Can You Run Two Bathroom Fans Together

Connecting bath exhaust ducts together can result in problems.

Can you run two bathroom fans together.

I felt air coming from bathroom 2 s fan down through the metal duct pipe for venting bathroom 1. You can replace the fan opening with a grill for each washroom. If you are using pbh or pbl grilles grilles with built in lights the light is usually controlled by a separate light switch or switched along with other bathroom light fixtures. I have two adjacent bathrooms one of which has an exhaust fan that vents through the roof.

Was replacing bathroom fan 1 and while it was disconnected from its duct pipe the fan in the bathroom 2 was on and. When inline fan is in operation air from both washrooms will vent out. I plan to add a fan to the other bathroom but want to avoid drilling a hole in my roof. Can i tie two bath exhaust fan vents together.

I vote to keep the ducts separate. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it. Both washrooms must have nearly identical square. The classic example occurs in multifamily units if one tenant is a smoker the tenant next door can smell tobacco smoke that enters the bathroom through the exhaust fan.

Then add an inline fan to the remaining leg of the y adapter and run ducting to vent outside. It is basically a fan in a box with 3 to 4 ports on the side. The typical problem is that odors can migrate from one bathroom to another. If you have two bathrooms that are close together and one has an exhaust fan and the other doesn t you might be wondering if you can tie a new exhaust duct into the existing one.