2
HSDV – Roof Fan Attenuator
Installation and Operating Instructions
1 .4 Area of application
Normal use:
The roof fan attenuator is designed for installation on a roof fan, for noise attenuation on discharge. The average atte-
nuation value is 8 dB. The roof fan attenuator can also be attached subsequently without structural modification. The
permissible air flow temperature is -20 °C to 80 °C.
The roof fan attenuator is suitable exclusively for roof fans in series VD (sizes
∅
315-630 mm) of types AC and EC
from Helios Ventilatoren.
1 .5 Personnel qualification
The installation may only be carried out by specialists (e.g. industrial mechanics, mechatronics engineers, metal workers
or persons with comparable training).
2 .1 Warranty claims – Exclusion of liability
All versions of this documentation must be observed, otherwise the warranty shall cease to apply. The same applies
to liability claims against Helios Ventilatoren. The use of accessory parts, which are not recommended or offered by
Helios, is not permitted. Any possible damages are not covered by the warranty. Changes and modifications to the
unit are not permitted and lead to a loss of conformity, and any warranty and liability shall be excluded in this case.
2 .2 Shipping
The roof fan attenuator is packed ex works in such a way that it is protected against normal transport strain. Carry
out the shipping carefully. It is recommended to leave the unit in the original packaging. The unit must be held by the
casing for shipping or installation.
2 .3 Receipt
The shipment must be checked for damage and correctness immediately upon delivery. If there is any damage,
promptly report the damage with the assistance of the transport company. If complaints are not made within the agreed
period, any claims could be lost.
2 .4 Storage
In case of storage over longer periods, the following measures must be taken in order to avoid damaging influences:
The storage location must be water-protected and free of temperature fluctuations. Storage temperature -20 °C to +40
°C, these limits must not be exceeded. In case of reshipment (above all, over longer distances; e.g. by sea), it must be
checked whether the packaging is suitable for the form and route of transport. Damages due to improper transportation,
storage or putting into operation are not liable for warranty.
2 .5 Noise data
The average attenuation value is 8 dB. With regard to installation, the sound pressure level can differ significantly from
the catalogue data, as it is highly dependent on the installation conditions, i.e. on the absorption capability of the room,
the room size among other factors.
CHAPER 2
GENERAL INFORMATION
EN
