That dust is almost always dryer lint escaping before it reaches the outside vent. The usual culprits are a loose or unsealed duct joint behind the dryer, a crushed or torn flex hose, or a blocked outside vent forcing lint back out through every gap in the run. A dryer moves a large volume of air on every cycle, so even a small opening releases a steady stream of fine lint into the room.
The first thing worth saying: if one room in your house is noticeably dustier than the rest, and that room happens to contain a dryer, you are not looking at a housekeeping problem. You are looking at an exhaust problem.
Pick some of it up and roll it between your fingers. Household dust is gritty and grey — skin cells, soil, fabric fibres, and in Alberta a fair amount of fine outdoor soil. Dryer lint is soft, fibrous, and usually pale or tinted the colour of whatever you have been washing. If the dust on top of your washer looks like what you pull out of the lint trap, that is exactly what it is.
Your dryer pushes a substantial volume of hot, moist, lint-laden air through the duct on every cycle. That air is under pressure, and it will find any weakness in the run. These are the four we find most often, roughly in order.
You can narrow this down yourself before calling anyone.
Start a warm cycle with a decent load in the dryer, then run your hand slowly along the duct where you can reach it — the back of the dryer first, then the connection at the wall. Anywhere you feel warm air puffing against your palm is a leak. It is usually obvious the moment you find it.
Then go outside and put your hand in front of the exterior vent hood while the dryer runs. You should feel a strong, steady push of warm air. If it is weak, intermittent, or barely there, the run is restricted somewhere — and that back-pressure is what is driving lint out of the joints indoors. If the flap isn’t opening at all, stop using the dryer until it is cleared.
We clean and inspect the whole run — dryer to exterior hood — and reconnect or reseal anything that has come loose. Flat-rate, no pressure.
Loose lint on your shelves is annoying. What it indicates is genuinely worth acting on.
Lint escaping into the room means the vent is not moving air the way it should, and lint sitting inside a hot duct is the mechanism behind dryer fires. That is the serious end of it. Short of that, a restricted vent makes every load take longer and cost more to run, wears the appliance out faster, and keeps warm moist air indoors — which is why a dusty laundry room and a humid one so often turn out to be the same underlying fault.
There is an Alberta wrinkle too. Our winters are extremely dry, and in a low-humidity house fine lint stays airborne longer and travels further on static rather than settling near the dryer. If the dust seems to be turning up two rooms away, that is why — and if your furnace return happens to be in or near the laundry room, the system will happily distribute it through the rest of the house.
In most cases the answer is not sealing the joints — it is clearing the blockage that is putting the run under back-pressure in the first place. Once air moves freely again, it goes out the vent instead of out the seams.
A proper dryer vent cleaning clears the full run from the appliance to the exterior hood, and any joint that has genuinely worked loose or any flex hose that has been crushed gets reconnected or replaced while we are there. It is a flat $150 stand-alone, or $60 if you add it to a furnace or duct cleaning on the same visit.
If it turns out a bird has built in your vent — which in spring is a real possibility around here — that is its own situation, and there are rules in Alberta about how it has to be handled.