Rooftop installation for better indoor air quality
At AirGreen , we believe that indoor air quality is as important as thermal comfort. With this in mind, our team recently installed a Venmar air exchanger on the roof of a residential building in the Rosemont–La Petite-Patrie neighborhood of Montreal.
The project aimed to modernize an old ventilation system which no longer ensured adequate air renewal, particularly in the damp areas of the dwelling.
This type of installation, at height, requires specific expertise: safe handling of ducts, airtight insulation and calibration of air flow to comply with the standards of the Quebec Building Code .
Diagnosis and preparation of the site
Before any intervention, we carried out a complete inspection of the existing ventilation network . The client complained of poor air circulation and excessive condensation in certain rooms.
Our measurements confirmed:
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a pressure imbalance between incoming and outgoing air;
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moisture buildup in the return ducts;
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and advanced wear of the fan of the old exchanger .
We recommended a complete replacement with a Venmar EVO5 500 HRV model , known for its energy performance and its ability to operate efficiently even at low temperatures.
Technical installation on roofs: precision and durability
The installation took place on the building's flat gravel roof , where we fixed the new Venmar air exchanger to a galvanized metal base to avoid any vibration.
Our technicians then:
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connected the two main ducts (fresh air and stale air) with insulated sleeves;
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applied high-density insulation to the pipes to prevent heat loss;
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installed an antifreeze heating cable at the condensate drainage point;
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and connected everything to a Venmar wall control unit inside the home.
Particular attention was paid to sealing the passage of the conduits through the roof in order to ensure protection against water infiltration and to extend the life of the system.
Commissioning and calibration
Once the installation was complete, we proceeded with commissioning and airflow calibration according to the manufacturer's specifications.
Using a digital flow meter , we balanced the incoming and outgoing air flows to ensure even ventilation in all rooms .
The results of our measurements:
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Air exchange rate : 0.45 ACH (Air Changes per Hour), ideal for a home of this size;
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Temperature difference between incoming and outgoing air: minimal, demonstrating the heat recovery efficiency of the HRV system;
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Sound level measured at only 32 dB, proof of a stable and well-insulated installation.
Results: purified air, increased comfort, preserved energy
The customer immediately felt an improvement in air quality , especially in areas of high humidity. The musty smell is gone and the system operates quietly, with no noticeable vibration.
In addition, Venmar heat recovery technology reduces energy losses by transferring heat from outgoing air to incoming air, a significant advantage for Montreal buildings subject to harsh winters.
The customer now benefits from healthier air , better controlled humidity levels and a lower energy bill .
AirGreen's expertise in ventilation and HVAC systems
At AirGreen , we specialize in the design, installation and repair of HVAC systems throughout Montreal, Laval, Longueuil, on the North Shore and the South Shore .
Our certified technicians are trained to work on the most recognized brands: Venmar, Lifebreath, Aldes, Panasonic, Fantech and more.
We work on both residential and commercial buildings , always with the same concern: ensuring optimal energy efficiency and lasting comfort for our customers.
Conclusion: an installation that exudes reliability
This project in Rosemont–La Petite-Patrie perfectly illustrates our expertise in installing air exchangers .
Thanks to our rigor, our advanced measuring tools and our attention to detail, we offer each client a ventilation solution adapted to their needs, durable and fully compliant with current standards.