LFD
Fire & Gas Dampers
Typical Applications
Marine, Process and DW144 General Ventilation
the blades in the closed position. To put a precise
figure on the leakage rate is not practical due to vari-
ations in configuration, aspect ratio, number of
Description
blades and perimeter length of dampers with equiv-
alent face areas. Extensive testing on single module
AO A60 Deck & Bulkhead Applications
dampers of size 800mm wide x 800mm high, has
Casing
indicated a mean leakage rate of 0.081 m3/sec/m2
at a differential pressure of 2000 Pa. Specific
The damper frame is a welded and riveted construc-
requirements regarding leakage should be dis-
tion with integral 50mm folded flanges from 1.5mm
cussed with our engineers.
thick steel.
The drive side casing section is provided with a
Per formance
return flange to facilitate the mounting of the actua-
tor bracket. For dampers to be connected to circular
Full aerodynamic performance data is presented
ductwork, transition plates with 20mm spigot con-
below and is based on tests conducted.
nectors are provided.
Blades
50
Single skin 1.5mm thick steel interlocking blades
are securely riveted to continuous 19mm dia tubular
40
shafts. Shafts rotate in flared bearing holes within
the damper case and are linked externally to provide
30
a parallel motion.
The drive shaft is extended for connection to the
20
actuator.
10
Seals
Tight air shut off is achieved by sprung stainless
7
8
9
10
11
12
13
14
steel grade 316L (1.4404) side seals and interlock-
Duct air velocity (m/s)
ing top and bottom angle stops.
Controls for Operation
Manual Spring Release Latching
Mechanism
Pneumatic Actuator
Electric Actuator
Temperature Sensitive Trigger
For full details see Controls Section
page 12.
Options
Material: Stainless or galvanised
sheet steel frames material thick-
ness 1.5mm.
Case Depth: 200mm
Ear th Continuity Bosses
Lifting Lugs
Pre-insulated controls enclosure or
mounting plate
Client specific requirements
Leakage Rates
The fire and gas damper has been
designed to minimise leakage with