k
p
q
k
p
q
(
)
2
EXP Free x
Tomelilla
Sweden
XXX
k = XX
k
p
q
FRÅ
NLU
FT /
EXTR
ACT AI
R
Installation
The air diffuser is normally suspended from the ceiling.
An M8 pop nut, i.e. a threaded grommet that facilitates
installation, is provided at the top and in the centre of the
air diffuser. On sizes 315 and 400, there are two M8 pop
nuts for more stable mounting, see figure 1 and 3.
Alternative installation in pre-punched Ø10 mm hole, see
figure 3b.
Commissioning
Commissioning should be carried out with the wall dif-
fuser face mounted. Pull the measuring tubes and damper
adjustment cords out of the air diffuser through the hole
in the front. Then connect the manometer to the cor-
rect measuring tube(s); A transparent measuring tube for
extract air. The rated coefficient of performance of the
air diffuser can be used in a calculation to determine the
required commissioning pressure. Conclude commissio-
ning by adjusting the damper to the correct blade posi-
tion, tie a commissioning knot in the damper cords to
indicate the damper position. See Figure 1.
The K-factor is specified on the product’s identification
label and last in these instructions.
Maintenance
• Clean the air diffuser if needed with lukewarm water
and dishwashing detergent added.
• The duct system can be accessed by lightly pulling
the spring-loaded diffuser face downwards and then
tilting, see figure 4.
• Dismantle the perforated air distribution plate located
on the inlet as shown in figure 5.
• Loosen the damper in the inlet from its bayonet fastening
by rotating to the side.
Figure 1. Installation. Commissioning. Maintenance.
q
= measured flow l/s
p
= current pressure reading (Pa)
k
= commissioning factor
k-factor
0xD / ±5%
0xD / ±5%
2xD / ±10%
Figure 2. Length of straight section of duct
EXP
Free b
Installation – Commissioning – Maintenance
20220217
