TinnerFlow™Fire/Smoke Dampers, Rated Assemblies & AccessVERIFYField judgment
Choose the access-door style based on pressure, insulation, opening size, service frequency, clearance, and the device that must be reached.
Do not install a door that technically fits the duct but cannot open, unlatch, or provide enough working access after nearby trades finish.
The wrong door becomes a permanent service problem and often leaks or gets abandoned behind ceilings.
Verify against: project access detail/specification, door manufacturer data, equipment/damper instructions, foreman direction.