Bilco Type DSH Automatic Smoke Vent (Double Leaf): The Gold Standard for Roof Smoke Exhaust

Summary: The Bilco Type DSH automatic smoke vent (double leaf) provides rapid smoke and heat release for large-span buildings—improving life safety, firefighter access, and code compliance.

Why Smoke Vents Matter

During a fire, fast vertical exhaust of smoke and heat can preserve visibility for occupants and first responders while reducing flashover risk. Roof-mounted smoke vents enable buoyant smoke to exit the building, making evacuations safer and helping protect assets.

Meet the Bilco Type DSH

• Automatic mechanical release via fusible links—no external power required
• Double-leaf design maximizes vent area for rapid smoke and heat removal
• UL 793–listed performance and reliability
• Insulated covers and weather-tight gasketing for energy efficiency
• Heavy-duty construction in steel or aluminum with corrosion-resistant hardware
• Options: electric/pneumatic release, burglar bars, curb safety rails

Ideal Applications

• Warehouses and distribution centers
• Manufacturing facilities
• Retail centers, malls, and big-box stores
• Schools, gymnasiums, auditoriums, and convention halls

Installation & Maintenance

Type DSH mounts on flat or low-slope roofs and integrates with standard roofing systems using its built-in curb for reliable flashing. Routine checks of fusible links, gasketing, and hinges help ensure long-term performance.

Code Alignment

• NFPA 204 – Smoke and Heat Venting
• IBC 910 – Smoke and Heat Removal
• UL 793 – Automatically Operated Roof Vents

Always verify local requirements with your AHJ or fire marshal.

Type DSH vs. Alternatives

Compared with single-leaf designs, the double-leaf Bilco Type DSH smoke vent provides a larger free vent area and faster thermal/smoke release—ideal for high-bay buildings. Not sure if DSH is right for your project? Contact us for model comparisons, submittals, and lead times.

FAQs

How does the automatic release work?

A fusible link melts at its rated temperature, releasing spring-assisted covers to open without electricity.

Do I need power or sensors?

No. The standard unit is fully mechanical. Optional electrical/pneumatic releases can be specified.

What about weatherproofing and insulation?

DSH covers are insulated and gasketed to limit heat transfer and resist weather infiltration when closed.

Will it help with code compliance?

It supports compliance with NFPA 204 and IBC 910 where smoke and heat venting is required, and is UL 793–listed. Confirm project-specific requirements with your AHJ.

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