Test Data
Fire Tests
All fire tests were conducted by the Warrington
Research Centre to BS476 Part 20 1987.
This standard describes the performance of
structural elements under fire conditions. It was
decided to mount the unit in the face of a 3m sq.
vertical furnace, and subject it to the test
described.
Test Description
The test specimen was fixed to a brick wall built
within a framed lined with refractory concrete at
the test laboratory. This frame was then
mounted such that the complete assembly
formed the front vertical face of the gas fired
furnace. The furnace was provided with
thermocouples arranged such that they were
evenly distributed over the exposed face of the
test construction and with their hot junction
100m from the nearest part of the construction.
Test Result
The damper assembly operated satisfactorily
and retained its integrity for the 240 minute
heating period, during which time there were not
any significant gaps in or around the assembly
to permit the passage of flames.
Air Velocity Against
Pressure Drop
The graph opposite has been formulated to give
an indication of the pressure drop expected
through a fully open damper in relation to duct
air velocity.
Airflow Blade Leakage Against
Differential Pressure
The graph opposite illustrates the maximum
leakage obtainable when the damper is in a fully
closed position under ambient temperature
conditions.
Standard Time - Temperature Curve Of BS476 Part 20 1987
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
Temperature - Deg C
0
20 40 60 80 100 120 140 160 180 200 220 240
Specified Furnace Temperature
Time - minutes
Air Velocity M/S
Dif
ferential Pressure (Pa)
1000
9
8
7
6
5
4
3
2
9
8
7
6
5
4
3
2
2
3
4
5 6 7 8 9
10
9
8
7
6
5
4
3
2
100
10
100
2
3
4
5 6 7 8 9
1
Leakage Rate L/S
Dif
ferential Pressure (Pa)
10000
9
8
7
6
5
4
3
2
9
8
7
6
5
4
3
2
2
3
4
5 6 7 8 9
10
9
8
7
6
5
4
3
2
1000
100
100
2
3
4
5 6 7 8 9
1
Ductgard
Leakage under
Fire Test
(Unit Tested 1m
2
Face Area)
13
DUCTGARD
Duct Mounting Smoke and Fire Control Dampers
