9
Fig.7. Examples of AHU
installation
*H - see table 3
4.2. Connecting the ventilation ducts
Attention: Before connecting the ducts, it is necessary to make an electric connection of motor
fan, in order to ensure an appropriate direction of the fan rotation.
The ventilation ducts should be connected to the AHU with flexible connections (optional accessory) which
suppress the vibrations of the unit and level the coaxial deflection of the duct and the AHU outlets. Flexible
connections are equipped with flanges and sealing. The flexible flanges should be connect with ducts by
drilling screws (Fig.8a) or additional clamping elements (Fig. 8b). Materials to connect ducts are not supplied as
standard delivery.
The flexible connection should be stretched to about 110 mm.
The ducts connected to the AHU have to be suspended or underpinned with dedicated support elements.
Conducting the ducts with the fittings should be done in such a way so as to avoid eliminate possible increase of
the noise level in the ventilation system.
a)
b)
Fig.8. Duct’s connection rules
