I need some advice on replacing the exhaust fan in our upstairs bathroom. After dealing with mold remediation, I've learned how important home health is. The current fans, dating back to the 90s, vent into the attic, which I know is not ideal. I'm focused on installing a new fan in our hall bath, located at the front of our house. I really don't want any visible vents on the front side of the roof. I know there are codes about vent pipe lengths, and that 90-degree bends reduce efficiency, but I'm unsure if venting through the back side is possible. Are there alternative venting options to consider besides going through the roof? I can't find much info online. Thanks for any help!
4 Answers
I don’t have an exhaust fan in my bathroom at the moment, but when I do get a new roof, I plan to install one. For now, I just use a dual fan in the window. I run it on full exhaust while showering, and switch it to air exchange when the door is closed. If I'm leaving the house and want to keep the window shut, I just move the fan to the doorway to circulate air. Squeegeeing the shower walls helps the room dry out faster, too!
Venting through a wall is definitely an option, but you need to check if you have vented soffits and how close the fan vent is going to be. Using a 6-inch duct will give you a better distance, and quieter operation. If your fan has a 4-inch outlet, you could use an adapter to connect it to a 6-inch duct. For more guidance, here's a helpful video: How to Vent a Bath Fan Through the Roof.
Sounds like you want a vent but aren't keen on where it should be. Why not just put it where it works best?
You might want to consider venting through the soffit. Just make sure to block off any soffit vents that are leading into the attic for about 3 feet on either side of your fan to prevent any warm, moist air from going up there. I've done this in my 62-year-old house, and it's worked out fine! You could also vent through the gable end of the house if that’s another option for you.
Good point, but I’m just looking for alternatives that don’t mess with the house’s curb appeal!