Code of Massachusetts Regulations
105 CMR - DEPARTMENT OF PUBLIC HEALTH
Title 105 CMR 410.000 - Minimum Standards of Fitness for Human Habitation, State Sanitary Code, Chapter II
Section 410.280 - Natural and Mechanical Ventilation

Universal Citation: 105 MA Code of Regs 105.410

Current through Register 1531, September 27, 2024

The owner shall provide for each habitable room, and room containing a toilet, bathtub or shower, ventilation to the outdoors consisting of:

(A) windows, skylights, doors or transoms in the exterior walls or roofs that can be easily opened to a minimum of 4% of the floor area of that habitable room or room containing a toilet, bathtub or shower, provided, that a skylight which if open exposes the interior of the dwelling to direct rainfall shall not satisfy this requirement; or

(B) Mechanical ventilation capable of exhausting air at the following rates:

Occupancy Classification

Required Air Changes Per Hour

Habitable rooms other than bath, toilet or shower rooms

2

Bath, toilet or shower rooms

5

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