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Best filter media for shaker baghouse12/15
I have been monitoring air quality in the shop over winter (because the shop doors are closed) and think that I should be able to improve on the Beane filter tubes that I have now. I have not been able to find and efficiency charts for the various weights of shaker felts. I'm waiting for American Fabric Filter to get back to me, but thought I would see if anyone here might know of a resource to help make an informed decision.
I know that there are other considerations besides filter material, but i have calculated the air flow across the filters to be very low compared to typical, because I originally bought an oversized baghouse as a cyclone afterfilter. CFM / SQFT is less than 10 at the absolute max that the blower could theoretically pull through the cyclone.
I can't address the filter fabrics, but there are two types of filter "socks", depending upon your system.
One is designed to use "filter cake" as part of the filtering media. That is, they are more efficient when there is a layer of fine dust on them. I shake mine off about once a month or two. An access door provides a clean out and inspection.
The other is designed to be used with a shaker grate. The grate at the upper end of the bags, shakes them for about 30 seconds when the system is shut down. The fines drop into the bin with the rest of the shavings. This is usually for larger systems, the filter cake socks for smaller systems.
When you say "best" what does that mean?
I suspect you mean cleans the air the best but the other things come into play. AFF will be able to guide you.
^^^ Cleans the air the best.
So far it sounds like PTFE coated felt is best for that.
Would the PTFE bags be good enough that the return air could go into a spray booth?
JR, how are you monitoring the air quality?
Joe - I bought a Dylos air quality monitor / particle counter that I heard about in an old thread on here somewhere. It is a DC1100. They have a model calibrated for 0.5 micron and 2.5 micron that is recommended for wood shops.
Interestingly, after I started the quest for better bags based on the high readings that I was seeing, the commercial kitchen in the nextdoor unit finally installed a real hood system. The fine particle cound dropped by a factor of 10 after it fired up over this past weekend. The air quality with both my dedicated sander collector and the main shop collector running improved drastically as a result, and I may not need to improve on the Beane fabric.
According the the air quality chart in the manual, the shop air went from "Very Poor" to "Good." Smoke and airborne grease, etc. was the culprit...