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Downdraft Spraybooth

Downdraft Spraybooth

The Downdraft Spraybooth has two major functions: provide a clean working environment for paint refinishing, and efficiently remove paint overspray from the booth.



The downdraft spraybooth draws air through the air replacement unit(1) where air is pre-filtered(2) and preheated to the desired temperature before it enters the spraybooth plenum chamber. The air-replacement unit can be found on the roof of the shop, on top of the spraybooth, mounted through the wall, or as this illustration shows, located on the side of the spraybooth.

As air enters the spraybooth plenum chamber, it is directed down vertically through the diffusion filters(3) located in the ceiling of the spraybooth. As air is drawn through the diffusion filters it passes around the vehicle and is drawn through the exhaust filters(4) located in the floor or the pit of the spraybooth. After the paint overspray passes through the exhaust filters located in the pit, the air is drawn out by the exhaust fan and up through the exhaust stack(5).

Both foreign and domestic downdraft spraybooths basically use a three stage filter system to filter incoming and outgoing air used by the spraybooth. These filters are the pre-filters(2), diffusion filters(3) and exhaust filters(4).

The major purpose of the pre-filters is to filter out coarse dust and keep it from entering the spraybooth plenum chamber where the diffusion filters are located. The pre-filters prevent the diffusion filters from prematurely face loading or blinding with contaminants which will shorten the life of the diffusion filters. Spraybooth manufacturers, both foreign and domestic, have varied in their approach with pre-filter applications. The pre-filters, which are located in the air replacement unit could be metal washables, polyester pads, fiberglass pads, panel filters, or bag type filters. These filters are supplied by Viskon-Aire; however, please consult us for the best application for your particular spraybooth.

The diffusion filters(3) are located in the ceiling of the spraybooth and have two major functions: keep damaging particles from entering the spraybooth, and to provide a uniform distribution of air flow around the object to be painted. Viskon-Aire diffusion filters have been engineered to filter out 100% of all particles that can cause paint defects and to provide the air flow resistance needed to ensure even air flow in the booth. Depending on the booth design, these would be Viskon-Aire's T-700/G™ or VR-1 filters.

The exhaust filters can be found in the floor of the booth, generally under the grating. These filters must be properly designed to efficiently collect paint overspray yet not restrict air flow. Improperly designed exhaust filters can cause paint buildup in the exhaust system, clogging fans, ducts and creating a fire hazard. Viskon-Aire paint arrestors have been designed to give the booth operator the proper balance between efficiency and life, ensuring proper booth operation.

Proper maintenance of all filter stages in downdraft booths is necessary to ensure proper booth operation and high quality paint finishes. Be sure to follow the booth manufacturers’ recommendations to use only high quality Viskon-Aire filter replacements.

The downdraft spraybooth has two major functions: provide a clean working environment for paint refinishing, and efficiently remove paint overspray from the booth.

The downdraft spraybooth draws air through the air replacement unit(1) where air is pre-filtered(2) and preheated to the desired temperature before it enters the spraybooth plenum chamber. The air-replacement unit can be found on the roof of the shop, on top of the spraybooth, mounted through the wall, or as this illustration shows, located on the side of the spraybooth.

As air enters the spraybooth plenum chamber, it is directed down vertically through the diffusion filters(3) located in the ceiling of the spraybooth. As air is drawn through the diffusion filters it passes around the vehicle and is drawn through the exhaust filters(4) located in the floor or the pit of the spraybooth. After the paint overspray passes through the exhaust filters located in the pit, the air is drawn out by the exhaust fan and up through the exhaust stack(5).

Both foreign and domestic downdraft spraybooths basically use a three stage filter system to filter incoming and outgoing air used by the spraybooth. These filters are the pre-filters(2), diffusion filters(3) and exhaust filters(4).

The major purpose of the pre-filters is to filter out coarse dust and keep it from entering the spraybooth plenum chamber where the diffusion filters are located. The pre-filters prevent the diffusion filters from prematurely face loading or blinding with contaminants which will shorten the life of the diffusion filters. Spraybooth manufacturers, both foreign and domestic, have varied in their approach with pre-filter applications. The pre-filters, which are located in the air replacement unit could be metal washables, polyester pads, fiberglass pads, panel filters, or bag type filters. These filters are supplied by Viskon-Aire; however, please consult us for the best application for your particular spraybooth.

The diffusion filters(3) are located in the ceiling of the spraybooth and have two major functions: keep damaging particles from entering the spraybooth, and to provide a uniform distribution of air flow around the object to be painted. Viskon-Aire diffusion filters have been engineered to filter out 100% of all particles that can cause paint defects and to provide the air flow resistance needed to ensure even air flow in the booth. Depending on the booth design, these filters would be the T-700/G™ or VR-1 filters.

The exhaust filters can be found in the floor of the booth, generally under the grating. These filters must be properly designed to efficiently collect paint overspray yet not restrict air flow. Improperly designed exhaust filters can cause paint buildup in the exhaust system, clogging fans, ducts and creating a fire hazard. Viskon-Aire paint arrestors have been designed to give the booth operator the proper balance between efficiency and life, ensuring proper booth operation.

Proper maintenance of all filter stages in downdraft booths is necessary to ensure proper booth operation and high quality paint finishes. Be sure to follow the booth manufacturers’ recommendations to use only high quality Viskon-Aire filter replacements.

Downdraft
Downdraft Pre-filters
Exhaust Filters
Diffusion/Ceiling filters
 
 


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