An unexpected service call, a surprising discovery, and a compelling demonstration of our expertise in HVAC ventilation in Laval. At AirGreen, every intervention is an opportunity to showcase our professionalism, technical precision, and ability to solve unique problems. This is the captivating story of an unusual service call at a single-family home in the Fabreville neighborhood, where a seemingly simple ventilation issue turned into a full-scale investigation and system restoration.
A peaceful home, disrupted comfort
It all started with a routine call from a homeowner in Laval, concerned about abnormally weak airflow in certain rooms of the house. Despite having a relatively new ventilation system, several grilles were no longer letting air through as they used to. The client suspected a motor failure or a malfunction in the air exchanger. They called on us for a complete ventilation diagnostic.
Full network analysis: the AirGreen method
Upon arrival, our team followed our rigorous diagnostic protocol:
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Inspection of the air exchanger (Venmar AVS model – Constructo 1.5ES HRV)
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Verification of rigid and flexible ducts
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Airflow testing at each intake and exhaust vent
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Check of the exterior grille for any obstructions
The initial findings indicated unusually high static pressure in the duct network—abnormal for this type of setup. The exchanger motor was working perfectly, as were the recently replaced filters.
By inserting an inspection camera into the main duct downstream from the exchanger, we uncovered the unexpected: a dense, compact mass blocking nearly 40 cm of the duct.
Not your typical blockage: the origin of the mystery
We dismantled an accessible section of the metal duct in the attic, and the surprise was total: a large squirrel nest, fully formed, made of twigs, leaves, insulation material, and even bits of plastic from the surrounding environment.
This was not an installation defect but a clear case of animal intrusion. Upon inspecting the outdoor grille, we noticed that the mesh guard had partially detached, leaving an opening just large enough for a small rodent. It had quietly set up residence in the duct, blocking airflow to three rooms in the home.
Technical intervention and full sanitization
Here’s the step-by-step process we used to restore the system:
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Complete removal of the obstruction by hand and using an industrial vacuum.
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Steam cleaning and sanitization of the affected ducts using certified antibacterial solution.
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Replacement of the damaged duct section, which had been weakened by the nest’s moisture.
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Installation of a reinforced aluminum mesh guard on the outdoor outlet to prevent future intrusions.
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Full performance testing post-intervention, with optimized airflow readings.
A lesson for all homeowners
This kind of situation may seem rare, but it’s far from uncommon—especially in wooded areas on the North Shore, like Laval, Blainville, or Sainte-Thérèse. Ventilation ducts, often hidden in attics or walls, are ideal targets for rodents seeking warmth and safety.
We strongly recommend an annual inspection of your ventilation system, particularly in spring and fall when animals are actively seeking shelter. A loose outdoor grille, a disconnected duct, or lack of maintenance can quickly become costly in terms of repairs and comfort.
Customer testimonial: relief and satisfaction
“I never would’ve imagined squirrels were blocking my ducts! Thankfully, I called AirGreen. They found the problem fast, cleaned out the ducts, and now everything works better than before. Thank you for your professionalism!”
Why choose AirGreen for your ventilation service in Laval
Our hands-on experience combined with our state-of-the-art equipment allows us to identify and resolve even the most improbable situations. Every AirGreen technician is trained to handle all types of scenarios:
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Inspection of residential and commercial ventilation systems
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Detection of pressure and airflow problems
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Preventive maintenance of air exchangers and ducts
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Installation of outdoor protections and HEPA filters
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Diagnosis of odors or noises related to ventilation
We proudly serve all of Laval, as well as Montréal, Longueuil, the South Shore, and the North Shore. Every service call receives the same level of care—whether it’s a simple cleaning or a complex structural issue.
Practical tips to avoid this kind of situation
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Visually check your outdoor grilles with each seasonal change
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Don’t ignore strange noises in your ducts (scratching, scuffling)
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Replace your air exchanger filters as per the manufacturer’s instructions
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Schedule annual professional maintenance with a qualified company like AirGreen
Our commitment: quality, safety, and transparency
At AirGreen, we do more than intervene—we prevent, advise, and support our clients throughout every step related to indoor comfort. A simple call can help avoid major issues, improve indoor air quality, and extend the life of your system.
Are you noticing reduced airflow or inconsistent temperatures in your home? Suspect something unusual in your ventilation system? Contact us today. We’ll respond quickly with practical, effective solutions.