When installed properly, all Air Vent products mentioned here comply with the net free area requirements of nationally recognized model codes, including those written by the International Code Council. In addition, the vents have product evaluation approvals from Dade County, Florida, ICC and TDI.

Please call 1-800-AIR-VENT to obtain code body information for a particular Air Vent product.

Here's an overview of the specifications for Air Vent's complete line of ridge ventilation products.

View the wide range of colors in which our products are available in our pdf color chart (12 KB).

Air Vent Color Chart

 Download a PDF version of our color chart

THE SIMPLE MATHEMATICS OF A BALANCED RIDGE VENTILATION SYSTEM

• According to most building codes, you need 1 square foot of ventilation for every 150 square feet of attic floor space.
• For new home construction that includes a vapor retarder, the minimum is 1 square foot of ventilation for every 300 square feet of attic floor space.
• If your vents are split between ridge vents and intake vents, the minimum requirement is also 1 square foot of ventilation for every 300 square feet of attic floor space.

To determine how many feet of net free area you need, use this formula:

To determine how many feet of ShingleVent® II, Multi-Pitch FilterVent® or VenturiVent Plus™ you need, use this formula:

1/2 net free area x 144 ÷ 18 = feet of ridge vent needed

For example: 2.5 (based on net free area of 5 square feet) x 144 ÷ 18 = 20 feet of ridge vent needed

To determine how many feet of Air Vent soffit vents you need, use this formula:

1/2 net free area x 144 ÷ 9 = feet of soffit vent needed

For example: 2.5 (based on net free area of 5 square feet) x 144 ÷ 9 = 40 feet of soffit vent needed

The following charts may be used to:

1. Determine how much net free area is needed to satisfy FHA requirements.

2. Balance your ridge vent system.

DETERMINING VENTILATION REQUIREMENTS

Note: ShingleVent II and Multi-Pitch FilterVent provide 18" of net free area per linear foot.

INSTALLING A BALANCED RIDGE VENT SYSTEM

• Measure the square footage of the attic (length x width).
• Measure the length of the ridge.
• Refer to the chart above for required net free area and minimum length of ridge for attic square footage.
• Note: In most cases, the length of the ridge balanced with the same net free area of intake vents will satisfy FHA minimum standards and most building codes.
• Use the chart below to calculate the amount of intake vents that should be installed to balance your ridge vent system.
• Always install ridge vents from end to end across the entire ridge for best appearance and to provide maximum ventilation area.
• Hip roofs, dormers and T- or L-shaped roofs may require a specially designed ventilation system. For information, request a copy of Air Vent's Principles of Attic Ventilation.See Contact Us.

Balancing Your Ridge Vent System

Learn about warranty coverage, transferability, limitations, other conditions and customer responsibilities.

Read the full warranty and the list of eligible products.

For Warranty information and questions, please contact us at: warranty@gibraltar1.com 

 Download Full Air Vent Warranty Information

Limited Warranty
The Air Vent Product that you have purchased has a limited warranty from the date of purchase against defects in workmanship and materials. The length of the warranty varies by product. Please see attached chart for details. This warranty does not cover any labor costs, including those required for field repair or replacement or removal of any allegedly defective part.

Proof of purchase is required when requesting warranty service.
The original purchaser must present a sales receipt or other document that establishes proof of purchase.
Please do not ship your fan or any fan parts to Air Vent unless requested to do so.

Limitations
Air Vent shall not be liable for, and this warranty does not apply to, any failure, defect or damage resulting from or connected with misuse, abuse, neglect or improper handling or staging , or installation not in strict adherence to Air Vent’s written instructions; impact of foreign objects, fire, flood, earthquake, lightning, hurricane, hail, tornado or other violent storms or other act of God; or defects in failure of or damage caused by materials used as roofing base over which the product is installed or by movement, distortion, cracking or settling of walls or the foundation of the building.

Air Vent reserves the right to discontinue or modify any of its products including color, and shall not be liable as a result of such discontinuation or modification, nor shall Air Vent be liable in the event replacement material may vary in color in comparison to the original product as a result of normal weathering. If Air Vent replaces any product under this warranty, it may substitute products designated by Air Vent to be of comparable quality or price range in the event the product initially installed has been discontinued or modified.

