Mills & Nebraska Architectural Products

    FramesSince 1933

    Knock-Down Frames

    Mills & Nebraska supplies knock-down hollow metal door frames that ship in pieces and assemble on site, a practical choice for Florida renovations, tenant improvements and occupied buildings.

    • Fire 20 min to 3 hr
    • Field Assembled
    • Delivery by our own fleet across Florida
    • Orlando & Lakeland, FL
    Knock-Down Frames supplied by Mills & Nebraska

    Overview

    About Knock-Down Frames

    A knock-down (KD) frame is a hollow metal door frame that ships unassembled and is put together in the field, typically wrapping a finished wall opening. Because the pieces are compact, knock-down frames move easily through corridors and elevators in occupied buildings, such as high-rises and existing office buildings.

    Knock-down frames suit renovation and tenant improvement work where a welded frame cannot be set with the wall, and they adapt to existing wall thicknesses and conditions, from historic downtown buildings to condo renovations.

    How to choose

    Choose knock-down frames when access is limited or walls are already finished, such as renovating an office tower or updating a hospital wing. Confirm the wall thickness (jamb depth), fire rating and hardware preps before ordering.

    In Florida
    Well suited to Central Florida renovation and tenant improvement work, and shipped from Orlando.

    Features

    What's included

    • Standard & custom sizes
    • Drywall or masonry configurations
    • Adjustable for existing wall conditions

    Ratings

    Ratings and approvals

    Fire rating

    20 min to 3 hr, per listing

    Renovations and tenant improvements

    See fire-rated doors & frames

    Standards, testing and code

    • SDI
    • UL 10C
    • NFPA 80
    • Florida Building Code, 8th Edition (2023)
    • Florida Fire Prevention Code

    Applications

    Where it's used

    Brands we provide for knock-down frames

    • Curries
    • Timely Industries
    • Redi Frames logo

    FAQs

    Knock-Down Frames FAQs

    Have a question about a specific opening? Call (866) 304-DOOR (3667)

    When should I use knock-down frames instead of welded frames?

    Use knock-down frames for renovations and tenant improvements where walls are already built or access is tight. Use welded frames for new construction and heavy-use doors, since welded frames are more rigid. Knock-down frames can carry fire labels up to 3 hours where the manufacturer's listing covers the frame, wall type and anchors.

    How are knock-down frames installed?

    Knock-down frames are assembled on site without welding. The head and jambs are joined at the corners, fitted around the wall opening, then anchored and adjusted for plumb and square before the door is hung.

    Get a quote for knock-down frames

    Send us your drawings or door schedule. Our team responds within 24 business hours with lead times, submittals and Florida code requirements for your openings.