I have a Donaldson Torit dft 2-4 10hp dust collector that I'm refurbishing for my plasma table. I need to replace the cartridges. I will need 8 of them, I can get after market filters in either MERV 11 or MERV 15. The MERV 15's are $40 more (each) than the 11's, I know that they filter "better" but I also know that they flow less air, is the cleaner out put worth the loss of CFM? I'm going to opt for the fire resistant version in case a spark makes it to the filters.
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