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When two or more fans in a dwelling unit share a common duct, each fan shall be equipped with a backdraft damper to prevent recirculation of exhaust air into another room.

Related Code Sections

R403.5.8 [RE] Residential Energy Efficiency, Multifan Systems
When two or more fans in a dwelling unit share a common duct, each fan shall be equipped with a backdraft damper to prevent recirculation of exhaust ...
R403.5.8 [RE] Residential Energy Efficiency, Multifan Systems
When two or more fans in a dwelling unit share a common duct, each fan shall be equipped with a backdraft damper to prevent recirculation of exhaust ...
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Except as otherwise provided in this code, no plumbing system, drainage system, building sewer, or part thereof shall be located in a lot other than ...