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  • Enclosure
  • Visible Difference
  • Thermal Conservation

1.3.2.a Enclosure


Spray booths are often called "tin boxes", meaning there is not very much visual distinction between one spray booth and another. Nothing could be farther from the truth.


While it is true that spray booths tend to be box-like in their form and shape, the quality of the construction of these cabins and accessory equipment can either help the finisher achieve world-class finishes, or create additional problems in themselves.


A side-by-side comparison clearly reveals the details that enhance booth construction quality in "The Visible Difference".

In addition, one hears that single skin booths lose heat. Our research into thermal conservation has totally debunked that myth.




1.3.2.b Enclosure


The Visible Difference








Our door is assembled with screws, and like the rest of our equipment, is carefully constructed to last a lifetime.



Their door assembly, like much of their booth overall, is constructed of parts welded together, which rusts over time.



Clean, smooth construction and finished look.



The many welded facade joints create an uneven appearance.



Our precision-fit filter frame keeps out the dirt and contributes to overall airflow integrity.



Watch for poorly-fitted filter frames, which create gaps through which contamination can enter the booth interior.



Our door and handle are solid steel construction, very sturdy, smooth and refined.








Their door handle is a tubular bar bolted to the welded door frame.



Our sturdy latch is bolted to the door and is fully adjustable



Their latch is attached to a plate which is then welded to the door and provides little or no adjustment.





Our mix room has built-in spill containment and an exhaust fan which carries away fumes.











Pit in mix room floor is this manufacturer's approach to spill containment. Note the fan in the pit, placed there by the customer to eliminate the fumes which collected in his pit. Pit style adds $500 to mix room cost.




1.3.2.c Enclosure


Thermal Conservation


It's a never-ending debate: insulated vs. not insulated. Without insulation on the booth, you lose big bucks because you lose a lot of heat, right?

Our research into thermal conservation answers that question once and for all.


  • Heat Loss Test
  • Heat Loss Data
  • Temp Comparison
  • Heat Loss Formulas
  • Where to Insulate


1.3.2.d Single Skin Booth Heat Loss Test


To better understand the true difference between single skin and insulated skin heat retention capabilities, we performed a test which included creating a means of collecting the heat generated from the skin of an insulated and a non-insulated booth and measuring it.

Test Tools


-Special test box created from Plexiglas to capture the heat radiating from the metal surface
-Metal surface temperature gauge
-Digital dual probe thermometer


Test Conditions


-Building room size 18' x 30' x 45'
-Test booth size 24' x 14' x 11'
-Plexiglas test box size 8½" x 11" x 4"
-Room temperature 76° F
-Test time frame 35 minutes
-Bake cycle temperature 140° F
-Heat Loss Test


These steps were taken to conduct the test:


a) Measure:
• room temperature (ambient).
• booth metal skin temperature.
• booth temperature.
b) Place Plexiglas test box with digital thermometer on the side of the booth. Then place the metal temperature gauge on the booth skin, inside the test box.
c) Run the bake cycle of booth for 35 minutes and record the results in three-minute increments, including skin temperature, test box temperature, building temperature, and booth temperature.


1.3.2.e Heat Loss Test Data


The following graph shows the results of this test:



1.3.2.f Temperature Comparisons



Despite the fact that the temperature of the outside surface of the single skin booth rose, the air temperature around the booth remained a relatively constant 70°F.



1.3.2.g Heat Loss Formulas and Calculations

(Ambient temperature rise calculation)


In order to calculate the heat loss from the single skin booth, the following equation is used:







1.3.2.h Where to Insulate


Our tests have shown that areas that are in the direct path of air flow will see high temperatures.

This is due to the air's ability to penetrate the thermal boundary layer. The closer to the burner this occurs, the higher the metal temperature will become. This would include most, if not all, of the ductwork and any plenum type of arrangement.


Based on all the data, insulating all of the intake and exhaust ductwork is a good idea. Insulating the fresh air intake helps reduce condensation during winter months.


The tests are conclusive that the side walls of a spray booth do not require insulation to conserve energy. Key areas to consider insulating are the ductwork and plenum. This will maximize energy conservation and give the best return on investment.




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