How does one determine the proper CFM for the size of the bathroom?
1415550
BOB - check out this link. http://www.wikihow.com/Calculate-CFM-for-Bathroom-Fan
1415551
Go to www.efi.org add 20 min. timer to clear moisture in 10-20 min. The right model will empty cubic feet of bathroom 8 times per hour. ..plus a bit more power for long twisty duct work. Site features helpful graph. Seriously, if your walls and mirror stream water after a shower WITH your existing 70cfm fan for 6'X 10'X 8' and opening the window left ice on the exterior stucco walls,not ideal...150cfm power works better!
1415552
Bob, If venting just a enclosed toilet 80 CFM would be fine, But if your venting a standard 3 piece bathroom install a 110 CFM fan. Jetted tubs in Master baths I would recommend 150 CFM+ [pending size of room] and install a dehumidistat or timer to better control humidity. Hot tubs require twice the CFM for proper ventilation. My two cents!!!!!MarkInnovative HVAC Systems, Inc.
1415553
Honestly, you can't have too large a fan. Who wouldn't want humidity from a shower and bathroom odors gone as fast as possible! 150 cfm is very adequate!
1194012
I recently put an 80 cfm fan in a powder room that is also about 5 x 7 with 8 foot ceiling on main floor of two story house (length of ductwork makes some difference). I think that was a little bigger than the recommended size (I saw anywhere from 5 to 8 minutes recommended to remove the room air volume) but I didn't want to go too small. 80 cfm is plenty. Drawback of going bigger is need for larger diameter duct to make use of the fan power, a little more noise from a larger motor, and less energy efficient both due to motor and to pulling more heated or cooled air out of the house.
618975
We are using it in a small bathroom about 7'X7', it is very efficient but a bit louder than I planned on.I hope this helps, my best,Gary
1510225
I cannot measure that because sink is already installed. Too much plumbing and water filter stuff in the way. Sorry, Bob
404977
Ask you plumber. But I used the small one. EX08CP. Works fine and great as supplemental heat in a boot room/entrance area for me.
1602057
I don't believe the installation instruction specify a figure but more space is better for cooling air flow. More space may allow for less usage of the cooling fan.
434210
Your best bet would be to go to : http://www.nutone.com/products/product-line/bath-and-ventilation-fans Here they can be sure to give you the right answer
1757539
Well it is hard to say exactly, as I do not know your conditions. Measure your space and and compare with the measurements listed.
1643786
I would try the Broan 690 60 CFM Bathroom Fan Upgrade Kit. You can check it out on Amazon. It's a pretty good deal (includes a new style cover for older units). I've used these upgrade kits on several units and they're easy to install and so far (I've had mine about 3 years) they have been working very well. Hope this helps.
1866854
I have a 630 sq ft. bathroom and had the fan installed and vented by an electrician, but it just does not seem to move the air quick enough. I also painted the bathroom, but now the walls look like a melting candle, with the steamy water dripping and causing the paint to bleed. What gives?
2165071
The small bathroom that I use my Gurin Electric Compact Dehumidifier is approximately 6' x 6' with a shower, two sinks and a toilet. It works beautifully in that room. It works so well that we no longer put the fan on when showering. My only complaint is that the electric plug gets very hot after being plugged in for 10 minutes or more. I have to unplug it at night and when we leave the house for fear of an electrical fire. Linda D. Florida
2109636
Occupants has nothing to do with this question , it's gallons per minute{ GPM} The hot water flow that you need is what you need to know, Input water temp. has little effect when buying like I do, With a bucket measure the water flow at a shower if it's 1.5gal a minute then buy a 3GPM unit and you will love it like I do mine. Remember over kill is best
600161
Depends on the load (ie what it is conected to). in our configuration we are getting about 200 cfm
1294641
I would think that info would be on their website. My bath is about 8 x 12 and it works fine. I don't think it would work well in a very large bath without central heat vents. It does have a powerful fan and is quiet. Wish I hadhad purchased the one with the light and night light.
652900
My bathroom is not very small and this exhaust fan works very well. Room size approx. 8' x 9'.
522737
Not sure, probably about 200 + cfm, I know it's strong enough to be felt 3/4 the way across my garage
556619
You measure the size of the grill, either inside diameter (duct) or the grill face itself in inches converted to square feet use the ft/min to determine cfm. Some companies use a duct that is modified to fit over the exhaust tubing and convert the exhaust or intake to a circular dimension and then take measurements. Multiple measurements are necessary on a grid pattern, at least 20, which are averaged and taken about 6 inches from the grill face at 90 degrees to the flow. Readings will vary upwards of 10 percent. For accuracy, it is a good practice for one person to measure the flow and the other to write down the data, plus use the averaging method on the instrument itself. The two person rule is a good idea for working off a ladder. The average cost on a call out plus the certified report averages about $1,000, so the anemometer is very handy to check and balance the system prior to having a certified technician do a survey.