Which Passive Vent for condensation?

Postby Twister99 » Fri Jan 30, 2009 1:21 pm

Hi guys

I have a condensation problem and understand that fitting a passive humidity vent would go some way to alleviating this problem.

The difficulty is that I have been recommended three specific units at similar prices but had no idea which is the best.

They are
Passyfier vent www.condensationshop.com/products/passyfier/

Fresh 99H by Passivent
www.bsee.co.uk/news/fullstory.php/aid/2 ... ATION.html

Aereco EHT 17 40

What is your experience with either of these and which would you recommend for moisture/humidity absorption?

Many thanks
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Simply Build It

Postby Perry525 » Mon Feb 02, 2009 8:14 pm

Passive vents are a good idea but, they don't work.

Better to solve the condensation problem.

Condensation is caused by people.

People put water vapour into the air of their homes.

They do it by breathing, sweating, washing, leaving doors open, drying things on radiators etc;
Not having extractor fans in kitchens and bathrooms or not using them or not using them long enough.

Possibly the worst thing is to turn the heating down or off at night or when going out.

Warm air holds much more water vapour the cold air, so when the temperature drops in front of the windows because you have drawn the curtains or closed the blinds, the trapped air gets cold and out comes the condensation, don't do it the window surface stays warm and no or very little condensation.
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