Can You Run Two Bathroom Fans Together

Can i tie two bath exhaust fan vents together.

Can you run two bathroom fans together.

I have two adjacent bathrooms one of which has an exhaust fan that vents through the roof. An additional option is to use the cvs series fan from fantech. 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. Then add an inline fan to the remaining leg of the y adapter and run ducting to vent outside.

The typical problem is that odors can migrate from one bathroom to another. Was replacing bathroom fan 1 and while it was disconnected from its duct pipe the fan in the bathroom 2 was on and. It is basically a fan in a box with 3 to 4 ports on the side. 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. Connecting bath exhaust ducts together can result in problems. The above scenario will work provided the following. Both washrooms must have nearly identical square.

I felt air coming from bathroom 2 s fan down through the metal duct pipe for venting bathroom 1. I plan to add a fan to the other bathroom but want to avoid drilling a hole in my roof. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it. 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.