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Discover expert architectural guides, fire-rated access door standards, and installation tips from the industry leader.
How to choose a drywall ceiling access panel: flush, recessed, all-drywall or concealed hatch, plus grid, plaster and fire rated ceilings by Karp model.
Duct access door sizes from 6 x 6 to 24 x 24, the 1 1/4 inch opening rule, hinged vs removable, and where to put the door at dampers and coils.
When a fire rated access door is required, what the UL and Warnock Hersey listings cover, B labels explained, and the seven things that void a rating.
Roof access hatch sizes from 24 x 36 to 30 x 96, galvanized against aluminum by weight, plus how to size one from the equipment schedule and what leaks.
Standard access panel sizes from 6 x 6 to 72 x 48 inches by application, and how to tell a nominal size from the wall opening dimension before you cut.
