Automatic Smoke Vent Models

Type S-50SVTB, SS-50SVTB, DSH-TB

Standard Features and Benefits

• Thermolatch® 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.
• Engineered with powerful lifting mechanisms to open the covers in snow and wind conditions
• Heavy duty shock absorbers assure smooth opening and eliminate the possibility of operational, roofing or structural damage
• Fully insulated and gasketed for weather-tightness
• Constructed with corrosion resistant materials to provide many years of trouble free, dependable service

Guide Specifications

• Material: Cover(s) and frame are 11 gauge (2.3 mm) aluminum.
• Cover(s): Brakeformed, hollow-metal design with 3" (75 mm) concealed polyisocyanurate insulation (R Value of 20+), 5" (100 mm) beaded, overlapping flange, fully welded at corners, and internally reinforced for 40 psf (195kg/m2) live load.
• Curb: 12" (305 mm) in height with integral capflashing, 3" (75 mm) polyisocyanurate insulation (R Value of 20+), fully welded at corners, and 5-1/2" (114 mm) mounting flange with 7/16" holes (11 mm) provided for securing frame to the roof deck.
• Gasket: Extruded EPDM rubber gasket permanently adhered to the cover.
• 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. Designed to hold the cover closed against a 90 psf (438 kg/m2) uplift force. Provided with interior and exterior pull release cables to manually open vent cover.
• Operation: When released, a high performance gas spring opens the cover(s) against a 10 psf (49kg/m2) snow/wind load and locks the cover in the open position. Gas spring has an integral dampers to assure a controlled rate of cover opening and a cyclic durability of 50,000 cycles.
• Performance Rating: UL-listed. Complies with UL 793 and UL 790 Class A (burning brand test).
• Finish: Aluminum: Mill Finish
• Hardware: Type 316 stainless steel hinges. All other hardware is zinc plated/chromate sealed.

Standard Sizes

U.S. Patents  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.