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Ventilation System Inspection

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The cleanliness of ventilation systems constitutes a crucial factor in ensuring air quality in a building. Over time, dust accumulates in their filters and on internal surfaces. Excessive accumulation of dust in the ducts and central unit can impact negatively on indoor air quality since mould spores and bacteria are significant components of dust. Their accumulation in ventilation systems can lead to microbiological growth issues when there is moisture and excessive humidity.

Another essential factor influencing air quality is the functioning of ventilation systems. Damaged dampers, missing bird screens and clogged or inefficient drains can generate indoor air quality issues.

In this context, the preventive inspection of ventilation systems can identify deficiencies as well as future problems.

Applicable standards and guidelines

According to the regulations in effect, building managers and employers are responsible for offering building occupants an acceptable quality of air. Although no specific legal document requires the maintenance of ventilation systems, the regulations stipulate that they be inspected. The frequency of these inspections may vary according to federal or provincial legislation.

Though existing regulations describe neither the elements to inspect nor the criteria for cleanliness to apply as part of corrective measures, guidelines on the inspection of ventilation systems have been published by various organizations including:

  • Guide de prévention contre la prolifération microbienne dans les systèmes de ventilation, by the Institut de recherche Robert-Sauvé en santé et en sécurité du travail (IRSST)
  • Guide sur la qualité de l’air intérieur dans les établissements du réseau de la santé et des services sociaux, by the Corporation d’hébergement du Québec for the Ministère de la Santé et des Services sociaux
  • ACR 2006 – Assessment, Cleaning, and Restoration of HVAC Systems, by the National Air Duct Cleaners Association (NADCA)



Inspection methods

Le Groupe Gesfor offers different specialized methods for inspecting ventilation system components — outdoor air intakes, mixing plenum and filtration units, blowers, filtration units, coils, humidifiers, registers, silencers, ducts, etc. No matter the size of the ventilation ducts, our automated equipment allows us to visualise their interior condition with minimum access. In addition, using video capture software, we can identify and comment in our reports on each of the locations assessed to demonstrate the problematic and make recommendations. In certain cases, we use portable equipment fitted with a HEPA-filter vacuum system to protect the environment adequately from airborne dust and/or contaminants.

During inspections, our experienced multidisciplinary team collects all types of samples necessary to determine the nature of the contaminants present, and then interprets the laboratory analysis findings. The purpose of this assessment is to identify the source of the issue and make recommendations on how to correct the situation. Our team can also supply you with a preventive maintenance program.

Professional services

We can offer you the following services:

  • HVAC inspection
  • Sampling and analysis of contaminants
  • Preventive maintenance and inspection programs
  • Project management
  • Drafting of technical specifications sections and safe work procedures
  • Supervision of cleaning work



Our reports generally include a description of our mandate and methodology, the list of contaminants and the laboratory analysis findings, the reference documents and values, our recommendations, a photographic survey and annotated drawings identifying the location of each of our investigations.

2017 Le Groupe Gesfor Poirier, Pinchin inc. All rights reserved.