Steel Exit Door

Steel exit doors rarely get noticed until there's a reason to use them — but that's kind of the point. They're there to keep evacuation routes clear and stop fire from moving through a building while everything else is chaos.
The construction is straightforward but purposeful. A galvanized steel shell surrounds a mineral-based core that holds up under prolonged heat exposure. Fire integrity ratings can reach three hours, with insulation performance extending up to two hours — figures that matter when a building's compartmentalization plan is the only thing slowing a fire down.
Part of what draws contractors and facility managers to these doors is how much can be adjusted before anything ships. Common configuration requests include:
Single or double leaf openings to match the space
Glass panels in wired, ceramic, or laminated fire-resistant options
Air louvers fitted with intumescent seals for rooms that need ventilation
Panic bar hardware with optional alarm and fire system integration
Powder-coated finishes in grey, black, white, red, or custom colors
Hardware doesn't always get the attention it deserves, but the details here are worth a closer look. Panic bars take almost no force to push open — something that matters a lot when smoke is thick and people are rushing for the exit. Automatic door closers keep fire compartments sealed between uses without anyone having to think about it. The mineral core adds real weight, and the hinges have to match that. 
These doors show up in hospitals, schools, warehouses, airports, and office buildings for good reason. They're not complicated, but they're reliable — and in a fire scenario, reliable is exactly what you need.