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Re: Bathroom Exhaust Fan
The IMC (all ICC codes) only started in 2000.
The ICC was formed when the Southern Building Code Congress (SBCCI) joined with several other model codes in an effort to combine the various codes into the one ICC code set.
The SMC (Standard Mechanical Code), which was the SBCCI mechanical code, covers this in the following (note, though, I do not have back to 1982, just back to 1991):
- M503.3 LAVATORIES, TOILETS, BATHROOMS AND RESTROOMS
- - M503.3.1 Air exhausted from bath, toilet, urinal, lavatory, locker, coat room or similar rooms shall not be recirculated unless treated by a listed or approved air treatment system.
- - - EXCEPTION: Air within a room that contains a bathtub and/or shower shall not be recirculated and shall be mechanically exhausted to the outdoors.
- - M503.3.2 Where natural ventilation or an approved air treatment system is not provided, 2 cu ft of air per minute per sq ft (10 L/s/mē) of floor area shall be exhausted from lavatories, toilets, bathrooms and restrooms.
- - - EXCEPTIONS:
- - - - 1. For lavatories, toilets, bathrooms, and restrooms in one and two family dwellings, exhaust air may be reduced to a minimum of 1 cu ft per minute per sq ft (5 L/s/mē) of floor area.
- - - - 2. For private toilet rooms with not more than one water closet and one lavatory, exhaust air may be reduced to a minimum of 1 cu ft per minute per sq ft (5 L/s/m2) of floor area.
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