Bathroom extractor fan ducting - is there a length limit?

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5 Oct 2005
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Is there a max length to which extraction becomes ineffective/turns to condensation? Is it a building control issue?

Thx
 
Condensation is not distance related it can occur on a short run if ducting is cool and air is moist, longer runs simple require a more powerful fan.
 
Oh, Ok, thx - what distance do most offer - I thought it was around 3m?
 
Dozens of different fans speeds and therefor efficiency, the higher wattage tend to have higher volume capacity.
 

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