Smoke and Fire Prevention Systems
Fabri-Lock System

Smoke and Heat Vents

The temperature rise in a building without fire ventilation is over three times the temperature rise in a building with fire venting, and where fire venting is absent, the temperature exceeds that at which structural steelwork will distort and buckle.

When floor areas are large there is a rapid lateral fire spread in an unvented building. The hot gases from a fire which involves only part of the floor area of a building rise to the ceiling and form a layer; this layer of hot gases will build down to the floor level and obstruct the seat of the fire.

DropLock System
  No Smoke Logging:
By releasing the heat, smoke and the general products of combustion, fire venting enables firemen to approach the source of the fire and tackle it without breathing apparatus

No Explosion:
Fire venting quickly removes the partially burnt gases which otherwise accumulate in the roofspace and present a danger of explosion.

Reduces Lateral Spread of Fire:
By preventing heat from mushrooming over the fire area and heating other materials to the point of ignition, fire venting has a marked effect on reducing the lateral spread of the fire.

Reduced Roof Temperature:
Fire venting reduces the temperature in the roofspace well below the softening temperature of structural steelwork.

Reduced Water Damage:
By applying water directly onto the fire, instead of generally toward smoke logged areas fire venting reduces water damage.

Draftstop System

Ventilator Sizing
The proper size and quantity of fire ventilators required is generally based on the occupancy class of the building relating to the combustible nature of its contents. Listed below are general classes of occupancy and recommended vent areas. These are intended as a general guide only and deigners should consult NFPA 204M or Western Canwell if specific questions arise.

  • Low Heat Release Occupancy - Vent area to floor area 1:150 - Includes building or portions of buildings containing scattered small quantities of combustible materials. Typical examples are metal stamping plants, machine shops with dry machining and like operations, foundries, breweries, dairy products processing plants, bakeries, meat packing plants.

  • Moderate Heat Release - Vent area to floor area 1:100 - Includes buildings or portions of buildings containing moderate quantities of combustible materials which are fairly uniform. Typical examples are automobile assembly plants, leather goods, printing and publishing plants, machine shops using combustible oil coolants.

  • High Heat Release Occupancy - Vent area to floor 1:50 - Includes building or portions of building containing either hazardous operations or concentrated quantities of combustible materials of both. Typical examples are painting departments, oil quenching departments, chemical plants, paper mills, rubber products manufacturing plants, chemical plants.


Standard Sizes
Model No. Inside Dim. W x L Vent Area Sq. Ft. Net Wt. Lbs.
250-44 48" x 48" 16 345
250-45 48" x 60" 20 380
250-46 48" x 72" 24 415
250-47 48" x 84" 28 450
250-48 48" x 96" 32 485
250-55 60" x 60" 25 425
250-56 60" x 72" 30 465
250-57 60" x 84" 35 520
250-58 60" x 96" 40 540
250-66 72" x 72" 36 525
250-67 72" x 84" 42 545
250-68 72" x 96" 48 565
250-69 72" x 108" 54 590
Series 250 Firex* Features
Impact Resistance - extruded polycarbonate sheet is so tough it withstands the impact of a 10 pound ball dropped 7 feet onto a 6mm thick sheet without breakage. Extruded polycarbonate has 4 times the impact resistance of modified acrylic, and maintains its properties from minus 40 degrees F to 250 degrees F.

Energy Efficient - Extruded polycarbonate channels trap air between walls, giving up to 40% greater energy efficiency over traditional materials.

Skylights, Heat, and Smoke Venting - Western series 250 Firex* with extruded polycarbonate doors offers U.L. and FM approved Heat and Smoke ventilators with the added advantage of skylights. The extruded polycarbonate panels are translucent, high impact resistant, and energy efficient. Extruded polycarbonate is one of the most cost effective glazing materials on the market. Its light weight, rigidity, toughness and long service life make it far superior to monolithic glazing with acrylic, glass, or other mediums. Series 250 Fires* with extruded polycarbonate doors are available in unit sizes the same as standard Series 250 and can be constructed of steel or aluminum.

High Light Transmission - Extruded polycarbonate sheet has approximately 90% the light transmission of monolithic glass.

Light Weight - Extruded polycarbonate sheet is almost 7 times lighter than double walled glass, and less than half that of modified acrylic.

Ultraviolet-Resistant - Extruded polycarbonate resists weathering and resultant yellowing 3 times longer than untreated polycarbonate.

*FIREX is a registered trademark of Western Canwell, LLC
Series 300 Firex* Features
Automatic or Manual Operations - Unit opens automatically by parting of listed fusible link. Unit can also be manually opened from roof or floor level.

Pressure Operation - Doors open automatically by explosion, resistance to internal pressure is factory adjustable in a wide range or pressure is factory adjustable in a wide range or pressures of 45 PSF. Travel of door for automatic self-triggering device may pre-set for hair-trigger operations.

Heat, Smoke, Explosion Vents - The economical venting system for restricting fire from spreading, extracting heat and smoke, relieving explosive pressures, and providing access for fire fighters.

Western Series 300 Firex* ventilators can be constructed of galvanized steel or aluminum and furnished in all sizes as the 250 Series. Like the 250 Series the 300 series may be furnished with extruded polycarbonate doors or spliced into multiple unit runs.

Weathertight - Door mating surfaces are gasketed to prevent the entrance of water in the severest winds and rain. Two double wall doors have 1" laminated insulation between steel walls to protect against condensation and heat loss when closed.

Operating Mechanism - All pivots, bearings, and operating mechanisms are constructed of non-corrosive detail.

*FIREX is a registered trademark of Western Canwell, LLC
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