Protect your roof and your wallet from heavy damages

With The Best Ventilation Products
Available Everywhere in North America

Why Ventilate?

A Dryer Attic in Winter

A Cooler Attic in Summer

Why Ventilate in Summer?

Summer heat, trapped in the attic, creates a furnace effect, heating ceiling insulation, which then conducts heat through to the ceiling, and this heat is then radiated downward to persons and objects in the rooms below. This is why it is much warmer upstairs in the bedrooms than downstairs in the basement! Other problems that arise by this are the curling, or the bleeding of shingles, and the warping of the sheathing. The air conditioner is working continuously to cool down the living area.

Why Ventilate in Winter?

Winter conditions bring a different type of problem. During the cold months of the year, the air inside the home is warmer and carries more water vapor than the colder, dryer air in the attic. Cooking, laundry, showers, humidifiers and other activities using water contribute to this condition. There is a strong natural force, termed “vapor pressure”, that causes water vapor to migrate from high-humidity air or materials to low-humidity air. This migration of water vapor passes through ceilings, insulation and wood and even successfully circumvents a vapor barrier. It moves into the attic space where it can readily condense into liquid water on the cooler structural members-rafters, trusses, and especially the cold roof sheathing. Condensation moisture within an attic or ceiling space can dampen and compress insulation. Even small amounts of condensation can have a substantial effect in reducing the “R” value of the insulation, thus creating faster heat loss into the attic space. This will eventually lead to mold, mildew, rot, ice damming, etc…

Roof Ventilators
Maximum Ventilators are CSA approved and do not require to rotate to prevent water or snow infiltrations. Its unique storm proof system prevents infiltrations while at the same time capturing the wind flow from all directions.
Air Intakes
The lack and / or limitation of fresh air intake is one of the important causes of the presence of condensation, mildew and deterioration of the insulation in the attic. Maximum Ventilation Ltd. has studied these issues and designed and developed unique products that will resolve these deficiencies.
Roof Exhaust Traps
VMAX CT is the best quality roof exhaust on the market. Designed to discharge kitchen range hoods, bathroom fan and dryers, the built-in damper opens to release the exhaust air and closes once released, creating a hermetic barrier, thus reducing your energy bills. The built-in deflector will prevent any back drafts and clapping of the damper while also deflecting the flow towards the sides of the unit, reducing the risks of melting snow creating ice dams.
Wall Exhaust Traps
VMAX AF exhaust trap is unique to the market. Designed as an exhaust for bathroom fans, dryer and kitchen range hoods, it can also be used as a termination point for a HVAC system. Its versatile design also allows it to be easily converted from an exhaust vent to an air intake vent thanks to its removable damper.


Use our unique calculator to determine what materials will be required for your project.


Do you have a question? Please check our Frequently Asked Questions for a possible answer.


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Dedicated Support For Our Partners

At Ventilation Maximum, our team of qualified engineers and technical sales representatives are available to quickly answer all of your question. We offer all the tools you require to make your job easier backed by comprehensive support. Get answers to your questions via email or call our direct phone line.