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BC-1203. Ventilation. This section establishes the types of spaces for which natural ventilation will be required, standards for the openings through which natural ventilation is provided, standards by which mechanical ventilation can be provided in lieu of or in supplement to natural ventilation, and the exceptions by which no ventilation is required.
Standards for ventilating attic spaces are included in this section. The current code does not establish standards for ventilating attic spaces.
Minimum requirements for the sizes of openings to provide natural ventilation are established in this section. The current code utilizes an indexing system to determine minimum requirements for ventilation in volumetric terms of outdoor air supply and
exhaust. This section adapts language from the HMC and MDL for minimum requirements consistent with the current code.
This section allows for spaces to be ventilated through an adjoining space, provided that the minimum requirements are met. The equivalent does not exist in the current code. Moreover, the current code actually prohibits ventilation through adjoining spaces in non-residential occupiable spaces. However, this section requires all habitable spaces to be ventilated through natural means as is required by the current code and consistent with the HMC and MDL.
The ventilation requirements for basements and cellars are not explicitly stated in this section. Instead, the text references sections in the HMC and MDL for those requirements. The current code addresses ventilation in basements with equivalent provisions.
The provisions for the ventilation of residential bathrooms and kitchenettes are similar to the current code with the exception of certain details that are not explicitly defined as in the current code and, instead, reference the HMC, MDL, and Mechanical Code.
The requirement for the maximum depth of room is similar to the current code, but also incorporates exceptions derived from the HMC and MDL
The requirements for exhausting contaminant sources in naturally ventilated spaces references the Mechanical Code. The current code addresses the issue of contaminant exhaust in several different subchapters throughout the code.
The current code equivalently requires mechanical ventilation for bathrooms as this section, except that this section includes the mechanical ventilation requirement for rooms in occupancies other than R and I-1 that contain bathtubs, showers, spas and similar bathing fixtures.
The provisions governing openings onto yards and courts are similar to the current code, but also address the issue of recesses by incorporating provisions from the HMC.
This section defines the method for measuring openings. This language has been adopted verbatim from both the HMC and MDL. The equivalent is not found in the current code, but is used in current practice.
The provision governing the height of openings has been adopted from the HMC, with an exception for habitable mezzanines. The equivalent is not found in the current code, but is used in current practice.
All other provisions in this section are equivalent to the current code.