The typical US fire-smoke damper requires 5-15 in-lb torque
per square ft. [6-17 Nm per square meter] at 350°F [171°C]
under dynamic load (2400 fpm [12m/s] velocity).
The FSNF will operate multi-section dampers using multiple
actuators for multiple sections. Some of the methods used are
shown below.
Multi-section damper assemblies – typical applications
Application information
Replacement applications
When actuators fail on existing dampers, the local authority having
jurisdiction sets the code requirements for replacement actuators.
The local inspector or fire marshal should be consulted. In most
jurisdictions, the replacement actuator must be “equal or
better”.
The FSNF will meet or exceed requirements, in most applications.
Caution must be used when replacing failed motors with new
Belimo actuators. Many old competitive motors did not have
internal springs and depended on external springs on the side of the
damper or wrapped around the damper shaft to close the damper.
Remove excess parts without interfering with fire functions.
In some cases, the damper must be replaced because the
damper would have to undergo major modifications to replace
an actuator.
Call Belimo to obtain a pdf version of a guide to replacement
smoke damper actuators including a checklist for proper testing.
Smoke Control and Combination Fire and Smoke Control
Actuator FSNF
All smoke and combination fire and smoke dampers shall be
provided with Belimo FSNF US actuators. No substitutions
allowed.
Damper and actuator shall have UL555S Listing for 350°F [171°C]
(250°F [121°C]) and shall drive open in 15 seconds and spring
closed in 15 seconds.
Typical specification
electrical ground connection.
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