Downdraft Airflow Design
×

Downdraft Airflow Design

Introduction

Downdraft Spray Booth, which is a booth best for parts that require a high finish quality. These booths can also be designed to handle a wide variety of parts of all sizes. The term “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 top supply plenum where supply filters are located in the ceiling and then passes over the part as it moves towards floor of booth. Overspray is directed to the grating that is over a pit in the floor and then through exhaust filters, typically located right beneath the grating. 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

Downdraft Spray Booth, which is a booth best for parts that require a high finish quality. These booths can also be designed to handle a wide variety of parts of all sizes. The term “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 top supply plenum where supply filters are located in the ceiling and then passes over the part as it moves towards floor of booth. Overspray is directed to the grating that is over a pit in the floor and then through exhaust filters, typically located right beneath the grating. 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 2

Air is introduced into the booth’s air supply plenum and drawn through the supply filters located in the ceiling which act as a diffusion media. 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 3

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 4

The air continues down and around the product collecting overspray and gathers this overspray away from the product and down to the exhaust filters, which are located in the pit. This airflow design successfully manages the overspray while keeping the spray painting environment at optimal performance.


Stage 5

The exhaust filters add uniformity to the airflow as the fan draws air through the filters and into the exhaust pit. These filters are made from a continuous filament glass fiber with an open weave pattern. This design prevents face-loading as they become saturated with paint, and forces paint-laden air to change direction many times as it passes through the filter for max efficiency.


Stage 6

The Spray Systems exhaust fan is designed specifically to accommodate the static pressure of the filters and to have the best possible airflow. Spray Systems precisely matches the size of the motor and fan performance for each booth. These fans operate at dBa levels below OSHA limits.

See it in action

The down-draft booth design will meet safety and code requirements – NFPA-33 and IFC – to protect those that work in any industrial spray environment, while also protecting our atmosphere. Your booth will be designed to efficiently remove the overspray from the painting operation while maintaining uniform air flow throughout the work area.