Can You Run Two Bathroom Fans Together

Can i tie two bath exhaust fan vents together.

Can you run two bathroom fans together.

The 2 fans have their own ducts but just before they vent out the roof their duct pipes are attached to a common duct upside down y which means they vent out the same hole in. You can replace the fan opening with a grill for each washroom. 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. 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.

I have two adjacent bathrooms one of which has an exhaust fan that vents through the roof. The above scenario will work provided the following. 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. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it.

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. The typical problem is that odors can migrate from one bathroom to another. I felt air coming from bathroom 2 s fan down through the metal duct pipe for venting bathroom 1.

An additional option is to use the cvs series fan from fantech. Both washrooms must have nearly identical square. When inline fan is in operation air from both washrooms will vent out. It is basically a fan in a box with 3 to 4 ports on the side.