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  • Workplace Safety
  • Paint Zone Exposure
  • Sound Level Management

1.2.5.a Workplace Safety

Hazards Resulting From Improper Operation of the Spray Booth

Principle hazards, which can result from improper application technology used in the booth, (for example, wheel covers already coated in paint thrown in corner of booth between uses, then reused), improper balance or insufficient maintenance are:

Danger of fire or explosion: Chemical imbalance in the working area during the painting phase due to not turning the unit on, operating in the wrong phase (bake), or clogging of the filters.

Atmospheric imbalance in the environment caused by the emission of solids and airborne particles of the painting substance (other than those intended) due to the insufficient operation of the exhaust paint arrestor filters.

Danger of fire or explosion: If enough particulate accumulates in the booth, there is a danger of spontaneous combustion. In one situation, the booth sweepings were left in a neat little pile in the middle of the booth for the weekend, and workers Monday found that little pile smoldering.

Fire and explosion due to inadequate, or total lack of ventilation during the operating phases of the booth (painting, flash-off and bake).

A heavy buildup of overspray on the floor, in the ductwork, the heating system, or the pit, should be prevented. It could spontaneously ignite or ignite from some type of equipment malfunction.

Fire or explosion due to an improperly operating burner.


Actions Forbidden Inside the Booth

Preparing, mixing and/or storing solvents.

Storing containers for paints or solvents (even if empty), or rags and other objects which are spotted or stained with paint and/or solvents.

Wearing overalls or other articles of clothing which are spotted or stained with paint and/or solvents.


Using tools which produce a particulate spray (grinding or welding - which makes sparks!).

Applying booth coating with the booth in operation and with an approved spray device.

Using electrical devices of any kind.

Storing and/or consuming food and beverages.

Storing dangerous articles or substances (for example, spray cans).


Precautions To Be Taken Inside The Booth


Replace the filters as soon as necessary. It is important to reiterate that the excessive clogging of the filters will result in a decrease in the airflow, allowing particulate to harden and drop onto the painted surface, causing a dimple effect in the finish.

Clean and perform regular maintenance on all parts, which are subject to wear, such as blower, heat exchanger, burner, dampers, and all control devices.

Clean all ductwork as necessary.

All accessories (for example, air compressors, air dryers, breathable air systems, etc.) used in relation with the paint spray booth must be designed for use with spray booth systems and maintained per manufacturer's specifications.

1.2.5.b Workplace Safety

Protecting The Painter


The spray booth protects the painter or operator from toxic materials in only a small way. Instead, he counts on his protective suit and hood, respirator, and breatheable air supply to provide defense against harmful materials.

1.2.5.c Workplace Safety

Sound Level Management


Unmanaged sound in the booth area can reach 90 dBs or more. The very velocity of air creates sound that can reach or exceed safe levels. Airflow that is not laminar generates more noise by creating vibrations in the booth and duct structures.

Sound management technology provides a way of reducing noise levels, thereby improving the safety and quality of the working environment by reducing fatigue and creating an atmosphere where instruction can be communicated.


  • Sound Facts
  • dBA Comparisons
  • Sources of Booth Noise

  • Noise Reduction Methods

Sound is measured in decibels (dB.)
A change of one dB is detectable by the human ear.
An increase of 10dB is a doubling of the loudness



A train 100 meters away = 85 dB

A 50 kW electric motor = 90 dB.

A spray gun at 60 psi = 105 dB

A nearby jet taking off = 140 dB.

Threshold of human ear pain = 125 dB.

Exhaust Fan

The major noise producer on a booth system is its fan or fans. One 34" fan can produce about 60 dB.

Booth Walls
Booth Duct
Booth Roof

Unmanaged turbulent air travelling past booth walls and roof can cause the booth structure to vibrate and thereby, add to the noise level. Laminar air flow IS important in noise reduction.

Exhaust Fan


  • Mount fan outside building.
    Mount fan at ceiling of building.
    Allow no obstructions before or after fan.
    Do not mount offset or elbow right above the fan.
    Do not mount the fan directly on top of exhaust chamber.


Exhaust Duct


  • Caulk all joints.
    Attach to booth with flexible coupling.
    Add insulated exhaust mufflers - our testing indicates that two inline mufflers reduce noise by 2-3 dB.
    Avoid 90° bends - make the change in direction as gentle as possible to minimize turbulence (noise source in this case) as much as possible - for example, use a 22½° elbow + a straight section + another 22½° elbow = 45° turn, but minimizes turbulence, and therefore, noise.




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12731 Norway Road • Osseo, WI • 54758 • info@globalfinishing.com • 800-848-8738