Hollow Metal Doors & Frames
Commercial-grade steel doors and frames engineered for performance, fire safety, and fast delivery. One source — every specification.
Why Imperial Door & Frame
Precision-built hollow metal doors and frames — stocked in our Charlotte warehouse and shipped within 1–2 business days.
- CNC flexible manufacturing
- Automatic Painting Line
- Digital Bending & Punching
- Robotic Welding
- Bespoke Size & Design Freedom
- Fabrication Stability & Quality
Products Overview
Hollow Metal Doors
16 & 18 gauge galvanized steel (A40/G90)
Polystyrene core standard; honeycomb, stiffener, fiber available
Seamless / interlocking welded construction
3-hour WHI fire rating — UL 10C / NFPA 252
Universal hardware reinforcements (7-ga hinge, 14-ga lock)
Prime painted with baked-on resin finish
Stainless steel optional
Max size: 4′-0″ W × 8′-0″ H
Stocking Hinge Locations
Steelcraft (SC)
Curries (CU)
Mesker (ME)
Pioneer (PI)
Ceco (CE)
Hollow Metal Frames
12/14/16-gauge galvanized A40 steel — break-formed to spec
KD (knock-down) or factory welded (laser face welded available)
Masonry & drywall configurations
Single or double rabbet
Jamb depth: 4″ to 14″ — heights 3′-0″ to 14′-0″
2″ / 4″ / 6″ headers with 2″ face
Compression anchors (drywall) / MSA-MWA wire anchors (masonry)
Mitered corners with 4-tab interlocking system
Countersunk hole drywall anchors, welded sill anchors
7-ga hinge reinf., 14-ga lock reinf., closer reinf. both sides
18-ga reversible hinge shim, 20-ga dust cover
Inverted bottom channel with 3/4″ weep holes
Custom Fabrication & Components
Beyond standard sizes, Imperial manufactures custom doors and frames to your exact specifications. Welded frames, specialty preps, and factory-installed components — ready to ship.
Custom Size Doors & Frames
Any profile, any dimension within manufacturing range.
Welded Frames
Laser face welded and continuous welded — ground smooth.
Steel Louvers
18-ga blade thickness. Inside/outside mounting. Order size = cutout minus 5/32″.
Vision Lite Kits
Tempered glass kits with inside/outside frames. Visible lite = overall size minus 2″.
Edge & Channel Components
Lock seam edge, inverted bottom channels, adjustable screws, reversible hinge shims.
Reinforcements
7-ga hinge (4-1/2″ or 4″), 14-ga lock, closer reinf. both sides, blank brackets.
Some items are special order only — contact us for availability and lead times.
Fabrication & Technology
Advanced CNC manufacturing, robotic welding, and automatic finishing systems deliver consistent quality and design freedom across every product.
Guillotine Shearing
Precision sheet cutting for consistent panel sizing
CNC Punch
Computer-controlled punching for accurate hardware prep and cutouts.
Automatic Panel Bender
Digital bending for fabrication stability, consistent angles, and quality.
Embossing
Surface texturing and profile creation for aesthetic and structural enhancement.
Laser Welding
Seamless face-welded and continuous-welded construction for structural integrity.
Laser Cutting
Precision cutting for bespoke sizes, custom profiles, and design freedom.
CNC Press Brake
Digital bending and forming for frame profiles and custom components.
Powder Coating & Painting Line
Automatic factory-applied finish. Water-based, oil-based, or powder coat in all RAL colors.
Handing, Finishes & Certifications
Door Handing Configurations
Single Doors
RH (Right Hand) and LH (Left Hand) configurations with lock and strike jamb identification from hinge side.
Double Doors (Pairs)
Equal and unequal pairs with RHRB and LHRB active leaf designations and inactive leaf identification.
Double Egress
Opposing-swing door pairs for corridor and egress path applications where code requires traffic flow in both directions.
Communicating Openings
Side-by-side door configurations with RH and LH astragal designations for connecting rooms.
Performance & Finishes
Water-based or oil-based color painting
Color powder coating available
Durable, flow-coated, baked-on finish
Primer paint, full finish paint, or powder coat
All RAL color charts supported
Custom color matching upon request
Fire Rating & Certification
3-hour fire rated (WHI) — positive pressure
Certified to NFPA 252 and UL 10C
Intertek WH US + C Mark — Category A (Doors)
Category C — Proprietary Frames
Smoke and draft control rating with listed gasket
All frame components comply with ANSI A250.8 (R2008)
Fire labeling by WHI (Intertek)
Installation per ANSI A250.11 – 2001
