Modified Downdraft Airflow Design

Modified Downdraft Airflow Design


Modified Downdraft Spray Booth is also used for high quality finishes. They are many times used in large equipment applications where there are multiple spraying operations. Just like the downdraft booth design, the term “modified downdraft” also refers to the direction of air travel in the booth, in this case, in a downward movement from the ceiling down towards the floor of the booth. It can be defined as a booth where supply air enters the top supply plenum where supply filters are located in the ceiling, and then passes over the part as it moves towards the floor of booth. The airflow is “modified” as the exhaust filters and plenums are located along the length of the booth near the floor which are called side plenums. This type of booth is sometimes referred to as a “Side Downdraft” style, which, unlike a Downdraft booth that requires a pit in the floor with grading, this modified airflow still allows the air to travel from the ceiling of the booth over the part and then towards the floor, but is diverted to these side exhaust plenums. This airflow design causes the air to move towards the bottom sides of the booth as it is directed to the exhaust filters. As the overspray is directed to these side plenums, the overspray passes through the filters and is removed from the air stream as it is drawn by the exhaust fan and ductwork system to discharge cleanly into the atmosphere.

Stage 1

Air is drawn in through the top of the booth. R-1 panels are designed by Viledon for air make-up of paint spray booths. The multiple synthetic layers combine a pre-filter consisting of a high performance cover mat with a final filter of progressively structured media, thermally bonded and treated with a special adhesive tackifier.

Stage 2

After passing through the filters, the air is particle, and dust free. This creates a virtually clean environment. This clean air passes through the booth resulting in controlled and even airflow.

Stage 3

The air continues down and around the product collecting overspray, moving it away from the product being sprayed down towards the exhaust filters. After reaching the exhaust filters, the airflow has successfully suspended overspray keeping the spray painting environment at optimal performance.

Stage 4

The air continues into the exhaust filters which are designed to hold more paint. They are made from a continuous filament glass fiber with an open weave pattern. This design prevents face-loading as they become saturated. This design forces paint-laden air to change direction many times as it passes through the filter preventing fogging.

Stage 5

To have the best possible airflow, Spray Systems precisely matches the size of the motor and fan assembly, to each booth. These assemblies operate at noise levels at or below OSHA limits.

See it in action

This all comes together in complete harmony of clean, smooth air flowing over your product for the best possible environment that enables you to give your customers, the best product you can. At the same time knowing you are doing your part in keeping our environment clean and safe.