What room dimensions require a sprinkler system to be required by fire or safety code for temporary spray booths?

The local and state Fire Marshal of your state set this requirement. Check your local city or state’s building code office.

Determine you classification group that your structure falls into. Then depending on this, the like above will provide guidance when a sprinkler is required. For example, when a Group S-1 fire area exceeds 12,000 square feet, an automatic-fire sprinkler is required. Temporary structures may fall within several groups or none at all. So, the Fire Marshal will be your best resource to pinpoint the requirement you’ll need to follow. Many temporary structures and storage areas that don’t have regular occupancy of people are exempt from fire-sprinkler requirements — but double check with your Fire Marshal’s Office. OSHA does require fire sprinklers for certain work areas, such as if a structure meets the definition of a spray booth, then it is required to be equipped with approved automatic sprinklers on the upstream and downstream sides of the filters per 1910.107(b)(5)(iv). But OSHA requirements for having a sprinkler are based off of certain workplace hazards being present.