When an inadequate ventilation system becomes a public health issue in the workplace
Ventilation in a commercial or industrial setting is far more than just a comfort issue: it is a critical factor for employee health, productivity, and safety. In Laval, a mid-sized manufacturing company recently faced a critical situation caused by a failing HVAC ventilation system. At AirGreen, we were urgently called in to diagnose and correct a problem that was directly endangering employee health. This real-life case perfectly illustrates the consequences of poor indoor air quality, and the importance of regular HVAC maintenance tailored to the specific context of each building.
The context: an invisible issue that escalates quickly
The company, specialized in the production of insulation materials, had noticed a significant rise in sick leave, along with repeated employee complaints: headaches, chronic fatigue, and feelings of suffocation in the afternoons. At first, no one linked the issue to the HVAC system. However, our evaluation quickly revealed an abnormal buildup of CO₂ in certain production zones and poor air circulation caused by an outdated and neglected ventilation network.
Our technical intervention: restoring air quality as a workplace health priority
Our team of experts conducted a complete analysis of the existing ventilation system, beginning with:
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Checking actual airflow against recommended standards
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Assessing the condition of ducts, grilles, filters, and exchangers
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Measuring CO₂ levels, humidity, and fine particle concentrations in different areas of the facility
The diagnosis was clear: the ducts were clogged with industrial buildup, filters were blocked, and there was no functioning heat recovery or fresh air exchange system in place.
We quickly proposed and installed a mechanical ventilation system with heat recovery (HRV) from Venmar, model EVO5 700 HRV Commercial, capable of handling up to 700 CFM—perfectly suited to the needs of this Laval business.
Results: drastic improvement in air quality and fewer health complaints
Just weeks after the intervention, the results were undeniable:
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A 60% drop in CO₂ levels in previously critical zones
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A return to optimal indoor humidity and temperature levels
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A significant reduction in health-related complaints like headaches and fatigue
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An overall improvement in employee well-being, confirmed through an internal survey
Why is commercial ventilation so often overlooked?
At AirGreen, we often observe that in many commercial or industrial buildings across Montréal, Laval, Longueuil, the North Shore, and the South Shore, HVAC ventilation is often neglected. Several reasons explain this:
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Lack of visibility—air is invisible and its quality hard to perceive
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Absence of sensors or intelligent controls
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Confusion between air conditioning and ventilation
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Misunderstood initial costs, even though the long-term savings are substantial
Practical advice for building managers
Based on this experience, here are our key recommendations for any manager or business owner in Québec:
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Have your indoor air quality assessed annually by a professional
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Ensure preventive HVAC maintenance, including duct cleaning, filter replacement, and airflow calibration
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Invest in intelligent ventilation systems with CO₂, humidity sensors, and automated controls
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Choose certified high-performance equipment like Venmar EVO5 units or Lennox Core Commercial solutions
AirGreen’s expertise: custom ventilation solutions
At AirGreen, we tailor each HVAC installation to the building’s real conditions: square footage, number of occupants, type of activities, acoustic and energy constraints. Our expertise is based on:
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Precise diagnostics based on on-site measurements and real-world data
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Concrete solutions with high energy-efficiency systems
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Comprehensive support, from design to installation, followed by regular maintenance
A high-performance commercial ventilation system is the guarantee of a healthy, compliant, safe, and sustainably productive work environment. It’s also an economic lever for any business aiming to retain its workforce and enhance overall performance.