Can You Run Two Bathroom Fans Together

When inline fan is in operation air from both washrooms will vent out.

Can you run two bathroom fans together.

The typical problem is that odors can migrate from one bathroom to another. Can i tie two bath exhaust fan vents together. I have two adjacent bathrooms one of which has an exhaust fan that vents through the roof. It is basically a fan in a box with 3 to 4 ports on the side.

Both washrooms must have nearly identical square. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it. Then add an inline fan to the remaining leg of the y adapter and run ducting to vent outside. You can replace the fan opening with a grill for each washroom.

The above scenario will work provided the following. 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. I vote to keep the ducts separate. I plan to add a fan to the other bathroom but want to avoid drilling a hole in my roof.

I felt air coming from bathroom 2 s fan down through the metal duct pipe for venting bathroom 1. 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. Connecting bath exhaust ducts together can result in problems. 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.