Inspector":1a7amtuf said:
You want to move 1000 cubic feet per minute (cfm) of airflow to capture and remove fine dust
Bill Pentz recommends airflows of 1000CFM for "effective fine dust collection at our larger and dustier tools". To understand what this machinery may be, his site also contains a table with different CFM requirements for various tools. For saws with blades up to 16" diameter, this is between 790 and 988 CFM depending on the standard, which I guess is where the 1000 CFM figure is from. I think this is related to overcoming the dust particle velocity created by the tool, which presumably is related to the velocity which the teeth on the saw blade are moving.
This table doesn't seem to differentiate between table saws with dust collection built in both above and below the table, and mitre saws without.
My table saw blade is only 8.5" diameter. Does this mean the teeth are travelling at ~half the speed as a 16" diameter bladed machine? I haven't seen any figures for CFM requirements for smaller machines. I wonder how they vary. I have a 2HP extractor connected via a 100mm flexible hose, and my dust meter does not detect much increase in PM1.0, 2.5 or 10 levels when using it (that doesn't stop me wearing a powered respirator).
Sometimes, I get the impression Bill Pentz stacks lots of unfavourable variables together, ending up with a conservative (but therefore safe) conclusion. Does anyone have any views on this?
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