CABO      

  MHCSS

Light and Ventilation

Requires half of required glazing to be operable, except when a mechanical ventilation system capable of supplying 15 CFM is provided.

Mechanical ventilation may be omitted in bathrooms with 1.5 sf of operable glazing

Does not require kitchen ventilation to vent to the outdoors.  Allows unvented range hoods.

Requires half of required glazing to be operable regardless of mechanical ventilation requirement.

Requires all full bathrooms and separate toilet compartments to have mechanical ventilation.

Requires kitchen ventilation capable of providing 100 CFM to the outdoors.  Exhaust fan must be located within 10' of range or cook top.

CABO

MHCSS

Room Sizes and Ceiling Heights

• Habitable rooms not less that 70 sf.
• Minimum dimension in habitable rooms not less than 7'.
• In habitable rooms, ceiling height not less that 7'-6" over 50% of room area. Remaining area 5', minimum.  Beams, girders, and ducts may not project more than 6".

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Room sizes and heights:

• Habitable rooms not less than 50 sf.

CABO

Glazing

Requires safety glass in any panel greater than 9 sf., whose bottom edge is less than 18" from the floor, and is within 36" of a walking surface.

Exempts a mirror mounted or hung on a door.

Does not require shutters or other protective coverings for windows or doors in high wind zones.

MHCSS does not address.

Requires safety glass in unbacked mirrored wardrobe doors.

Requires walls, window and door surroundings to be designed for placement of shutters or other protective coverings in high wind zones.

Exits, Doorways and Egress

Conforming exit doors no less than 3' wide and 6'-8" tall.   Hallways no less than 3' wide.

CABO does not address. 

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On windows designed for emergency egress, sill height no more than 44" high.   CABO does not limit height of operating hardware, or require operating instructions posted on the window.

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Conforming exit doors no less than 2'-4" wide and 6'-2" tall.   Hallways no less than 2'-4" wide.

Egress doors not to be located in a room with a lockable interior door.  Includes several other provisions relating to required hardware for interior and exterior doors.

On windows designed for emergency egress, sill height must be no more than 36" high, with operating hardware not more than 54" high.  Operating instructions must be permanently posted on the window.  Each bedroom must have an egress window or an exterior door.

Smoke Detectors

Requires smoke detectors to be interconnected, and to have a battery backup.

MHCSS does not address.

Limits the use of foam plastic interior trim.

Limits smoke density of interior finishes to 450.

Limits flame spread classifications of walls and ceilings to 200.   Does not address other  configurations.  

CABO does not address. 
Requires flame spread rating of 75 or less and smoke-developed rating of 450 or less for foam plastic thermal insulating materials. Requires additional spread ratings and smoke density factors for types of insulation materials other than foam plastic.

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Does not limit the use of foam plastic interior trim.

Does not address smoke density of interior trim.

Limits flame spread classifications of walls to 200 and ceilings to 75.   Provides additional flame spread ratings for specific components of kitchen and bathrooms.

Requires "limited combustible materials" adjacent to cooking ranges (maximum flame spread rating of 50), and doors and enclosures around furnaces and water heaters (maximum flame spread rating of 25).

Requires flame spread rating of 75 or less and smoke-developed rating of 450 or less for foam plastic thermal insulating materials.