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2 or Outside the unit comes pre-assembled and is easy to install in both new build or when replacing an existing fan
Optional LCD digital controller with four independent environmental profiles
So if you have a S90B then this fan is its direct replacement and it will fit in the same space as your existing product and ducting
3 metres to either 2
'X' suffix models also have powered electric anti-backdraught shutters 258112
Zehnder ComfoAir 350/550 Filter Set, ISO ePM1 (F7), 2 pcs REPORT-CAT-072 2 or Outside the unitIdeally, filters should be inspected monthly and given a light vacuum to remove dirt and debris. Filters will eventually become blocked with residual debris and should then be replaced. Generally, blocking will occur every 6 12 months depending on the location (near busy roads or inner city areas tend block more quickly than remote country settings). To see the Zehnder Filter fiting video on youtube please select: Comfo Air 350 Filter video Zehnder P