistant
Vent Type

Warranty / Certifications

Manufacturer Warranty

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Customer Questions & Answers

Hi, I have a house with a length of 120 ft roof how many of this vent I need thank you

Asked by: Bruce
I am a designer and the pro answer is not quite complete. Under 2013 Title 24 Code the formula is as follows: Total attic( or roof area ) in square feet, divided by 150. This gives you total square feet of attic ventilation required. Multiply that number by 144 ( square inches in a square foot ). Vents are specified by net free air flow in square inches. Take your total square inches required and divide that by 2. ( Total number of vents should be balanced between intake and exhaust ) There are many vent shapes, styles, and sizes. I.E. ridge vent, half rounds, gable vent. If you cant balance intake verses exhaust exactly, always provide slightly more intake vents to meet the total net square inch ventilation requirements.
Answered by: ISL2k
Date published: 2017-03-14

do these dormers need to painted inside and outside before installation?

Asked by: lesvelos
They do not "NEED" to be painted, but they will look nicer if they blend with the roof. And they'd only need to be painted on the exterior, no reason to paint on the inside.
Answered by: MilitaryBrat
Date published: 2017-05-26

My home is a single story 1156 sqft how many of these do i need?

Asked by: jackie
You need 6 if you have no other venting (like eave vents).
Answered by: JT
Date published: 2017-06-27

Will it help turn the WhilyBird (turbine) with this dormer vent?

My WhilyBird (turbine) is not turning on my guest house. I want to install this dormer vent on the roof but will it help to turn the WhilyBird?
Asked by: Cagayan
No. If your turbine is not turning when the wind blows you should have it replaced with another or see a roofer for details on other passive exhaust ventilation options.
Answered by: MilitaryBrat
Date published: 2017-05-26
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Customer Reviews

12 in. x 24 in. Galvanized Steel Half-Round Dormer Vent is rated 3.0 out of 5 by 1.
Rated 3 out of 5 by from I returned these and chose a different vent. No... I returned these and chose a different vent. No problem with the product - they were visually far too large for the shed I was going to use them in.
Date published: 2017-08-08
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