Hollow Metal Doors
Hollow metal doors, also known as commercial steel doors, are produced from a single sheet of roll form steel, welded steel channels and non-metal core material. Hollow metal doors are recommended for interior, exterior, commercial, industrial and fire-rated door openings.
Commercial Steel Door Types
HM Door - F
Hollow Metal Door – Flush Commercial Steel Door
HM Door - N
Hollow Metal Door With Rectangular Vision Lite & Glass
HM Door - V
Hollow Metal Door With Small Square Vision Lite & Glass
HM Door - HG
Hollow Metal Door With Half Glass Window Kit
HM Door - HG/S9
Hollow Metal Door With Half Glass Window Kit & Wide Stiles
HM Door - FG
Hollow Metal Door With Full Glass Window Kit
HM Door - FG/S9
Hollow Metal Door With Full Glass Window Kit & Wide Stile
HM Door - GG
Hollow Metal Door With Glass-Over-Glass Window Kits
HM Door - NLB
Hollow Metal Door With Rectangular Glass & Louver Below
HM Door - HGLB
Hollow Metal Door With Half Glass & Louver Below
HM Door - LB
Hollow Metal Door With Vented Louver At Bottom Of Door
HM Door - LB2
Hollow Metal Door With Large Louver At Bottom Of Door
HM Door - LT
Hollow Metal Door With Vented Louver At Top of Door
HM Door - LL
Hollow Metal Door With Louvers At Top & Bottom of Door
HM Door - LF
Hollow Metal Door With Full Louver For Maximum Air Flow
Hollow metal doors, also known as commercial steel doors, are produced from a single sheet of roll form steel, welded steel channels and non-metal core material. Hollow metal doors are recommended for interior, exterior, commercial, industrial and fire-rated door openings.
Commercial Steel Door Performance Level
Standard for Most Commercial Doors
Level 2 | 18ga.
18 gauge steel doors are classified as physical performance level 2 for heavy-duty commercial durability.
Level 3 | 16ga.
16 gauge steel doors are classified as physical performance level 3 for extra heavy-duty commercial durability.
Level 4 | 14ga.
14 gauge steel doors are classified as physical performance level 4 for maximum commercial durability.
Materials & Finishes
Standard for Most Commercial Doors
Cold Rolled Steel | Prime Coat
Cold rolled steel is made by adding tensile force to hot rolled steel sheets. The cold-rolling process increases density, hardens the steel, and produces a consistent surface that’s ideal for commercial doors and frames.
Standard for Most Commercial Doors
Galvanneal | Prime Coat
Galvanneal steel is produced when cold-rolled steel is dipped into liquified zinc then heated until a new zinc-iron alloy is created. Galveanneal steel doors are known for their improved corrosion resistance and superior paint adhesion properties.
Galvanized | Prime Coat
Galvanized steel is produced when cold rolled steel is dipped in a hot zinc coating. Galvanized steel doors are resistant to corrosion but offer poor paint adhesion compared to annealed steel doors.
Commercial Steel Door Models
Standard for Most Commercial Doors
Model 1 | Full Flush
Full flush commercial metal doors are formed with a visible seam at the door edge.
Model 2 | Seamless
Seamless edge steel doors have filled, finished, and prime-coated vertical edges.
Hollow Metal Door Cores
Standard for Most Commercial Doors
Polystyrene
Polystyrene provides a hollow metal door with rigidity, resistance to dents and insulating properties.
Standard for Most Commercial Doors
Honeycomb
Resin-hardened honeycomb core stabilizes a hollow metal door and provides resistance to impact and dents.
Steel Stiffened
Steel stiffened doors have steel reinforcements welded inside the door cavity. Insulation is used to fill any air space.
Temp Rise
Temperature rise doors have a mineral composite core that reduces heat transfer to the non-fire side of a door.
Urethane
Polyurethane foam is expanded inside the cavity of a hollow metal door to improve insulating values.
Specialty Door Cores
STC or acoustical doors are used in studios, theaters and applications where audible noise is a concern.
Lead lined doors resist the transfer of radiation in medical, energy and aerospace facilities.
Ballistic doors are designed for use in areas where a firearm is likely to be discharged.
Blast doors are designed to protect building occupants and property during an explosion.
Recommended Use
References & Options
SDI/ANSI: SDI-100-91/ANSI 250.8-03 | SDI-105-98/ANSI A250.11-01 | SDI-107-84/ANSI A250.6-03
SDI-108-10 Recommended Selection and Usage Guide for Standard Steel Doors
SDI-112-08 Zinc-Coated (Galvanized/Galvannealed) Standard Steel Doors and Frames
SDI-118-05 Basic Fire Door Requirements
ANSI/SDI A250.13-2008 (R2018) Testing and Rating of Severe Windstorm Resistant Components for Swinging Door Assemblies for Protection of Building Envelopes
Intertek/Warnock Hersey Fire Door Test Methods
Neutral Pressure: CAN/ULC S104 | NFPA 252 | UBC7-2 (1994) | UL 10B
Positive Pressure: NFPA 252 | UBC 7-2 Part 1 (1997) | UL 10C
International Standards: BS 476 | EN 1634-1 | ISO 3008
Non-Fire Rated Openings: Hollow metal doors are frequently used in non-fire rated commercial door openings.
20 MIN: 20 minute fire rated doors are used in 1-hour walls where smoke and draft control is a concern.
45 MIN: 45 minute fire rated doors are used in 1-hour corridors, room partition walls, or exterior walls that may be subject to moderate fire.
60 MIN: 60-minute fire rated doors are used in 1-hour walls that divide occupancies in buildings.
90 MIN: 90-minute fire rated doors are required in two-hour walls, stairwells, elevator shafts, boiler rooms and exterior areas with severe fire risk.
3 HR / 180 MIN: 180 minute, or 3-hour, fire rated doors are required in 4-hour walls that separate a large building, or multiple buildings into designated fire areas.
Interior Metal Doors: Hollow metal doors are frequently used at interior commercial door openings.
Exterior Metal Doors: Hollow metal doors are designed for exterior use in commercial buildings.
Metal Security Doors: Hollow metal doors can help to secure people and property.
Metal Doors with Windows: Commercial metal doors are compatible with most vision lites and door window-kits.
Metal Double Doors: Hollow metal doors can be hung as single doors or paired in double door assemblies.
Commercial Doors: Hollow metal doors are built for heavy-duty commercial and industrial door applications.
TDI – Inland Zone 2: Texas Department of Insurance approved hurricane doors are required in exterior door openings within zone two of the designated coastal region.
TDI – Inland Zone 1: Texas Department of Insurance approved hurricane doors are required in exterior door openings within zone one of the designated coastal region.
TDI – Seaward Zone: Texas Department of Insurance approved hurricane doors are required in exterior door openings within the designated seaward intracoastal zone.
Florida Building Code: Florida approved hurricane doors are required in exterior door openings within the state of Florida. (Insufficient for properties in Miami-Dade County)
Miami-Dade County, FL: Miami-Dade approved hurricane doors are required in exterior applications within the county of Miami-Dade, FL.
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