Humidity control

[eshook]

Yeah I know what your talking about with the moving flaps das. You're saying you don't get a horrible draft using one of those in your fish room? I would be concerned with the wind.

 

[das75]

see more commonly the hooded vent such as the picture in this link used on walls and is what I have. Draft isn't a problem. Just look around, you'll see then on houses , condos, sides of apartment building etc.

Also for a furnace that draws combustion air from a room of a minimum size (forget the exact volume) and a certain CFM a fresh air feed must be installed. Often is a wall vent similiar to the one in the link but without the flapper and duct goes to the floor in the furnace room (duct usually goes into a cold air trap which basically isn't more than a pail). Never seems frost from those either.
diagram

 

[dendro982]

Thank you for the information, das75! Much appreciated.
So far I'm keeping part of window open all year round, pretty cold in basement, starting from 12C and down outside.
Thinking about making air intake, exhaust and ventilation, but have to collect more information.

 

[das75]

the most energy efficient solution is a HRV , cost a lot more than a bathroom fan though.

http://www.cmhc-schl.gc.ca/en/corp/nero/retousar/2008/2008-06-10.cfm

Another thing, excess humidity more often is a problem in summer, and in the winter months (at last in the climate where I life) people add moisture to there home with a humidifier either on the furnace or stand alone.

A bathroom type fan could be installed for the warm periods and if concerned about drafts in the winter, simply block the vent off (duct tape the flapper closed, etc). If moisture still a problem, use the dehumidifier then.

 

[dendro982]

Thanks!