What are the potential hazards when painting with the doors open?
“We are using a spray gun between 20-60 psi when the production doors are open on the unit. Do the filters on the doors provide a significant protection factor when dealing with Isocyanates?”
The paint booth should have the doors closed during paint spraying. The velocity through the filters in the door should keep all vapors and overspray confined to the booth. You should avoid spraying any paint directly at the intake filters.
With the doors open the booth becomes an open face booth. You may need to adjust airflow rates to ensure that you have enough capture velocity through the opening to confine the vapors or overspray to the booth. Typical face velocities for an open face booth range from 100 to 150 feet per minute, but may need to be higher for your application.
If you are concerned about the concentration level of Isocyanates outside the spray booth, we suggest you contact an Industrial Hygienist. They can perform the necessary sampling tests to determine what the exposure levels may be.