FAQs

Is there specific guidance where a particular zone starts, or is the whole booth regarded as one zone?

Is there specific guidance where a particular zone starts, or is the whole booth regarded as one zone?

We are a joinery company and have a booth with a 3.0m wide dry back extract for lacquer finishing. Our insurance company has raised concerns regarding the zoning within the room. In both the US and Europe the interior volume of a spray booth is […]

What type of spray booth is best, a reverse airflow or a front airflow?

What type of spray booth is best, a reverse airflow or a front airflow?

Reverse Airflow We recommend a reverse flow as a better design than a standard crossflow. The reason I state that is as follows. With a reverse flow design, the product entry/exit doors are located at the exhaust end of the booth. If there is any […]

What are the regulations regarding intrinsically safe electronic devices inside a paint booth?

What are the regulations regarding intrinsically safe electronic devices inside a paint booth?

If allowed, what type of certification and enclosure does a communications device require to go into a paint booth?

National Fire Protection Association

The interior of a paint spray booth or room must meet the requirements for a Class 1 Division 1 area as defined by NFPA 33 Standard For Paint Spray Booths and NFPA 70 Article 516 National Electrical Code. Intrinsically safe circuits are allowed in this area but must meet the requirements of NFPA 70 Article 504 Intrinsically Safe Systems.

What is the proper way to get an even finish when painting a metallic hood without getting the stripe effect when applying the clearcoat?

What is the proper way to get an even finish when painting a metallic hood without getting the stripe effect when applying the clearcoat?

Finish Application If the stripping is happening only after you start applying the clear coat it is possible that the basecoat is not completely flashed off when the clear in applied. This can cause the metallic to shift. Another possibility is that the basecoat has […]

How many air changes are required for a 16 by 14 by 40 paint booth?

How many air changes are required for a 16 by 14 by 40 paint booth?

Air Changes There is no code or standard that requires a specific air change for paint spray booths. It is more common for the ventilation performance of a spray booth to be specified by the average velocity through the booth or in the vicinity of […]

What is the best placement of sensor tubes coming from the magnahelic gauge for a downdraft paint booth?

What is the best placement of sensor tubes coming from the magnahelic gauge for a downdraft paint booth?

Measuring Pressure

The answer depends on what pressure differential you are trying to measure. If you are measuring cabin pressure compared to building pressure, the high-pressure sensor tube should be mounted in the cabin away from any booth openings. The low-pressure tube should be left open to the shop.

If you want to measure static pressure loss across the pit filter, the high-pressure sensor tube should be mounted in the cabin away from any booth openings, and the low-pressure sensor a few inches below the pit filters.

Are manometers or other pressure drop devices required by law on exhaust filters?

Are manometers or other pressure drop devices required by law on exhaust filters?

National Fire Protection Association A means is required to make sure that you are moving the required amount of air for paint spraying. Your choices depend upon the code or standard adopted by your local authority. If NFPA 1 Fire Code is being enforced then […]

What are the potential hazards when painting with the doors open?

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 […]

How do I maintain a specific spray temperature inside the paint booth?

How do I maintain a specific spray temperature inside the paint booth?

I live in Malaysia with the temperature of 32 degree Celsius, how do I maintain the spray temperature of 23 degrees Celsius inside the painting booth? Do I need to install a chiller and humidifier?

Due to the conditions in Malaysia the temperature set-point being asked for is at or below the dew point in the summer months. A chiller would be required to attain that temperature, but the outside walls of the booth may form condensate if the dew point of the outside air is at or above 23°C.

Humidity is a large issue in Kuala Lumpur, Malaysia. Cooling the air would cause for other conditions such as condensate on the booth walls or a high relative humidity in the booth since the air is being cooled down to the saturation temperatures in the summertime.

Standard design practice would be to condense the moisture out of the air by sub-cooling with a chiller and then reheating the air with indirect heat to the desired operating temperature and relative humidity set-point. This practice would be done only with the use of an insulated booth with a vapor barrier in the environment of Malaysia.

Is there a “magic number” on the manometer at which paint booth filters should be changed?

Is there a “magic number” on the manometer at which paint booth filters should be changed?

Regardless of the filter used, it is a matter of how much total resistance is designed into the fan in question and the relative condition of the fan. All fan units are designed to operate within a range of resistance, that includes the ductwork, plenum […]