37.5″ x 81.75″ 20-Minute Fire-Rated Solid-Core Interior Door, LH, Primed, 4-9/16″ FJ Jamb

This prehung, left-hand inswing interior door features a 1-3/4″ solid core with a 20-minute fire rating for added safety in residential or light commercial spaces. The primed flat slab arrives paint-ready and mounted in a 4-9/16″ finger-jointed jamb with a 37.5″ x 81.75″ net frame for a straightforward install and a clean, modern look and often supplied pre-bored (DB) for handle + deadbolt hardware to speed onsite setup.

Why choose this fire-rated prehung door?
A verified 20-minute label supports code compliance at key locations, while the solid-core build helps reduce sound and improve durability. The paint-ready prime finish streamlines finishing, and the 4-9/16″ jamb fits common wall depths for an easier retrofit or new install.

• Brand: Mad Dog Doors
• Category: 20 Minute Fire Rated
• Handing: Left Hand In Swing
• Height: 81.75 Inches
• Width: 37.5 Inches