Re: 2-bbl or 4bbl for 292?
Note, to directly compare the advertised cubic feet per minute (CFM) of your 2bbl to your 4bbl you have to multiply the 2bbl CFM by .707 given differences in how they arrive at the ratings (e.g., 2bbls are tested at 3 inches of vacuum and 4bbls are tested at 1.5 inches).
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