Bath Exhaust Fans: DIY Size, Select, Install, Test, and Control

'Home Diagnosis' TV hosts Grace and Corbett Lunsford give a crash course in picking, placing, testing, and controlling bath exhaust fans. Learn what Home Ventilating Institute certification, sone ratings, Energy Star stickers and duct installs are all about, and make your home healthier.

[Buildingscienceacademy]

I do building diagnostics and we just replaced exhaust fans in a 2018 home that weren’t pulling enough CFM. Replaced all of them with Broane and the homeowner loves the quieter sounds and I love that they are effectively pulling out the moisture!

[REALITY_ONLY_PLEASE]

So much info! Thanks for taking the time to educate us.

[jeremyjedynak]

Thank you for answering all of these questions in a single video! I keep coming back to this video, again and again.

[TheLoner]

I ran 4 inch abs pipe from the exhaust fan. It's about 3' from an outside wall. It will remove all humidity in about 30 seconds. The smooth pipe makes it very easy to keep clean and naturally is more insulated than it's metallic cousin.

[coled]

This is such a great video. I see so many fans installed far away from the shower/tub or in a completely separate toilet closet. And even in more expensive homes, only the cheapest, noisiest fans tend to be used. IMO at least a 110 CFM fan with a 6” duct diameter should be used with a shower.

The fan should also be run 15-30 minutes after bathing to remove residual steam.

[JD-mmur]

and now good lucky finding someone locally who can install it correctly or fixing the wrong duct work without destroying the house

[fromtheburbstothetetons]

I like timer switches. I found my family wouldn't turn on the fan because they didn't want to hang around to turn it off. 5 minutes of fan time right after the shower always cleans out all the humidity.

[tylerhuff]

Dew point switch from home depot was the best purchase made. Set the percent and run time. I never think about turning on or off my fan

[anthonydo]

Thank you very much guys. You are such a great couple. I m running into a problem here, i want to install an exhaust fan in the bathroom on the first floor, the joints between the first floor and second floor run perpendicular to let me run the duct to the outer wall. what should i do? Thank you for your help.

[ANigerianPrince]

Hells yeah. Fantastic video. The best on the subject.

[jl]

Excellent vid. Thanks guys.

Do you have any suggestions on how to vent one when there is no attic space? Eg flat roof house? Thanks

[caseyhartman]

I've only heard the term "fart fan" used for recirculating fans and not exhaust ones. I saw that HVI's website recommends adding 50 CFM for each toilet, tub, and shower and 100 CFM for a jetted tub. I need an exhaust fan installed since opening the window doesn't feel like it helps humidity leave the bathroom while showering.

[jeremyotero]

Im a handyman, , an d i first looked at your video, and fell in love with your production and acting, , , , your funny words like fart, made me laugh, and the speed and choice of necessary words, was on point, and btw the pictures was very well approve very much i will subscribe and look for more
i do have a question i just installed a panasonic bathroom fan for a small bathroom and vented thru attic over to the gable vent on the side of house, bcus i dont want to go thru ceiling, or soffitt, , , and did not want to cut a hole thru house, so i went straight to vent and secured it very nice and the run is right at 20' with one 90 turn I used the flexable duct and it is as straight as i can get it, , , my question is, is this acceptable? we dont have to have insulation bcus we are in South Carolina and it doesnt get that let me Peace

[CoraD-ps]

My fan in the bathroom have dust packed around it. Can i use the vacuum to clean it.?

[cola]

Would like to know more techniques . How to wiring and how to measure line accurately on ceiling.

[davidbruce]

What about when you have an ERV. Do bathroom fans disappear?

[derj]

Have you ever used the Panasonic fans? I've heard good things about them.

[squeekhobby]

Excellent. Can you give pointers to connect exhaust to a hrv or erv

[mikhailarey]

S&P in line fans. They have been great. Does anyone use HRV for bathroom exhaust?

[dariod]

Sense-on-rise gives me nothing on google can we get a link or brand name please? Also have you solved drafty fireplaces? I’m mid construction trying to build an tight home.