Pat arrived at the laundry room to find a new dryer, a basket of damp towels and an owner ready to blame the new dryer. He looked at the ceiling. "Same exhaust route?" The machine had changed; the concealed duct and roof cap had not. Before anyone ordered a third appliance, we needed the whole exhaust path checked.
A dryer can exhaust through the roof when the appliance, duct route and terminal permit it. Maintenance has to reach the roof terminal as well as the machine. Lint does not stop at the ceiling just because the cleaning brush does.
Book a service that covers the dryer connection, the full exhaust duct and the roof terminal. Confirm roof access before the visit. Some appliance technicians and vent cleaners work only from indoors; a roofer may handle the cap and flashing without cleaning the concealed duct. Someone needs to own the complete check.
A new dryer can inherit an old restriction
Longer drying times can come from a restricted exhaust, so replacing the machine does not necessarily solve them. Whirlpool's venting checks identify crushed duct, lint accumulation and obstructed exterior outlets among the things to investigate. Clean the lint screen as the appliance instructions require, but do not mistake that routine for duct maintenance.
A roof route may run sideways before turning upward. Its acceptability depends on more than the straight-line distance between the laundry room and the roof. The Whirlpool installation manual has different vent-length allowances for different configurations and models. It also specifies metal venting and prohibits fasteners projecting into the duct where lint can catch. Use the manual for the actual dryer, including its treatment of elbows and termination type, rather than borrowing a maximum length from another model.
If the dryer becomes unusually hot, produces a burning smell or repeatedly stops, stop using it and arrange service. Repeated longer cycles are not a way to clear an obstruction.
The cap must be suitable for lint
Upstairs, Dave's first question was whether the cap belonged on a dryer route at all. A bathroom hood can look reassuringly similar. "Nice little screen," Pat said, looking at the product information. "Wrong place to collect a sweater." Small openings can catch lint and restrict discharge. We wanted the model identified before anybody removed or added parts.
GAF's Canadian bath and dryer terminal page gives a useful concrete example: its bird/pest screen and reducer must not be used for dryer service. That is a product-specific instruction, not permission to modify any hood. Have the installed terminal identified and checked against its own instructions and the dryer requirements. Adding mesh to solve a nesting problem can create a different hazard.
The roof visit should also check that the damper moves, the connection below is intact and the flashing remains sound. A clean cap attached to a disconnected duct still sends exhaust into the attic.
Follow the lint all the way outside
A complete service checks each part of the exhaust path, including the terminal above the roof.
Dryer connection
Check the transition for crushing and confirm the appliance's installation requirements.
Concealed route
Trace duct material, length, turns, joints and access for cleaning.
Roof terminal
Confirm dryer suitability, clear the outlet and check damper movement.
Operating check
Reconnect correctly and verify exhaust performance after the work.
Follow the lint route all the way out
The handover needed more than a photograph of lint beside the dryer. We wanted the route, the cleaned sections and any inaccessible part identified. A pile on the laundry floor proves lint came out; it cannot show whether a screen at the roof still blocks the discharge. That distinction kept the roof visit on the list.
If access limitations prevent a complete inspection, arrange the remaining work rather than accepting an unexplained "all clear." The next service interval should follow the appliance guidance and what the technician found, with earlier attention if drying performance changes. For a cap being replaced during reroofing, our vent-reuse guide explains why its function needs identifying before the old one disappears.
Back at the laundry room, the useful handover was a route and a scope: who checked the machine connection, who cleaned the duct, and who inspected the cap. The damp towels could wait. An unexplained gap between two contractors' visits could not be called a completed service.
