Can You Run Two Bathroom Fans Together

I have two adjacent bathrooms one of which has an exhaust fan that vents through the roof. 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. 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.

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The typical problem is that odors can migrate from one bathroom to another.

Can you run two bathroom fans together.

It is basically a fan in a box with 3 to 4 ports on the side. 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. Can i tie two bath exhaust fan vents together. The above scenario will work provided the following.

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. Then add an inline fan to the remaining leg of the y adapter and run ducting to vent outside. Was replacing bathroom fan 1 and while it was disconnected from its duct pipe the fan in the bathroom 2 was on and.

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. You can replace the fan opening with a grill for each washroom. I felt air coming from bathroom 2 s fan down through the metal duct pipe for venting bathroom 1. Connecting bath exhaust ducts together can result in problems.

An additional option is to use the cvs series fan from fantech. I plan to add a fan to the other bathroom but want to avoid drilling a hole in my roof. When inline fan is in operation air from both washrooms will vent out. I vote to keep the ducts separate.

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