We would like to turn down the airflow in our spray booth during non-spraying times (i.e. warming it up in the morning). There is no specific airflow requirement for non-spraying modes such as prep or unoccupied times. Generally, users will revert back to standard building […]
Code Compliance: Only one of the standards (EPA’s 6H Rule) that we see applied to spray booths addresses booth pressure specifically. One of the purposes of a spray booth is to confine and capture the overspray. While the spray booth’s ability to do this may […]
I’m considering installing a new paint booth at my facility. I have the option between a semi-downdraft booth (equipment is to heavy for a down draft type booth to support) and a crossflow booth. I was wondering what the pros and cons are to each type?
Downdraft is considered the best airflow and finish quality. Usually the most expensive. We can put pits on both sides of the booth, called a dual pit. Leaves the center of booth concrete to support the product. Side downdraft is next in quality / cleanliness. Typically second in expense. Both of the above and the semi downdraft are taller than a crossdraft by 3’ to 4’ Crossdraft pulls the air length wise thru the booth. This pulls over spray over the product and much of the over spray also falls to the floor, not getting to the filters. The semi-downdraft we use in our refinish product line is similar to a crossdraft as the exhaust filters are on the end of the booth. Many times the airflow in the booth is determined by the space available for installation also.
This is a tough question to answer, as they are many different “types” of paint booths in terms of airflow style, cabin design, ceiling and pit design, size and features. Booths can be completely enclosed or open in the front. There is also the main […]
It depends. NFPA 33 requires that booths shall be separated from other operations by a minimum distance of 3 feet or by a partition or wall having a minimum fire resistance rating of 1 hour. This allows access for cleaning and maintenance and minimizes the potential for the spread of fire. However, you may connect your spray booth directly to your oven so product can be moved directly from one to the other. If you do, interconnecting doors shall include an interlock to prevent spraying if the doors are open. A high-temperature limit is required in the spray area to shut down the oven heating system if the temperature in the booth exceeds 200 degrees Fahrenheit. If your process does not allow for interconnecting doors, then you need a pressurized vestibule between your booth and oven. The vestibule must separate the booth from the oven by at least 3 feet. Airflow into the vestibule must be proven so that a loss of airflow shuts down either the oven heating system or the spray application equipment.
Breaking down overspray on booth walls: Power wash with warm water, soap, and a stiff broom brush or plastic scraper, or sand walls with 120 grit sandpaper, and then maybe 240 grit. Sweep or vacuum floor to remove excess dirt. (If using a vacuum, make […]