Model FSD 415 “OLS fire-smoke dampers can effectively isolate the fire zones and keep the escape route and fire fighting access clear of fire and smoke.” The model FSD 415 motorised fire-smoke dampers have been designed with carefully slected components to ensure long-lasting, trouble-free and reliable operation. Stainless steel components are used on moving parts, whenever possible and where necessary, so as to prevent seizure during a fire. It is designed to withstand thermal shock due to fire and hot gasses so that blade distortion is minimised and, hence, smoke leaking through the damper is reduced. Fire-smoke dampers can effectively isolate fire zones and reduce the spread of toxic smoke and fire, and this keep the escape routes and fire-fighting access clear. When an HVAC system is turned off, the fire-smoke dampers still offer protection against the spread of fire and smoke. Construction The FSD 415 motorised fire-smoke dampers are constructed of high quality hot-dipped galvanised steel except for the breaing, jamb seal and blade-edge seal, which are constructed of bronze, stainless steel and silicon respectively. The damper sleeve is constructed of 2mm-thick galvanised steel that is fully welded at each corner. The blade is constructed of 1.2mm-thick specially formed with two ‘V’ and one ‘U’ grooves designed for rigidity. The blades with 13mm square steel axles at each end pivot on bronze bushes. Stainless steel compression jamb seal is incorporated on the vertical frames and silicon seal on the blade edge to minimise leakage. Interconnecting blade linkages are located outside the air stream and pivot on stainless steel pins to prevent serizure. For damper installed within the wall the actuator may be installed inside a compartment on the damper with can be easily accessed by removing the access panel outside the duct as shown in figure 1. For wall mounted damper with actuator installed outside the wall, no actuator ccompartment will be provided as show in figure 2.

Features

•	Damper constructed of high quality, hot-dipped, pre-galvanised steel
•	All moving parts are constructed of stainless steel to prevent seizure
•	Silicon blade-edge seals and stainless steel jamb seal ensure low leakage
•	Withstand pressure of 2000Pa
•	Fire rating of 3 hours
•	Low pressure loss
•	Damper may be operated by electric or pneumatic actuator

Additional Features
OLS fire smoke dampers provide the following additional control features to the building owner:

• Fire-smoke dampers may be integrated into the “Fire Control Strategy” and the plant control systems. • Safety function can be regularly and easily tested locally and from central remote location. • Provide continuous monitoring of damper positions (operating and safe positions). • Any necessary maintenance or repair work can be readily identified and carried out easily.

Figure 3: An example of Fire Control Strategy

Operation of OLS Motorised Fire-Smoke Dampers
OLS motorised fire-smoke dampers are equipped with thermal fusible link and spring-return type electric or pneumatic actuator. Generally, the thermal fusible link will automatically close the damper and isolate the fire zone in question when exposed to high temperatures locally. They can also be triggered by a smoke detector or fire alarm contact from a remote point.
The motorised fire-smoke dampers operate in the normally opened position. During a fire, the dampers respond to a signal from the fire alarm system by closing the damper to prevent the spread of toxic smoke to other parts of the building. If fire breaks out in the vicitinty of the damper, the thermal fusible link will operate to close the dampers, preventing the spread of fire to adjacent zones. Each motorised fire-smoke damper is equipped with a spring-return type actuator that will return the damper to closed position(fail-safe position) during power failure. The dampers should be connected to a central control for remote monitoring and regular testing of the damper function.
The motorised fire-smoke dampers can be interlocked to the HVAC sustem such that when the plant is turned off (e.g. at night and during weekends), the dampers can be closed to provide isolated zones, preventing the possible spread of smoke should a fire start when the building is unoccupied. In the event of a fire, the motorised fire-smoke dampers can form part of a “Fire Control Strategy” and can be used to ventilate pressurised escape routes, keeping them cleared of smoke so that the building can be evacutated swafely. Once the building has been evacuated and the fire team has arrived, it may be possible to re-open some of the motorised fire-smoke dampers from the central point to provide smoke clearance.

Performance Tested

OLS motorised fire-smoke dampers have been tested for fire resistance of up to 3 hours at the temperature of over 1000°C, according to the British Standard B.S. 476: Parts 20 and 22 – based on net size of 1940 × 1200mm (i.e. excluding motor compartments). The damper was also tested for air leakage, pressure loss and pressure rating. The results of the tests are shown on charts 1, 2 and 3, respectively. Air leakage test acorss the dampers shows that leakage is only 0.45% based on the pressure differential of 1000 pascals and duct velocity of 10.2 metres per second. Air leakage test was carried out based on the damper size of 1940 × 1200mm and according to Australian Standard, A.S. 1682.1 Part 1. Pressure test was carried out based on damper size of 1940 × 120mm and according to ISO 7244. Pressure test shows a maximum deflection of 3.2mm equivalient to 1/250 of blade length.

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