A hotel’s commercial laundry runs its dryers at a duty cycle no residential appliance approaches — continuously, at high heat, with heavy linen loads that shed enormous quantities of lint. The exhaust system serving them is a different discipline from apartment dryer vents, and a considerably larger fire risk.
The Volume Problem
A 200-room hotel processes hundreds of pounds of linen daily. Commercial dryers move far more air than domestic units and produce lint at a rate that loads a duct system in weeks, not years. Where an apartment vent might need annual attention, a hotel laundry exhaust system often requires quarterly or semi-annual cleaning depending on volume.
The duct runs are also longer and larger — commercial exhaust frequently travels considerable distance to a roof or exterior wall termination, with multiple dryers manifolding into shared trunk ducts. Lint accumulates at every junction and transition.
Make-Up Air — The Overlooked Half
Commercial dryers can only exhaust as much air as the room can supply. Laundries with inadequate make-up air run their dryers against negative room pressure: drying times extend, dryers overheat, and lint deposits more heavily in the duct because exhaust velocity drops. Many hotel laundries have never had their make-up air provision assessed against their dryer load.
The symptom operators notice is long dry times and rising energy costs. The cause is frequently an airflow problem, not an appliance problem.
Fire Risk in Context
Dryer fires account for approximately 92% of appliance fires in residential buildings, and failure to clean is the leading cause. In a hotel, the laundry is typically located adjacent to or below guest accommodation, and a lint fire in a trunk duct has a direct path through the building. The consequence profile — sleeping guests, unfamiliar egress, potential mass casualty — makes this among the highest-stakes exhaust systems in commercial property.
What Cleaning Involves
Commercial laundry exhaust cleaning requires equipment sized for the duct — rotary brush systems on larger diameters, high-volume negative air, and access to trunk runs that may pass through ceiling voids and roof spaces. Lint traps and transitions at each dryer are cleaned, the trunk duct is cleared along its length, and the termination is cleared and inspected. Airflow is verified at each dryer.
Documentation
Before and after photographs of each dryer connection, trunk duct sections, and the termination. Airflow readings per dryer. A deficiency log covering damaged duct, inadequate make-up air, non-compliant materials and missing access panels. And a dated completion certificate for the fire marshal, the insurance carrier and the brand standard audit.
Frequency
Volume-driven. A high-occupancy full-service hotel laundry frequently warrants quarterly cleaning. Limited-service properties with lower linen volumes may run semi-annually. Annual is rarely sufficient for a commercial laundry.