Fire Damper Maintenance

All fire safety systems must be regularly and professionally maintained to ensure the safety of building occupants - a faulty fire damper will not prevent the spread of fire. 3. The smoke and fire damper of claim 1 wherein the said first spring has an initial untensioned diameter that is greater than the diameter of the step portion and the hub when the cable means is functioned to its second position upon deactivation of the motor.
When it comes to installing fire dampers in ducting there is a right way and wrong way to do it. If your fire damper has been installed in the wrong airflow dayton fusible link direction or even upside down (again we've seen it happen) it is not going to be able to stop the fire from passing through your ventilation system.

The main difference between the two designs is dynamic dampers (in most cases) utilize springs to pull the curtain closed against the air pressure and velocity while static dampers rely solely upon gravity to pull the curtain closed (static dampers designed for floor installation utilize closure springs).
According to the BS9999 Fire Damper Regulations, arrangements should be made for all fire dampers to be tested by a competent person on completion of installation and at regular intervals not exceeding two years (HTM03-1 requires hospitals to have their dampers tested every 12 months).
The cables 132, 134 will play out from the motor pulley 86 and thus permit the blade assembly 20 to drop downwardly within the space defined by the damper flanges 14, 16 to thereby effectively close the opening 36' through the smoke and fire damper 10'.

In accordance with usual fire damper and smoke damper construction, the blades 20 are preferably of the interlocking steel blade type wherein the horizontal marginal edges 22, 24 of adjacent blades 26, 28 are suitably formed to interfit and interlock to permit rotary engagement whereby each blade 26 is freely pivotal about its adjacent blade 28. In the present embodiment, the uppermost blade 30 is riveted to a false housing 31 which connects to the top of the frame 12 and is always securely fastened in position.
In the European designs, the turning mechanism is fully contained, permitting the dampers (subject to type approval) to be grouted in place, which permits a heat sink effect to conduct heat from an accidental building fire, which impinges upon a duct and damper, to be conducted into surrounding structures.