Fire Door Frames, Linings & Casings

The Frame That Makes a Fire Door a Fire Doorset

A fire door only earns its rating as part of a complete doorset, and the frame is where that begins. A fire door frame or lining is engineered to hold the door squarely, house the intumescent seals that swell to close the gaps as temperatures rise, and resist fire for as long as the door it carries, so the whole assembly performs the way it was tested to. Hang a fire door in an ordinary frame and you lose much of the protection you paid for.

These frames, linings and casings are made to suit standard fire door openings across both 30-minute and 60-minute ratings, in finishes chosen to match the doors they carry, from paint-ready white primed to real oak and walnut veneer. They're one part of the wider set of fire door hardware that turns a door blank into a compliant, working installation.

What makes a fire-rated frame different

A fire-rated frame or lining is built from timber of the correct species and thickness to hold its shape and resist fire, with a groove that carries the intumescent seal around the door. That seal is what closes the smoke and flame path once a fire takes hold, which is why a standard lining can't stand in for a rated one. Some of our frames arrive with the seals already fitted; where they don't, you'll find the right ones among our intumescent strips and seals.

Frames, linings and finishes to choose from

A full frame set gives you the complete surround, while a lining set suits an opening that already has its structural frame; check the product to see which each one is. On finish, white primed frames arrive ready to paint to your scheme, while oak and walnut veneer frames are made to sit alongside the matching internal fire doors so the timber runs consistently from door to frame. As with the doors, the veneer is real wood over an engineered core rather than solid timber, which keeps the frame straight and stable.

Completing the doorset

With the frame chosen, a set of fire-rated hinges and, where the opening calls for one, a compliant closer finish the assembly. Frames and linings come sized to the common door heights and widths gathered on the fire door sizes page, and it's worth having them fitted by a competent installer, since a fire doorset only performs when every part is fitted correctly.