What CFM for basement fish room vent
- Thread starter arvind
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http://kenargo.com/questionsAndAnswers/P7.html
This site has sizing guide. I think it recommends 375 cfm for you but it is only a guide. The fan will be more effective if the duct work is short and with few bends. If the room is too air tight, that will also decrease effectiveness. If you live in a humid, hot or very cold area, a dehumidifier might be another option to avoid outside air or to avoid duct installation.
This site has sizing guide. I think it recommends 375 cfm for you but it is only a guide. The fan will be more effective if the duct work is short and with few bends. If the room is too air tight, that will also decrease effectiveness. If you live in a humid, hot or very cold area, a dehumidifier might be another option to avoid outside air or to avoid duct installation.
Kungpaoshizi
Valuable Member
+1 to the above
Dehumidifiers are best too if you have cold winters and hot summers like the Midwest. It sucks to use more energy, but you never want to have to deal with mold after times of high humidity, with a mini-ocean if your house.
Dehumidifiers are best too if you have cold winters and hot summers like the Midwest. It sucks to use more energy, but you never want to have to deal with mold after times of high humidity, with a mini-ocean if your house.
Outdrsyguy1
Active Member
If you add a return vent in the basement, PLEASE be very careful!!!! Many folks have furnaces in their basement and it's quite possible you will create a negative air pressure in the basement which will possibly suck flue gases into your furnace from the water heater or the furnace and blow it into your house (instead of the natural draft vent to outdoors). There's a reason it's against code (at least in my area) and can be very dangerous.
Most people put a separate system in the basement to handle it but if you put a decent sized supply and damper closed the return you created you "should" be okay if the basement stays positive to outdoors.
Most people put a separate system in the basement to handle it but if you put a decent sized supply and damper closed the return you created you "should" be okay if the basement stays positive to outdoors.
OP
OP
arvind
Active Member
The fish room shares the space with furnace, water heater & laundry. I am planning to install the fan in the center of the room with duct running about 6-8 feet to outside. It is not clear to me what is a return line. Can you pl. explain?
Return is the big vent that sucks in air.
Some people change their filter in the return. If your furnace is vertical its the section of ductwork thats on the bottom of unit the supply is on top.
You could cut a square and add a filter rack to the return or cut a circle add a air tight and some flex duct (10 inch) and put it up high smewhere in the room. Use Google for pics
Some people change their filter in the return. If your furnace is vertical its the section of ductwork thats on the bottom of unit the supply is on top.
You could cut a square and add a filter rack to the return or cut a circle add a air tight and some flex duct (10 inch) and put it up high smewhere in the room. Use Google for pics
They build houses in my area with returns in basement granted not in same room unless basement is unfinished as long as you have supply registers in room it wont build up neg pressure just recycle it through furnace and when ac is on it will remove the moisture and in winter the air is dry and furnace dries it out more
AlexG
Valuable Member
I installed 110 CFM humidity sensing ventilation in my new fish room area. Once the room is finished it will be enclosed to keep the humidity trapped in a the fish room. The ceiling will be covered in plastic in that area. I am hopping to make a slight negative pressure in the fish room area to draw air into the space from the rest of the basement. The only tanks with opens tops will be the displays. I can see how a high CFM ventilation system can create a problem in a smaller basement space and that should be a consideration when adding ventilation.
