Automotive Paint Booth Series
The Leader in Clean Air. Guaranteed Solutions.
Spray Booth Airflows Overview
Manufacturing Today
Manufacturers are looking for a ventilation system that
should:
• Increase the Quality of their finished Product
(no dirt in the paint, no swirls, ect…)
• Reliability in fast, easy and convenient service
for their paint finishing system.
• Increase Flexibility in their finishing system.
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Spray Airflows Overview (continued):
•
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in the Industry.
•
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Maximize Quality Finishes’.
•
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Toughest Conditions.
•
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Solutions for every budget!
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Equipment Types:
Airflow Configurations
Style/Applications
•Downdraft
•Automotive
•Semi-Downdraft
•Woodworking
•Cross-Flow
•Custom Design
•Industrial
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DownDraft Paint Booths:
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Downdraft
(Dual Trench)
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DownDraft Airflow:
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Almost always the best “ten on a scale of one to ten”
Short path of overspray to exit
Overspray is pulled away from the painter and the product
Wrap of air movement around product is very efficient at removing
overspray and preventing dirt
Easily lends itself to “drive-through” applications, due to the plenums being
out of the product path
No “dry overspray” issues
Can often spray multiple colors without “cross-talk”
Provides excellent contact ratio of heated air to product during cure cycles
Typical airflow design is 50 FPM in direction of airflow (length x width x 50)
automotive is often 25-35 FPM
Usually requires more CFM, thereby raising cost up front and more fuel ongoing
Requires a full overhead plenum, thereby raising cost and requiring
additional headroom
Requires an in-ground trench or raised platform
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Semi-Downdraft
(Rear Exhaust Plenum)
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Semi-Downdraft
(Corner Plenums with
Outside Bridge Chamber)
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Semi-DownDraft (Corner Plenums w/Inside Bridge Chamber):
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Semi-DownDraft (Corner Plenums w/Individual Exhaust Stacks):
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Semi-DownDraft (sometimes called modified cross-flow):
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Often a good alternative to Downdraft “eight on a scale of one to ten”
Good airflow over the product- much better than pressurized crossflow
Provides good contact ratio of heated air to product during cure cycles
Economical to purchase and operate in comparison with Downdraft
Does not require concrete trench or raised platform
Airflow design is 100 FPM in direction of airflow (width x height x 100).
This is NFPA and OSHA requirement
Can have slight “dead zones” below supply plenum in very tall booths
Can tend toward “stratification” of heated air in cure cycles in long
and/or tall booths
Settling overspray on the product can be a problem that painters need
to learn to overcome, especially in long booths.
Overspray “fallout” will become evident in long booths. This may
require more maintenance.
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Side-Downdraft
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Side DownDraft Airflow:
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This type is widely pushed by competitors as a “pit-less downdraft”
A fairly good alternative to downdraft “seven on a scale of one to ten”
Some applications cannot or will not cut the floor for a trench
Provides a relatively short path for overspray to exit
Eliminates dry overspray on product
Easily lends itself to “drive-through” applications, due to the plenums
being out of the product path
Overspray is pulled directly toward the painter (“ankle painter”)
Requires as much airflow as downdraft, without the same benefits
Does not provide a “wrap” of airflow around the product
Requires the same headroom as downdraft
Requires additional width (3’-7’additional)
Often requires additional exhaust stacks
Less flexibility for personnel doors, due to side plenums
More costly than a Semi- downdraft due to construction and airflow
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Cross-Flow (Positive Pressure – Side Plenums):
Cross-Flow:
 The least expensive alternative “three or four on a scale of one to ten”
 Negative pressure versions are quite popular due to cost savings
 Positive pressure; corner plenum versions, especially drive through,
are quite in-effective due to the air simply flowing down the sidewalls
and missing the product (semi-downdraft is a much better alternativethe air is moving over the product).
 Negative pressure; These are generally not a good choice when the
prospect is looking for a quality finish- air drawn through the filter
doors is seldom as clean as a positive pressure overhead plenum.
When door are opened, dirty air is drawn in.
 Settling overspray on the product can be a problem that painters need
to learn to overcome.
 Overspray “fallout” will become evident in long booth. This may
require more maintenance.
 Positive pressure versions can cost as much or more than a semidowndraft.
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