HVAC
ROCKWOOL® productSHEET
600 314-02/14_V1 (en)
ROXUL Bradflex
Flexible Duct
General Product Information
Bradflex is a highly flexible, lightweight and quality duct.
The duct’s smooth interior presents low airflow resistance
It is factory fabricated from aluminium laminate with an
and high tensile steel wire helix can withstand rough
encapsulated steel wire helix. Glass wool insulation is
handling. The duct maintains its full diameter on bends and
factory applied and sheathed with an outer aluminium
can be compressed for ease of transportation.
laminate vapour barrier.
HVAC
ROCKWOOL® productSHEET
600 314-02/14_V1 (en)
ROXUL Bradflex Flexible Duct
Common applications
Technical Parameters
Bradflex is commonly used in commercial and residential air
Rated air velocity: 30 metres/second
handling applications. It is designed to convey air and
Service temperature (insulated duct): Between
provides easy alignment between rigid duct and air terminals
-20°C to +120°C
such as diffusers. Bradflex is recommended for use in low
Max. working pressure: 2.5 kpa positive
and medium pressure HVAC system.
Dimensions
Max. vacuum pressure: 0.13 kpa
Note: To ensure a margin of safety, we recommend pressure not greater than 750 pa when operating under maximum velocity
Reaction to fire: Rated as Class O for insulated duct and tested to BS475 Part 6: 1988 & Part 7: 1997 Diameter
Nominal diameters from 100mm to 250mm in 25mm increments and 300mm to 500mm in 50mm increments.
under the requirement of FSSB
Thermal Resistance (R) values for insulated ducts
16kg/m³ x 25mm thick 0.69 m²K/W
Insulation types
24kg/m³ x 25mm thick 0.75 m²K/W
Glass wool in 16kg/m3x25mm, 32kg/m3x25mm and
32kg/m³ x 25mm thick 0.77 m²K/W
32kg/m3x50mm
32kg/m³ x 50mm thick 1.50 m²K/W
Length
10 m per length
5 m per length for ducts with insulations in 32kg/
Pressure Drop Chart
PRESSURE DROP – STRAIGHT RUNS
10.0
8.0
m3x50mm for diameter from 300mm to 500mm
6.0
5.0
Packaging
ER
ET
CT
4.0
DU
3.0
M
DIA
m)
(m
450
400
350
0
30
Each length of plain Bradflex is compressed to approximately
400mm and packed in strong clear plastic tubing.
Insulated Bradflex is compressed to approximately 1600mm
.80
5
17
.60
.50
150
.40
5
12
.30
.20
100
75
10
facilitate handling and storage.
0
25
225
200
1.0
20
18
16
14
12
to 2000mm and packed in strong clear plastic tubing to
9
.10
.08
8
6
OC
VEL
7
.06
.05
5
ITY
.04
4
.03
S
M/
CUBIC METRE OF AIR PRESSURE PER SECOND (C.M.S.)
2.0
.02
.01
.1
.2
.3
.4 .5 .6 .8
1.0
2
3
4
5 6
8 10
20
30
40 50 60 80 100
PRESSURE LOSS IN mm WATER PER METRE LENGTH
www.rockwoolasia.com
ROCKWOOL Building Materials
(Singapore) Pte Ltd
No. 8, Tuas Avenue 2
Jurong Town
Singapore 639448
T (+65) 6861 4722 / 6863 6233
F (+65) 6862 3533 / 6863 2933
Disclaimer: The information contained in this
data sheet is believed to be correct at the date
of publication. ROCKWOOL does not accept
responsibility for the consequences of using
ROXUL Bradflex Flexible Duct in applications
different from those described above.