dust in painting booth

Where would the dust be coming from?

Do you have a fan in the booth?

If you have a fan in the booth that is sucking the air out, then where else can the air come in from.

Are you able to use filters that have one side tacky to catch the dust and hold it?

Do you have other work going on nearby that creates dust that can be picked up where ever the exhaust fans are creating a vacuum?

Are there gaps around any openings into the space like around doors? Maybe replacing weather stripping might help.

I think we need a better picture of the booth in question.

What are you painting? Do you hang the product on racks? What type of painting are you doing?

If you are hanging product on racks and are using spray paint, the over spray is loose and can break loose and fall on the parts when the racks are moved. This also applies if you are using electrostatic.

If there is air movement through the booth then you have potential for dust unless you can get a filter on every opening.

Is the material being moved somewhere to dry where it has access to the outside air?

I seem to recall reading that something like 86% of household dust was human epithelial cells. Those Tyvec suits work both ways, y'know

The solution I believe should be in 2 steps

First you should have positive pressure build up inside the chamber to avoid ingress of dirty air by continuously pumping filtered air. This is the most important step. This will avoid contamination from particles coming from outside. Of course you should have a gravity louvere which will exhaust air from the chamber.

It also will be a good idea to supplement above with a lower capacity exhaust fan taking away paint droplets from the immediate vicinity of the spray area.

You may also think about having seperate chambers for spraying and hanging the sprayed items for drying.

Please post in the forum action you take and effectiveness so that other members too would benefit