Fire Rated Access Doors

Why a rated wall or ceiling needs a listed door

A fire rated wall or ceiling only holds its rating if everything cut into it is rated too. An unlisted door in a rated assembly is a failed inspection, and it is one of the more common reasons a service opening gets flagged during close-out.

Karp builds four fire rated models. The KRP-150FR is insulated and listed for walls and ceilings. The KRP-350FR is insulated, suits drywall surfaces and carries the same dual listing. The KRP-250FR and the KRP-450FR are non-insulated; the 250FR for walls, the 450FR for drywall in walls only. All four are flush-mounted with mounting holes in the frame, and masonry straps are included on all fire-rated applications.

UL and Warnock Hersey listings by model and location

Ratings are model-specific and location-specific, which matters more than it sounds. The KRP-150FR and the KRP-350FR are both listed by Underwriters Laboratories for a 1.5-hour "B" label in walls and by Warnock Hersey for 3 hours in ceilings, so the same door carries two different ratings depending on where it goes. The KRP-250FR and the KRP-450FR are listed by Underwriters Laboratories for a 1.5-hour "B" label in walls. Always read the listing for the model and the location, not a general category claim. Each product page links the spec sheet with the listing details.

Sizes, stainless steel options and lock hardware

The KRP-150FR runs 18 standard sizes from 8 x 8 through 48 x 48. Type 304 stainless steel is available where the door is exposed to weather or sits in a hygienic area such as a hospital, pharmaceutical plant, laboratory, or food processing facility, finished in a No. 4 satin finish. Hardware options include a RIM cylinder lock with night latch for keyed access from outside the door.

Doors are made in the USA, and standard sizes ship on a 72-hour turnaround. For a custom size in a rated assembly, contact the sales team before specifying - the listing governs what can be changed.