Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Front View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Side View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Side View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Bottom View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Bottom View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Angle View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Top View
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Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs

Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs

GZL-4-SM-rib

gendzl-sm-rib

Price: $40.00 USD

$40.00 USD
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  • Aluminum Unpainted

    Aluminum Unpainted

  • Plain Black STANDARD+$10

  • Plain White STANDARD+$10

  • Quartz Grey [Weatherwood] STANDARD RAL 7039+$10

  • Terra Brown STANDARD RAL 8028+$10

  • Pine Green STANDARD RAL 6028+$10

-- Please Select --
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Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Front View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Side View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Side View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Bottom View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Bottom View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Angle View
Gendzl Gooseneck Vent with SM-rib Flange, Tailpipe, Damper, & Screen | Model GZL-4-SM-rib | 4-Inch Diameter | For SM-rib Panel Roofs | Top View

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Drawings

Gendzl Low Profile Gooseneck Vent with SM-Rib Flange, Tailpipe, Damper & Screen | Model GZL-4-SM-rib | 4-Inch Diameter

This aluminum gooseneck roof cap is a durable roof exhaust vent designed for bathroom fans, kitchen range hoods, and other ducted exhaust applications. Featuring a low-resistance hinged damper, removable bird screen, and heavy-duty rust-free aluminum construction, it provides reliable, weather-resistant performance for years to come.

High-Performance Ventilation

  • Efficient Exhaust: Engineered to provide smooth, unrestricted airflow for bathroom fans, kitchen exhaust systems, and general ventilation.
  • Easy Duct Connection: Includes a 2-inch tailpipe for quick, secure attachment to 4-inch ductwork.
  • Backdraft Protection: A curved, low-resistance hinged damper opens easily during operation and closes when the fan is off to help reduce drafts and unwanted airflow.
  • Versatile Installation: Designed for roof pitches from 2/12 to 12/12.

Durability & Protection

  • Heavy-Duty Aluminum Construction: Manufactured from corrosion-resistant aluminum for long-lasting, rust-free performance.
  • Pest Protection: Includes a removable bird screen to help keep birds, bats, rodents, and other pests from entering the duct system. (Remove screen for dryer vent applications.)
  • Weather-Resistant Design: The aerodynamic gooseneck hood helps protect against rain and snow while allowing efficient exhaust airflow.

Quality & Performance

  • Built to Last: All-aluminum construction stands up to harsh weather and will not rust.
  • Professional Appearance: The clean, low-profile design complements residential and light commercial roofing applications.
  • Made in the USA: Manufactured with quality materials for dependable, long-term performance.

Need Assistance?

To calculate the exact number of vents needed for your project, please use our [Vent Calculator].

For technical support or sizing questions:

  • Email: sales@roofvents.com

  • Phone: 845-565-7770

Installation

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Calculate number of Model  GZL-4-SM-rib  Vents Needed for a Given Area

Enter the Width and Length of the attic space you need to ventilate to calculate the area. You may also enter the area directly in the "Area" field. It is not necessary to hit the Return or Enter key (which will refresh this page), just enter numbers in the fields.

Enter width of space to calculate area (or enter Area below)
Enter width of space to calculate area (or enter Area below)

If you know it, you may enter the area directly here

The diameter size of all roof vents determines the Net Free Area, also known as the "NFA". NFA is the measured amount of opening each vent offers at each specific size. to be available for venting air through a specific vent size. The calculator below will find the overall number of vents needed to effectively ventilate the targeted attic space.

Once you have the area, the numbers shown below are the number of vents of that size which would ventilate the specified area with both 1/300 and 1/150 rule.

Results Appear Here





*Please note
The roof vent calculation values shown above are for the exhaust portion of the roof. The same amount of net free air inches is needed for air intake as well. Proper roof ventilation consists of 50% air exhaust and 50% air intake.


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