Section 150.710 - Ventilation Systems(A) Positive mechanical exhaust ventilation shall be provided, regardless of natural ventilation, and must be capable of assuring the minimum number of air changes per hour for the following areas as required under the provisions of the M.G.L. c. 111, § 72C:(1) Kitchens, dishwashing areas and diet kitchens shall have at least ten air changes per hour.(2) Bathrooms, toilets and showers shall have at least ten air changes per hour.(3) Rooms for soiled linen shall have at least ten air changes per hour.(4) Utility rooms, janitor's closets, laundry rooms and nurse's stations shall have at least ten air changes per hour.(B) All storage rooms, including food storage rooms, oxygen storage rooms, boiler rooms and rooms in which mechanical equipment is stored, shall have separate and independent venting systems providing not less than ten air changes per hour.(C) Ducts for ventilating bathrooms, toilets, rooms for soiled linen, laundry rooms and garbage storage rooms shall not be interconnected with other duct systems, but shall lead to the outside independently.(D) All ducts penetrating floors or fire rated walls shall be fire dampered at the point of penetration.(E) Corridors and exit halls shall not be used as plenums for the supply or return air to heating or air conditioning systems.(F) Exhaust air intakes or hoods shall be located at cooking, dishwashing and high steam of fume-producing areas.Adopted by Mass Register Issue 1361, eff. 3/23/2018.