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Round Gravity Vents


round vent

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Sidestep poor airflow with Metallic Products’ round gravity vents. These versatile commercial roof vents are designed for economic, low-volume air movement. They are perfect for ventilating warehouses, light industrial buildings, attics, lofts and other buildings requiring relief through gravity ventilation. A natural means of keeping air moving through a space, the gravity vent works without the need for electricity and requires little to no ongoing maintenance. Its adjustable damper makes it easy to regulate the volume of gravity air movement, and to protect your structures from water intrusion related to wind-driven rain and backdraft conditions. Meanwhile, its wide range of available colors and finishes allow it to blend seamlessly with virtually any metal building design.

About Our Round Gravity Roof Ventilators

Standard Sizes

Standard round gravity ventilators are available in 12”, 20” and 24” diameter throat sizes.

Integral Dampers

The damper is supported in the open position by four strong springs and is closed by a 5’ pull chain. Longer lengths are available upon request. Damper may be locked in any position by using the optional key type chain lock. Ventilator may be furnished without damper if desired, however, overspray or driven rain may enter the vented space. Ventilator with damper may function as a smoke exhaust vent by including a fusible link in the chain operator.


26-gauge inner and outer bands, rain shield and base are assembled with four pre-formed baffles into a simple yet sturdy ventilating unit. This design achieves a free, unobstructed flow of ventilated air.

Bird Screen

Assembly requires the installation of a 4 x 4 bird screen in the opening, between the inner band and rain shield, to prevent birds from entering the vent area.


Galvalume finish is standard, Polar White and other colors — including Kynar® — are available.

Base Design

Base is specifically designed for final installation with specified roof slope — either ridge or single slope, and either flat or mounted into the specified roof panel. Base and ventilating unit arrive preassembled, ready for installation. Single-slope bases mount directly to the roof panel and are placed in such a way as to prevent damming.

NOTE: When ordering, please specify roof slope, base type, damper pull chain and paint color.