Assembly
In order to fulfil the requirements for air-tightness class D, the device must be installed as per ‘Assembly Instruction
Lindab Safe’.
The device must be installed with the air flow in the direction of the arrow.
The device allows 50 mm duct insulation without sticker or measuring points being hidden.
The cup around the damper knob allows 50 mm duct insulation without the knob being hidden. For 100 mm insulation,
an insulation cup, IK, is available.
For optimum readability (regardless of the installation position), the plate with the sticker can be turned or easily remo-
ved and positioned separately from the device.
Measurement
By measuring the pressure difference ∆p in Pa at the measuring points, you can achieve a flow q in l/s using the equa-
tion on the device.
You can set the desired flow, as the damper blade is adjustable through 0–90° (0°=fully open, 90°=completely closed)
using the knob in the cup. Locking is performed using screws for Pozidrive (PZD2) and the damper angle can be read
off a stamped grade on the edge of the cup.
The specified flows only apply for air with a density of 1.2 kg/m
3
. For air of another density (r
other
) the flow
(q
other_density
) is achieved as per the formula:
q
other_density
= q
equation
×
ρ
Dimension
mm
k-factor
Colour coding
for measuring
points
80 2.99 transparent
100 4.90 red
125 7.9 5 green
160 13.8 yellow
200 21.3 blue
250 34.6 black
315 57. 8 white
400 88.8 transparent
500 146 red
630 234 green
Systematic error
Straight stretches are required in order to achieve flows as per equations with specified accuracy. The systematic error
m
2
is 5% and 10% below the minimum requirements for straight stretches as specified.
Maintenance
The device normally doesn't requires any maintenance.
Flow meters
FMDU
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