36 x 84 Commercial Hollow Metal Doors

The rough opening for a 36-inch steel door varies by configuration, frame profile, and wall construction. Specific rough opening dimensions depend on whether you are installing standard cut-and-notch, welded, or knock-down frames into drywall or masonry assemblies. Consult architectural framing details or contact our engineering team with your frame specifications for precise rough opening recommendations.

Our commercial hollow metal doors are available in gauges ranging from 18 gauge to 12 gauge. Lighter 18-gauge doors suit standard commercial applications, while heavier 14-gauge and 12-gauge doors provide maximum impact resistance and durability for high-abuse environments, industrial facilities, and heavy-duty institutional service.

We offer multiple core options to match specific structural and thermal requirements. These include polystyrene cores for dependable insulation, polyurethane cores for enhanced thermal performance, steel-stiffened cores for superior impact resistance, and specialized temperature rise cores designed for UL fire-rated life safety openings.

Yes, our commercial hollow metal doors are available with UL fire-rated certification and comply with NAAMM/HMMA standards. UL-labeled assemblies help contain fire, smoke, and heat transfer in commercial building egress routes, stairwells, and barrier separations according to specified architectural and life safety requirements.

Our hollow metal doors are manufactured using durable A60 galvannealed steel or corrosion-resistant stainless steel. A60 galvannealed material provides excellent paint adhesion and rust resistance for interior or exterior commercial use, while stainless steel delivers outstanding durability in demanding, moisture-prone, or sanitary commercial settings.

Standard door production lead times are 7 to 10 business days. For urgent project demands and schedule corrections, quick-ship programs are available with lead times ranging from same-day or 1 business day for select configurations up to 5 business days, backed by a dedicated delivery fleet.