Commercial Bathroom Exhaust Fan Code Requirements

Every occupied space shall be ventilated by natural means in accordance with section 402 or by mechanical means in accordance with section 403.

Commercial bathroom exhaust fan code requirements.

General lighting fan circuit required. 50 cfm intermittent or 20 cfm continuous operation 2006 irc 303 3x. Each bathroom should have a circuit for lighting and an exhaust fan. Bathroom exhaust fan venting code summary section r303 3.

Air inlets must be at least 10 feet with exceptions from known contaminant sources and protected from snow with rodents and insect screens. 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. 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. 25 or 50 cfm ft for hotels motels resorts and dormitories and a slightly more modest 20 50 cfm for private dwellings.

Local exhaust systems shall be provided in kitchens bathrooms and toilet rooms and shall have the capacity to exhaust the minimum airflow rate determined in accordance with table 403 3 2 3. 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. Spaces meeting exhaust requirements of bathrooms are exempted from above provisions. 1 cubic foot per minute 0 0004719 m 3 s.

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. Required bathroom vent fan ventilation rate in cfm. Table 403 3 2 3 minimum required local exhaust rates for group r 2 r 3 and r 4 occupancies for si. In lieu of compliance with section 403 1 through section 403 3 mechanical ventilation may be implemented in compli ance with ashrae 62 1.

This ventilation code specifies a bathroom exhaust airflow rate for toilet rooms and bathrooms not served by a window of adequate size of. The illustration above demonstrates the use of a ceiling exhaust fan mounted in the rest room exhausting the stale air.