That round hood on the roof is the outdoor end of the dryer line. Cleaning it means the pipe from the back of the dryer, through the attic if the laundry is upstairs, and out the cap. Fine lint slips past the screen in the dryer and coats that whole pipe. A flap that only twitches when the dryer is running is telling you that hot air is barely getting through.
A dryer vent cleaning visit includes disconnecting the dryer, working the full length of pipe with a brush and a vacuum so all the lint comes out, and finishes by cleaning the outside cap. Our crew brings a ladder for the roof and shows you on camera that the exit is clear.
If the laundry is upstairs, that exhaust pipe usually runs through a hot attic before it reaches the roof cap.
Stay off the tile — let a professional do that work
An exterior wall hood you can reach from a stable ladder is the one you can probably clean yourself: take the hood off, pull the packed lint, free the flap, and put it back so it still opens. Without the right tools, though, you won't clear the full length of the vent run.
Do not climb a concrete-tile or steep hip roof to do it yourself — a slipped tile leaks long after the lint is gone. That roof is exactly why a cleaning company goes up top and works both ends of the pipe with extraction. Call a professional team.
And do not shove a shop-vac or a leaf blower up the hood. You can pack a clog tighter or blow lint into a wall bay.
Birds nest in an open cap
An open or damaged cap makes a warm nest, and birds and insects will use it. If you can see sticks in the flap from the yard, there's probably a nest in the line — that needs clearing, and then a guard on the cap so it isn't rebuilt. A cracked or missing cap is a repair-and-replacement job, not just a cleaning one.
TOP 1 does dryer vent cleaning in Orlando and across Orange County. Book a slot that fits your schedule.