VMAX Vs. Whirlybird Vents: All You Need To Know

November 11, 2021

VMAX Vs. Whirlybird Vents: All You Need To KnowProper ventilation is crucial to maintain a safe and healthy environment inside any home. Improper ventilation can lead to mold, mildew, and rot in your attic space and on the underside of your roof deck. It can also lead to attic rain and ice dams in the winter and spring seasons.Moreover, this also may affect the R-value of your insulation due to temperature, condensation and humidity in the attic.This blog post mentions the differences between the two commonly used ventilation systems. Moreover, in the end, we have also given a verdict about which ventilation system performs better.

Types Of Ventilation Systems

There are two main types of ventilation systems: Passive ventilators (examples are low-profile ridge vents and square/turtle vents) and Static ventilators. Passive ventilators work together with the air intake vents (i.e. the soffits) to balance air incoming and rising up to exhaust out the roof deck. Static ventilators also work in conjunction with the air intakes but also provide removal of hot and humid air from the attic through air exchange and pressure differentials. Additionally, on a roof slope less than 8/12 pitch, passive vents may not provide adequate protection for exhaust venting with the heavy snow load experienced in Southern Alberta. Regarde le film Joe Weider’s Bodybuilding Training System, Session 1: Introduction to the Weider System en streaming Vf et Vostfr d-bol pro igf 1 reviews bodybuilding – igf 1 des for sale Hence, many contractors and homeowners chose static ventilators for superior attic ventilation. There are different types of static exhaust ventilators, however, the most common are whirlybird turbine ventilators and Ventilation Maximum ventilators.

VMAX Ventilators Vs. Whirly Birds

Ventilation Maximum (VMAX) vents and Whirlybirds are both static ventilators but their basic principle of operation is different. The Whirlybirds use a turbine that runs when the wind blows while the VMAX vents have no moving parts.Some of the main differences between the two are:

Drawing Power

The VMAX ventilators have higher drawing power. With wind flowing at 4 miles per hour, Ventilation Maximum vents can replace the attic air of an average size home of 1200 sq. ft, at a rate of 418 cfm in 20 minutes. To replace this, you will need an average of two 14 inch or three 12 inch whirly wind ventilators.

No Moving Parts

VMAX vents don’t have any moving parts, instead, they have small openings on both sides. So, when the wind blows and passes through the vent, it creates a convection system for the hot air in the attic letting it blow out from one of the openings.In comparison, the whirlybird vents have turbines that move due to the wind causing the hot air to move out. On top of having low drawing power, due to the turbine, the vent can be noisy. Moreover, the turbine requires a lot of maintenance. Even small amounts of rust can cause it to jam.


For the whirlybird vents to prevent infiltration, the turbine has to be moving at all times. This means when there is no wind, snow and water can easily infiltrate the vent. This not only affects the moisture level in the attic but can also cause the internals of the vent to rust. Moreover, the system is susceptible to snow coverage.VMAX vents, on the other hand, are high. Hence, due to their height, they can withstand an abundance of snow without being covered. Moreover, the vents are designed such that no water or snow can infiltrate no matter how windy, rainy or snowy it is. The system is built to withstand winds of up to 175 km/h.


Based on the information provided above it is no secret that the VMAX vents are a better option as compared to whirlybird vents or other turbine vents. VMAX ventilators also have a built-in wire mesh grill to protect your house from birds and other animals.

About AKRoN Roofing

At AKRoN roofing we recommend and offer Ventilation Maximum for enhanced attic exhaust ventilation on roofs 6/12 pitch and less. These vents are made of steel and manufactured in Canada. The models we use are VMAX-301 and VMAX-303. The former has sloped flashing from 2/12 to 15/12 and can cover a ventilation area of 1000 to 1200 square feet. The latter has sloped flashing from 2/12 to 15/12 and can cover a ventilation area of 700 to 800 square feet. Please visit the Ventilation Maximum website for more information.AKRoN Roofing offers premium and detail orientated roofing solutions in Calgary. We provide a wide range of the best roofing materials in the market and hold the highest installation standards for all roofs. AKRoN Roofing is a proud member of the Alberta Allied Roofing Association.We offer a variety of products for sloped roof replacements with a Class 4 rating from UL, including SBS modified architectural shingles, Euroshield recycled rubber shingles, and F-wave Synthetic shingles. Our other services include, but are not limited to, residential re-roofing with asphalt shingles, TPO membranes for flat roofing, roof repairs, and inspections of all types of roofing material by our qualified team.AKRoN Roofing is proud of its A+ rating with BBB plus other certifications and accreditations. You can check out our accreditations and certifications here. Contact us here for more information.

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