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Ductwork is the only system in a house that touches every room at once. Whatever settles inside it — construction dust, pet hair, spores, renovation residue — gets redistributed every time the furnace starts. In Montreal, where much of the housing stock is over fifty years old and many duct systems have never been opened since installation, this is usually the first thing to address before considering an air purifier.
In short
Air duct cleaning removes the dust, debris and allergens that accumulate inside a building’s forced-air system. At Nettoyage Service Plus the job follows four steps: a 4,000 CFM collector is connected to the main trunk to put the duct system under negative pressure, 200 PSI compressed air dislodges deposits in every supply and return, the main trunks are mechanically brushed, then an antibacterial sanitizer is applied. For a single-family home in Greater Montreal the visit usually takes two to three hours.
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A 4,000 CFM dust collector is connected directly to the main trunk line. Everything dislodged during the job travels into the machine, not into your living room. This is what separates a real cleaning from a vacuum run over the grilles.
Every floor register and every return grille gets a compressed-air jet that lifts deposits all the way to the back of the branch. Nothing is skipped: the number of outlets is counted at the start and checked at the end.
The main trunks, where dust compacts the most, are mechanically brushed. This is the step the NADCA standard requires and the one discount offers almost always skip.
An antibacterial product is applied under pressure through the ductwork. It is safe for occupants and pets once the job is done; an unscented version is available on request for sensitive individuals.
Two to three hours for a typical single-family home in Greater Montreal. A plex, a large bungalow with a finished basement, or a heavily loaded system can take half a day. The time quoted on the phone accounts for the number of outlets, which we ask you to estimate when we quote.
No — that is exactly what the 4,000 CFM collector is for. The duct system is put under negative pressure before anything is touched, so dislodged dust travels into the machine. Floors and walkways are protected as soon as we arrive.
NADCA, the body that sets the industry standard, recommends inspection every two years and cleaning when condition warrants. For a home without pets or recent work, that usually comes to every 3 to 5 years. With pets, allergies, a smoker or renovations, the interval tightens.
Yes. Many Montreal condos have an air exchanger rather than a full forced-air system — in that case we clean the exchanger and its outlets. In a plex each unit has its own system and is quoted separately; units in the same building can be grouped into a single visit.
Someone has to let us in and show us the furnace and the vents. After that you do not have to stay in the room. We do need access to every outlet: clearing anything blocking a floor register before we arrive saves everyone time.
Why don’t we post prices? Because the cost depends on the number of vents, the size of the home, the system’s actual condition and access. All questions →
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We provide air duct cleaning across Greater Montreal. Pick your city for what changes locally.
An air exchanger (HRV or ERV) renews the air in an airtight home by expelling stale air while recovering heat from it.
Dryer vent cleaning removes the lint built up along the entire duct, from the connection behind the appliance to the exterior damper.
Cleaning a wall-mounted heat pump (mini-split) means partially dismantling it to wash what simply dusting the filters never reaches: the exchange coil, the blower wheel, the condensate pan and the drain line.