Commercial Bathroom Exhaust Fan Code Requirements

Table 403 3 2 3 minimum required local exhaust rates for group r 2 r 3 and r 4 occupancies for si.

Commercial bathroom exhaust fan code requirements.

50 cfm intermittent or 20 cfm continuous operation 2006 irc 303 3x. The illustration above demonstrates the use of a ceiling exhaust fan mounted in the rest room exhausting the stale air. Every bathroom requires an openable window that provides at least 1 5 square ft of air flow area when open 2006 irc 303 3 or mechanical type ventilation. This exhaust air can be routed either to the roof using ductwork and a roof vent or to the side of your building using ductwork and a hooded wall vent.

Spaces meeting exhaust requirements of bathrooms are exempted from above provisions. The exhaust from a bathroom or kitchen in a residential dwelling shall not be considered to be a hazardous or noxious contaminant. 25 or 50 cfm ft for hotels motels resorts and dormitories and a slightly more modest 20 50 cfm for private dwellings. Each bathroom should have a circuit for lighting and an exhaust fan.

Air inlets must be at least 10 feet with exceptions from known contaminant sources and protected from snow with rodents and insect screens. Required bathroom vent fan ventilation rate in cfm. Bathrooms must have windows when this section is adopted by a community it essentially says that for venting purposes bathrooms must have windows that open. According to the code this circuit may be a 15 amp circuit if it serves just lighting but it should be a 20 amp circuit if it is also serving a vent fan.

This ventilation code specifies a bathroom exhaust airflow rate for toilet rooms and bathrooms not served by a window of adequate size of. Bathroom exhaust fan venting code summary section r303 3. Where a source of contaminant is located within 10 feet 3048 mm horizontally of an intake opening such opening shall be located a minimum of 2 feet 610 mm below the contaminant source. 1 cubic foot per minute 0 0004719 m 3 s.

General lighting fan circuit required. A commercial restroom will require air to be changed 8 12 times an hour depending on the size of the facility and your local code.