Two Bathroom Fans One Duct

If you try to combine them into a common duct it will bring with it a number of problems including an unbalanced system with positive negative air pressures which play havoc with the fan motors and could cause motor failure.

Two bathroom fans one duct.

I vote to keep the ducts separate. Afaik if the fans you installed have built in dampers then you can wye them together and use one outlet without a problem. Each fan has a 6 flexible duct so i m thinking they d connect to a y then exit the roof. You should not put more than one fan into a common duct each fan should have its own duct run to atmosphere.

I m adding bathroom fans to two back to back bathrooms on a single story house. Can they share one t top going out of the roof. I just installed two panasonic bath fans in two adjacent rooms and joined them together in the attic it works fine with no backdraft from one fan to the other. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.

I felt air coming from bathroom 2 s fan down through the metal duct pipe for venting bathroom 1. Thanks for any info mike. But switching from corrugated duct to rigid duct is a good idea and gable terminations are better than soffit terminations. 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.

Was replacing bathroom fan 1 and while it was disconnected from its duct pipe the fan in the bathroom 2 was on and. Each fan vents separately out the roof. Each bathroom has its own exhaust fan.