Replacement Plus™ Protection
Products are covered by Replacement Plus™ protection (see attached for applicable products) for a period of time (varies by product) provided that the product has been installed in strict accordance with Air Vent’s written installation instructions. Under this warranty feature, Air Vent, at no charge, will replace any product found to be defective during the Replacement Plus™ period as long as proof of purchase is submitted to Air Vent (Replacement Plus™ period begins when the product installation is completed). Air Vent’s maximum liability under Replacement Plus will be equal to the reasonable cost to replace the defective product, including labor.

In instances in which Air Vent, according to the terms of this warranty, has agreed to pay the cost of labor required to replace a defective intake vent, Air Vent will provide reimbursement only upon receipt of a copy of the contractor’s invoice or other written evidence of the completion of the work which Air Vent, at its sole discretion, deems acceptable.

Transferability
Provided that the products covered by this warranty have been installed in strict accordance with the Air Vent Inc. written installation instructions and in accordance with all local codes and standards, including those pertaining to fire-rated construction, Air Vent warrants to the original purchaser or first subsequent owner of the property that the product is free from manufacturing defects for the described length below from the date of purchase. If there is a change in ownership, the warranty may be transferred by the original purchaser of the product to the new owner (first subsequent owner) under the terms and conditions of this warranty.

Motor Replacements
The electrical motor is to be used solely as a direct replacement for a motor of the same model in an Air Vent, Inc, power attic ventilator. Using the motor in any other product could result in electrical shock and/or fire, which may cause property damage, serious injury or even death. Any motor replacement should be installed by a qualified licensed electrician in accordance with local, state and national electrical codes and standards. Make sure that power to the unit has been completely turned OFF at the breaker before approaching or inspecting the power attic ventilator or installing the replacement motor.

Other Conditions
This warranty is expressly in lieu of all other oral or written warranties, liabilities or obligations of Air Vent. Pertinent state law shall control for what period of time subsequent to sale a consumer/homeowner may seek a remedy pursuant to the implied warranty of merchantability or fitness for a particular purpose. In no event shall Air Vent be liable for consequential or incidental damages of any kind, including any damage to the building, its contents or any persons therein, resulting from the breach of any warranty set forth herein, unless exclusion of these types of damages are specifically prohibited by state law. No field representative of Air Vent or any distributor or dealer is authorized to make any change or modifications to this warranty. This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.

The following warranty is effective 3/26/2021.

Success Story - VenturiVent Plus (with help from the Air Vent App)

Hometown Roofing
Address: 13316 Millard Avenue
Omaha, NE 68137
Phone: Office: 402-896-3639; Cell: 402-681-2180
Website: www.hometownroofing.com
Email: brett@hometownroofing.com

“The homeowner asked us for a bid for a roof replacement due to damage from a hail storm. While walking the perimeter of the house, my salesman noticed that there were only a few soffit vents installed and they were only on one side of the house. This prompted him to open the Air Vent app and calculate how much intake and exhaust that a house/attic of this size should have. The existing roof had roughly 60 ft. of ridge length available and a rolled ridge vent installed. My salesman determined this house would actually require a ridge vent that had increased airflow (that is, more Net Free Area per linear foot) instead of the rolled ridge vent due to the length of ridge present.

He also found that the home needed an additional 13 16” x 8” rectangular undereave vents to balance the intake with the exhaust. Finally, upon removing one of the existing intake vents, he found that the insulation was sandwiched between the roof deck and the exterior wall of the house that extended up into the soffit area. Essentially, this house had no intake at all. We fixed the issues by cutting in the additional undereave vents, adding attic insulation baffles in most of the rafter bays, and installing Venturi Vent plus ridge vent. The homeowner has a beautiful new roof that ventilates properly for the first time ever. ”
 – Brett Huizenga, Owner, Hometown Roofing, Omaha, NE

Editor’s Note: The Air Vent app is a quick, easy way to confirm if the attic has a balanced amount of intake and exhaust vents based on the attic’s square footage (length x width, floor of the attic). If you do not know the actual attic square footage, an acceptable Plan B measurement is the footprint of the house. The app is available free for both IOS and Android devices. 

Click an image to enlarge:

Image 1 & 2) VenturiVent Plus ridge vent installed with 18 square inches of Net Free Area per linear foot.
Image 3) Removing the undereave vent during the attic/roof inspection revealed blocked intake. (low)
Image 4) After the correct quantity of 8” x 16” rectangular undereave vents were installed.