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ALNOR
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ventilation systems
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User Manual
HRU-PremAIR
4.4 Ducting installation
1. Usually you will connect your ducting directly to HRU Ø160 connectors
(figure 20 Although HRU-PremAIR has very low Sound power level in some cases it is recommended
to install additional silencers (on supply and extract sides) to provide high level of acoustic comfort.
Description of connections:
SUPPLY – warm fresh air incoming to house
EXHAUST – cool stale air exhausted to outside
EXTRACT – warm stale air extracted from house
OUTDOOR – cool fresh air taken from outdoor
2. If you want use different duct connectors it is possible to unmount NSL male connectors and easily install
replacement fittings (for example elbow, offset bend, etc.). NSL connector are snap-on mounted, to
unmount them you need to pull them up using a some force (see figure 21).
Optional fittings connected to HRU must be in male-ended according to ALNOR’s dimension standards
(see our SPIRAL® catalogue with dimension tolerances). To provide the best tightness we suggest to use
ALNOR’s products with gasket. We are not responsible for tightness if fitting are purchased from other
companies.
Figure 20 - holes dimensions for wall mounting
Figure 21 - fitting’s change
