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Protecting your employees who work in and near spray booths begins with recognizing the risks. Because these booths introduce fire and explosion hazards, it’s crucial that you establish and frequently reinforce safety practices with your team.

As you assess your spray booth safety plan, refer to the tips below to help you meet the requirements and guidelines outlined in National Fire Protection Association (NFPA) 33: Standard for Spray Application Using Flammable or Combustible Materials.

Design and construction

• Use non-combustible materials (e.g., 18-gauge metal or masonry).
• Ensure doors are vapor-tight with gaskets or sills high enough to contain vapors.
• Install automatic shutoffs that interlock with spray guns if doors are opened or if ventilation fails.
• Keep interiors smooth to prevent residue buildup and make cleaning easier.
• Maintain adequate access and exits for employees working in the booth.

Ventilation

• Ensure ventilation systems can remove vapors and confine combustible dust and deposits.
• Keep vapors below 25% of the lower explosive limit (LEL).
• Maintain a velocity of 100 cubic feet per minute across the face of the booth.
• Use spark-resistant fans with non-ferrous blades.
• Continue running ventilation fans during and after spraying until all vapors are gone.

Electrical wiring

• Ensure components inside the spray booth and within three feet of it are UL-listed and Class 1, Division 1 rated (NFPA 70E).
• Use explosion-proof lighting that’s sealed behind wired glass and a vapor-tight seal.
• Ensure all metal elements, including ducts and other equipment, are properly grounded.

Fire suppression

• Install a professional automatic sprinkler or fire suppression system and have it serviced annually.
• Protect sprinkler heads or nozzles from overspray residue with lightweight paper bags, and replace bags often.
• Keep a Class B, dry chemical, or CO₂ fire extinguisher nearby.

Incorporating these strategies into your spray booth operations can help make your workplace safer for everyone.

As a FEMA member, you have access to Sentry’s collection of safety resources at farmequip.org/member-resources/safety. You’ll need your member log-in credentials to access these resources. Sentry also has several safety webinars offered throughout the year that you can register to attend. To review the full list of webinar topics, go to . 

For questions regarding Sentry’s safety resources or webinars, please contact Bryant Hintz at bryant.hintz@sentry.com.

Safety services are provided by an affiliate of Sentry Insurance Company, Stevens Point, WI. For a complete listing of companies, visit sentry.com.

The information contained in this document is of a general nature and is not intended to address the circumstances of any particular individual. IT IS DISTRIBUTED “AS-IS,” WITHOUT ANY WARRANTIES. NO MEMBER OF SENTRY INSURANCE GROUP WILL BE LIABLE TO ANY PERSON OR ENTITY WITH RESPECT TO ANY LOSSES OR DAMAGES CAUSED, OR ALLEGED TO HAVE BEEN CAUSED, DIRECTLY OR INDIRECTLY BY THIS DOCUMENT, REGARDLESS OF WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, TORT (INCLUDING NEGLIGENCE AND FOR PROPERTY DAMAGE AND DEATH) OR OTHER GROUNDS.

40-1870 | 5224841 | 2/25/2026

| Member since 1974