0400_IOM_1.
1_Mar21_4
4
PRODUCT
0400MAN
APPLICATION
FLEXIBLE SUPPORTING CONSTRUCTION
CLASSIFICATION REPORT NO.
P105424-1003
CLASSIFICATION
E120 (VE I
O)
TESTED INSTALLATION METHOD SHOWN. DIFFERING INSTALLATION METHODS TO THIS MUST BE APPROVED BY THE BUILDING CONTROL AUTHORITY (BCA) BEFORE PROCEEDING.
FIRE – 0400MAN CIRCULAR FIRE DAMPER IN FLEXIBLE SUPPORTING CONSTRUCTION
OPEN
CLOSE
Access door
Fire batt
Two hour rated flexible supporting
construction to BS EN 1363-1:2020
15mm thick gypsum boards
Steel stud depth – 71 to 100mm
Installation sequence
3
The drywall will consist of two layers of 15mm plasterboard on each side of steel studwork with an
optional 50mm mineral wool insulation. The opening will be a letterbox construction with overlapping
layers of plasterboard.
4
The damper should be mounted in the opening with the fixing flange (access side) flush with the wall.
5
Confirm that the blade is horizontal, and the handle is on the RH or LH. The flange can then be secured
to the wall using M3.5 x 38mm drywall screws which are to pierce the steel channel. Ensure that all the
pre-drilled holes are populated.
6
The gap between the damper and the wall opening will need filling with two layers of 50mm thick
140kg/m
3
fire batt cut to interference fit and pushed into place. All cut edges must be sealed with a
fire batt sealant to BS EN 13501-2. A fire rated intumescent mastic to BS EN 13501-2 shall be applied to
each joint.
7
The galvanised mild steel ductwork connecting to the damper spigots should overlap by 30mm,
leaving a 10mm clearance for any duct expansion in a fire situation.
8
The galvanised mild steel ductwork connections must be sealed with an approved galvanised mild
steel ductwork sealer and fixed with low resistance fixings such as aluminium rivets that will melt at
high temperature allowing the duct to break away without affecting the integrity of the installation.
9
The connecting galvanised mild steel ductwork must be independently supported within one metre of
the connections and have been installed in accordance with DW144.
10
An access door should be fitted on the access side of the damper for inspection and maintenance.
11
When the damper installation is complete the operation of the damper should be checked.
12
Complete DW145 Fire Damper Certificate.
Preparation
1
Ensure the that damper is kept in a clean dry
environment and that there is no damage to the
damper.
2
Work out the opening size to be cut by adding
55mm to the duct diameter and cut a square hole to
that size, see adjacent table.
Nom. duct diameter
Opening size
100mm
155 x 155mm
125mm
180 x 180mm
150mm
205 x 205mm
160mm
215 x 215mm
200mm
255 x 255mm
250mm
305 x 305mm
300mm
355 x 355mm
315mm
370 x 370mm
