The coarser the better for paint booth filters. You want all air and dust to flow through easily without losing cfm and you just want to capture paint particles/overspray which a course filter works great for. The fine filters capture too much paint and get clogged quickly, dropping cfm and needing more frequent replacement
Thanks for your comment, though this sounds more like an EXHAUST filter issue rather than the intake filters (which don't typically have paint passing through). Unfortunately, by doing what you're saying and letting the fines through ultimately just loads the exhaust fans and ducting over time, making them inefficient, and depending on the coating or jurisdiction you can get fined for using a filter less than 98% efficient. The idea is to catch most of the paint and better filter construction CAN meet the load and efficiency demands. If your coating is dry and dusty when the paint hits the filters, then a finer front and heavier density poly back is typically used. If it is wet and sticky go with a courser front and less dense back poly for depth loading. The key is to get the proper filter to achieve 98%+ efficiency and best loading for longest life and way less exhaust-stack maintenance needs. Further, getting "high-cap" filters AND installing them properly can help to eliminate frequent changeouts. Further, making sure your spraying equipment is operating efficiently and not wasting paint prevents them from getting to the filters in the first place, of course. Let us know if we can help further!
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This guy knows his stuff, real helpful. Wow!
The coarser the better for paint booth filters. You want all air and dust to flow through easily without losing cfm and you just want to capture paint particles/overspray which a course filter works great for.
The fine filters capture too much paint and get clogged quickly, dropping cfm and needing more frequent replacement
Thanks for your comment, though this sounds more like an EXHAUST filter issue rather than the intake filters (which don't typically have paint passing through).
Unfortunately, by doing what you're saying and letting the fines through ultimately just loads the exhaust fans and ducting over time, making them inefficient, and depending on the coating or jurisdiction you can get fined for using a filter less than 98% efficient. The idea is to catch most of the paint and better filter construction CAN meet the load and efficiency demands. If your coating is dry and dusty when the paint hits the filters, then a finer front and heavier density poly back is typically used. If it is wet and sticky go with a courser front and less dense back poly for depth loading. The key is to get the proper filter to achieve 98%+ efficiency and best loading for longest life and way less exhaust-stack maintenance needs.
Further, getting "high-cap" filters AND installing them properly can help to eliminate frequent changeouts. Further, making sure your spraying equipment is operating efficiently and not wasting paint prevents them from getting to the filters in the first place, of course. Let us know if we can help further!
Just what I needed! Thanks for the info!