Double Leaf Automatic Smoke Vent Model

Type DSH

Standard Features and Benefits

• Thermolatch® II positive hold/release mechanism ensures reliable vent operation when a fire occurs.
• Automatically releases vent covers upon the melting of a UL-listed 165°F (74°C) fusible link.
• The curb-mounted fusible link housing allows the latch to be quickly and easily reset from the roof level.
• Our double leaf automatic smoke vent is engineered with powerful gas spring operators to open covers in snow and wind conditions
• Gas springs have integral dampers to assure the covers open at a controlled rate
• Fully insulated and gasketed for weather-tightness
• Constructed with corrosion resistant materials to provide many years of trouble free, dependable service
• Available in a number of standard UL listed sizes

Guide Specifications

• Material (select one):
  • Steel: Cover and frame are 14 gauge (2 mm) galvannealed steel.
  • Aluminum: Cover and frame are 11 gauge (2.3 mm) aluminum
• Covers: Brakeformed, hollow-metal design with 1" (25 mm) concealed fiberglass insulation, 3" (76mm) beaded, overlapping flange, fully welded at corners, and internally reinforced for 40 psf (195 kg/m2) live load.
• Curb: 12" (305mm) in height with integral capflashing, 1" (25 mm) fiberboard insulation, fully welded at corners, and 3-1/2" (89mm) mounting flange with 7/16" holes (11mm) provided for securing frame to the roof deck.
• Gasket: Extruded EPDM rubber gasket permanently adhered to the curb.
• Hinges: Heavy-duty pintle hinges with 3/8" (9 mm) type 316 stainless steel hinge pins.
• Latch: Positive hold/release mechanism controlled by a single UL-listed 165°F (74°C) fusible link with a separate latching point for each cover. Designed to hold the covers closed against a 90 psf (438kg/m2) wind uplift force. Provided with interior and exterior pull release cables to manually open vent covers.
• Operation: When released, high performance gas springs on the double leaf automatic smoke vent open covers against a 10 psf (49kg/m2) snow/wind load and lock covers in the open position. Gas springs have integral dampers to assure a controlled rate of cover opening and have a cyclic durability of 50,000 cycles.
• Performance Ratings: UL-listed. Comply with UL 793 and UL 790 Class A (burning brand test).
• Finish: 
  • Steel: Alkyd base red oxide primer. 
  • Aluminum: Mill Finish
• Hardware: Gas springs have a powder coated outer tube and chromate plated inner rod. All other hardware is zinc plated/chromate sealed or galvanized steel

U.S. Patents  5,927,012  5,960,596  6,347,818

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CA Prop 65 Notice

WARNING : The State of California has deemed that this product can cause cancer, birth defects or other harmful effects. For more information, please visit For more information, Please visit: www.p65warnings.ca.gov/

Automatic Smoke Vents - Protecting Life & Property

Automatic smoke vents aide fire fighting efforts and promote safe building evacuation by removing heat, smoke, and toxic fumes from a burning building. Watch our short video on the theory behind automatic smoke ventilation and learn how to protect your property and its contents.