Any bath remodelers on board?

Looking to install a bath exhaust fan.
One question is, how long can I run a 4" duct. using a 60-80 CFM fan.
Based on the joist config., I would have to run about 13' to the nearest outside wall.
Another question is can I safely cut a 4" hole in a 2 x10 rim joist in order to pop through the wall.
I tried asking the good folks at my local big box and all they could say was " it should work."
Any advice would greatly be appreciated.
Thanks.

 

I found this.

https://diy.stackexchange.com/questions/10657/what-are-the-guidelines-for-holes-in-joists

It's your place, so basically you can do what you want. Maybe check with the local zoning/building officer. Mine lives down the street from me and has been more helpful with questions.

 

Depends on code in your state. They all vary.

 

The length should be fine as long as you’re maintaining fall so water doesn’t accumulate in the line. I have my vents on a timer so they typically stay on 15-20 mins after my shower is done. That gives it ample time to pull the moisture plus dry up any condensation that may be in the line. Also, insulating the duct is a must.

Structurally, Going through the rim joist shouldn’t be too much of an issue as your joists are baring most of the load on the foundation wall. Wouldn’t hurt to reinforce with an additional board around the cutout. Just make sure you seal the hell out of the duct at the hole inside and outside.

But like others said, check local code.

I’m not a professional but have done my fair share of diy home remodeling.

 

This info is good to know. I'll be doing a bathroom remodel soon.

 

Thanks guys, I will definately check with the code officer just to make sure.
I too read that the rim joist is looked at differently compared to a spanning joist.
Yeah, good thought about pitching the duct downwards slightly for condensation.

 

If you are talking about in the attic, I have always run them over to the soffit with a soffit mounted spring loaded vent.

 

No, I wish it could be through the attic. This will be going in first floor ceiling of a two story.

 

BTW. Do yourself a favor and buy a good fan. They're expensive but totally worth it IMO. Panasonic makes really good fart fans.

 

Yes, been scoping out Panasonics line of Whisper EZ bath fans.
They look to be designed very well and have been suggested to me by others.

 

typically fart fans will push 75' .. reduce 3' for each elbow.
cutting rim.. no worries

be smart .. if the fan is of some age.. replace the fan while things are open.

consider a fan/light combo that will allow heat lamp bulbs