Why roof exits need a different assessment
The technician may need to account for roof access, vertical run length, cap condition, weather exposure and whether the termination can be serviced safely.
Nesting and exterior-cap problems
Bird or pest debris, a damaged hood or a termination that does not open freely can restrict airflow even when the lower duct has been cleaned.
Long runs can expose routing weaknesses
Recurring buildup in a roof-exit system may justify a review of bends, length, concealed duct condition and whether the current route can be improved.
Service note: The assigned provider confirms the actual cause, access, scope, price and schedule before work begins.