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Automotive Paint Booth Series

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):

• One-Stop Source in the Industry.

• We Custom Design to Maximize Quality Finishes’.

• Give Vista Your Toughest Conditions.

• Performance Guarantee.

• Solutions for every budget!

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•Automotive

•Woodworking

•Industrial

•Downdraft

•Semi-Downdraft

•Cross-Flow

•Custom Design

Airflow Configurations Style/Applications

Equipment Types:

DownDraft Paint Booths:

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Downdraft (Dual Trench)

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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 on-

going● Requires a full overhead plenum, thereby raising cost and requiring

additional headroom● Requires an in-ground trench or raised platform

DownDraft Airflow:

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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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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.

Semi-DownDraft (sometimes called modified cross-flow):

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Side-Downdraft

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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

Side DownDraft Airflow:

Cross-Flow (Positive Pressure – Side Plenums):

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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 alternative- the 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 semi-downdraft.