This Prefco / Bullock combination air / smoke / fire damper is a unique 3 in 1 damper. Designed to perform three important but basic functions within the buildings heating, ventilation or air conditioning (HVAC) system.
A fire damper, to stop materials of combustion transferring throughout a building and retain a compartments fire integrity
A smoke damper to control toxic smoke from a fire zone.
To simply control conditioned air in various areas when required.
A combination of all three in the one fire rated element.

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Prefco / Bullock combination Air / Smoke / Fire Damper
Fire Tested for a 4 hour rating to AS1530.4 - 1975, BS476: Part 20 - 1987
Fire Tested for a 3 hour rating to UL555. Performance leakage test to UL555

Motorised combination air / smoke damper.

The Model 5000 Prefco / Bullock motorised air / smoke damper features a 1.2mm galvanised steel fire damper casing complete with flange angles. Roll-formed galvanised steel blades are centre pivoting allowing bi-directional airflow and operation at elevated temperatures.

This unique blade design is airflow test proven to be superior to airfoil type designs, resulting in less airflow resistance, The actuator drive is a zinc plated 12mm round shaft which is mechanically fixed to the blades via stainless steel pivots, ensuring a smooth positive blade action at various velocities. Zero torque is required when the damper blades are in the closed position due to the patented knee action blade locking and smoke sealing system.
Optional extras Available
Minimum sizes apply

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Motorised combination smoke / fire damper.

The Model 5020-1 Prefco / Bullock motorised smoke / fire damper is based upon the Model 5000 and comes complete with the McCabe" Link. The McCabe" Link is a 68 degree C. re-settable, re-usable bi-metallic thermal link.

Once the disconnect temperature of the link is reached, the spring loaded damper blades snap closed. the patented knee action blade locking system holds the blades tighly closed. This can be over ridden but only if the link has cooled to a temperature below 68 Deg.C. and if the actuator is still operational, to cycle the reconnection of the link to the blades. Smoke purging of the fire zone can then be achieved if the actuator power is then de-energised.
Optional extras Available
Minimum sizes apply

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Combination Motorised smoke / fire damper with remote control electric McCabe" Link.

The Model 5010 Prefco / Bullock combination motorised air / smoke / fire damper with smart override capability is also based on the Model 5020-1 with a unique additional feature. 

The Model 5010 incorporates an electrically energized heating element laminated directly to the bi-metallic McCabe" Link in the dampers operator. The controls for this link can be monitored from a central control room, this gives you the advantage of after hours damper testing when coupled with a micro-switch signal design. Only 24 Volt A.C.-63 watt low voltage power is required. When the link is tripped through elevated duct temperature or electrical impulse, the blades spring to the closed position physically disconnecting them from the drive shaft Therefore, an actuator is only needed for automatic reset / reopen.
Optional extras Available
Minimum sizes apply

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After 16 years - still in perfect working order.

Minimum Size Available: 250mm wide x 300mm high.
Maximum Size Available: 2793mm wide x 2300mm high.
Minimum wall thickness: Duct to Duct = 90mm. Duct to Grille = 260mm (maximum recess = 40mm).
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The McCabe re-settable, re-usable, bi-metallic thermal 68 Degree C. Link (standard) Tested to AS1890 - 1976. Test Number - 2847. (NATA - 607.)
Underwriters Laboratories Test (UL33) - 1976. Test Number - R7569.

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