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NB. The diameter specified for pipes for sound absorption valves is a maximum dimension. On account of the
material’s tolerances, the actual diameter may be slightly less.
As described in the user manual, a slightly larger hole than the diameter of the bushing will be required as the valve
must slope outwards approximately 1°. The area between the wall and the bushing can then be insulated with a
suitable insulation material.
2.
External valve
Assemble the external valve with enough modular pipes (Fig. on page 18 Description) that they almost pass
through the wall (extra connection pipes can be purchased as required (product code 09162/09166/09167)).
Take out the insect screen in the external valve (Fig. 3 page 21).
Insert the external valve with modular pipes through the wall from the outside and fix the valve with 4 screws (Figs.
4/5).
Replace the insect screen.
Fit the external cover (Fig. 6 page 21).
3.
Internal part
Remove the external cap by pulling carefully in two corners.
Apply some silicon to the boss.
Insert the boss in the modular pipe (Fig. 7 page 21).
Screw the internal part in place with 4 screws (Fig. 8 page 21) (the opening for the adjustment switch must be on
the underside).
Attach the external cap.
4.
Installation of sound absorption valve
As described in 1-3, but modules are replaced by a sound-absorbing wall bushing (Fig. on page 18 Description).
Cut the wall bushing to the relevant wall thickness.
The degree of sound absorption is described under Sound Absorption.
5.
Installation of cover plate (for Aero 160 and sound absorption valves)
Cover plates are fixed with 4 screws on the internal and external parts before they are installed on the wall/duct
(Figs. 9/10/11 page 21).
6.
Adjusting the air flow rate
The air flow rate is adjusted by pushing the switch on the underside of the internal part (Fig. 12 page 21). Air flow
rates are described under Capacity.
7.
Cleaning/replacing the filter
Remove the external cap on the internal part by pulling carefully in two corners.
Lift out the outer filter holder (Fig. 13 page 21) and remove the filter.
Insert the new/cleaned filter and press it into place with the filter holder, which is attached at four corners.
8.
Installing cords
Alternatively, the air flow rate can be adjusted using cords that can be purchased as an accessory (product code
51005). You need 2.
Drill two holes in the grooves on the internal part (Fig. 14 page 21), thread the cords through and fix them as shown
in Fig. 15.
9.
Installing the baffle in the sound absorption valve
To use the enclosed baffle in the sound absorption valve, place it inside the sound-absorbing pipe. Centre the
baffle in the bushing. It must be in the insulation pipe, not in the internal/external boss. As previously mentioned,
using the baffle produces an additional sound reduction of 2 dB.
