Standards and certifications ensure duct cleaners perform high-quality work, and in Canada these standards include several procedures.

Dirty air ducts pose a number of health and safety risks for homeowners. As dust, mold, bacteria, and other contaminants accumulate in ductwork over time, they can spread throughout the home when the HVAC system circulates the air. This exposes occupants to airborne allergens, particles, and chemicals linked to respiratory issues like asthma and allergies. The degraded air filtration of dirty ducts further decreases indoor air quality, filling the home with more contaminants. Standards and certifications ensure duct cleaners perform high-quality work.

National Standards

The National Air Duct Cleaners Association (NADCA) establishes air duct cleaning standards in Canada. Notably, NADCA specifies:

Cleaning Methods

NADCA provides guidelines on proper cleaning methods including mechanical brushing, high efficiency particulate air (HEPA) vacuuming, and pressure washing. Certified companies follow these procedures.

Contaminant Removal

Standards address removing particles, dust, mold, bacteria, and allergens from ductwork. NADCA specifies minimum contaminant reduction targets duct cleaners must achieve.

Documentation Requirements

Cleaning contractors must document the pre-cleaning condition of ducts, methods and equipment used, and post-cleaning inspection. Photos and reports confirm the work met standards.


Seeking companies certified by NADCA or the Indoor Air Quality Association (IAQA) ensures the duct cleaning will meet high requirements. Certified cleaners have:

Undergone Training

Employees are trained on NADCA standards for procedures, safety, contaminant removal and more.

Passed Inspections

Cleaners must pass inspections to earn certification, demonstrating they follow all standards for equipment, PPE, and work methods.

Ongoing Requirements

Certified duct cleaners must meet continuing education and re-inspection requirements to maintain their status.

In summary, air duct cleaning standards specify how work should be performed to thoroughly clean ductwork and remove contaminants. Certification programs provide assurance that a company understands and follows proper procedures. Hiring a certified duct cleaner can help ensure you get a quality cleaning that improves your home’s air quality.

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