Originally Posted by
Alan Lightstone
Well, sorry it took so long. Life got in the way.
Today I ran the belt sander with only the Jet 2000 running. Two tests. One with the original filters on the Jet 2000, running at high speed. The other with the original filters with the addition of a 3M Filtrete MERV 14 / MPR 2800 filter taped to the intake grill.
The measurements were done with my Dylos DC1100 meter, which, I believe measures 0.5 micron particles for its small particle setting per 0.1 cu ft of air (I could be wrong on the particle size. I'm going from memory here, but its the one set up for woodworkers to measure the smaller particles). My shop has a volume of roughly 18600 cu ft (very tall ceilings).
Baseline particle count in workshop: 329 small particles (was a good day here. It usually is about 500.)
Original Setup: Starting small particle count - 2121. Ending small particle count - 323. Time - 18 minutes.
Additional MERV 14 filter added: Starting small particle count - 2131. Ending small particle count - 318. Time - 17 minutes.
Sorry I couldn't get this into a table format. But the bottom line seems to be that the addition of the extra MERV 14 filter only decreased the time to get to baseline particle count by 1 minute, or a little over 5% reduction. Essentially no difference.
Now, I haven't been able to locate a MERV 14 filter that I could use to replace the original filter. That might have a more dramatic effect. But, basically, I'm not impressed that this helps.
Any other thoughts? Am I missing something, David?