鈥淗ollow metal door鈥?and 鈥渇ire-rated steel door鈥?do not always describe two separate product families. Hollow metal generally refers to metal door and frame construction, while fire rated describes performance required for a specific opening under a referenced standard. A hollow metal assembly may be supplied for a non-rated opening or configured for a rated opening when the required evidence and compatible components are available.
When hollow metal construction is considered
Metal doors are commonly reviewed for commercial service areas, corridors, stairs, plant rooms, warehouses and back-of-house openings. Buyers compare leaf construction, core, frame profile, hardware preparation, finish and exposure. The correct configuration depends on traffic, security, environment and project specification.
What makes an opening fire rated
A rated opening is coordinated as an assembly that can include the leaf, frame, glazing, louvers, seals and hardware. The project should identify the test standard, rating duration, label and document requirements. A steel skin by itself does not demonstrate the required fire performance.
Questions that determine the correct specification
- Is the opening rated or non-rated, and under which standard?
- What wall construction and frame profile are required?
- Is the opening interior, exterior or exposed to corrosion?
- What traffic, security or impact conditions apply?
- Are vision panels, louvers or special seals included?
- Which hinges, locks, closers and exit devices are required?
- What labels, reports and submittals must be supplied?
Compare complete door sets
When reviewing quotations, compare the same leaf, frame, finish, hardware preparation, glazing and documentation scope. One offer may include only the leaf while another includes a coordinated rated assembly. Ask every supplier to list inclusions, exclusions and assumptions by door mark.
Environment and finish
Interior conditioned spaces, exterior openings, wet service areas and coastal projects can require different material and coating decisions. State the exposure and cleaning requirements instead of using one generic finish across the schedule.
Prepare the schedule before ordering
Group openings by construction and performance. Include size, handing, wall type, rating, frame, hardware set and finish. Mark unknown information for clarification before production drawings are approved.
Explore hollow metal doors, fire-rated steel doors and the fire door standards guide. Describe the required openings through the quotation form.