The KRP-350 FR is insulated and rated by Underwriters Laboratories for 1.5 hours "B" label in walls, and may be used in a 2 hour fire rated wall assembly. Additionally, Warnock Hersey rates the KRP-350FR for 3 hours in ceilings.
The KRP-350FR has a textured frame and bead so drywall joint compound can be
applied in sufficient thickness to conceal the flange.
** Not for ceiling applications
Doors larger than or equal to 36" are subject to oversize or LTL shipping charges.