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Andrew PollardHi Nik
The primary function of a ventilation system is to reduce moisture.
The Otago report showed there is not a large opportunity for these systems (roofspace forced air ventilation systems) to provide heating or improve temperatures within the spaces.
They may be some heating/temperature advantage during the day however the Beacon work showed that during the day the roof space humidity levels were elevated and using a system during the day may not deal with the moisture appropriately.
BRANZ currently is undertaking work within an experimental building on ventilation strategies and this will include some information on heat transfer…
