2 TYPES HOLLOW METAL DOOR FRAME

Masonry knock down frames (KD FRAME) can be installed on the following wall construction types:

Exterior brick Wall

Exterior block Wall

Exterior CMU Wall

Exterior Wood Stud Wall

Exterior Metal Stud Wall

Dry Wall Frame

There is a drywall frame which is always shipped disassembled or "knocked down" in three pieces. Drywall frames are interior door frames and designed with compression anchors. They work by wrapping around the building wall. The frame wraps around the drywall, and compression anchors are adjusted to hold the door frame in place. The most important factor to understand here, is that a drywall frame wraps the wall. This is important for determining the door's rough opening. The formula below shows how to calculate the rough opening for a drywall frame using actual door size.