I'm working on buying a dust collector for my shop. I have an overhead air filter, and a shop vac, but these have been woefully insufficient to really take care of the dust. My shop has been accumulating an amount of settled dust for a couple of years or so now, and that layer seems to be persistent. I vacuum up dust on the floor, but there is just dust on EVERYTHING, and cleaning all of that up has been really hard. I blow it off, and the overhead filter sucks up some of it, but most re-settles. I have a notable allergy to wood dust, so taking care of this has become top priority for this year as I get back into woodturning.
Most of my shop is Jet/Powermatic now, and Jet has a sale. I've been looking at this 2HP dust collector. From my research, for my shop size and my plans for a primarily 6" ducting, I'm calculating that I need about 4500fpm airflow. The CFM required to sustain that depends on the inlet size, and for 4" inlets I think I'll be fine, however I am not as sure for 6". However, I'm rather confused about all the reported specs for this particular model, as I've seen the CFM listed at around 930, 1200, and over 1500 CFM. Its the exact same model, so it is strange that its CFM is reported so many different ways. I can't quite figure out what inlet size these values are reported for, whether they are the "US" method or the "EU" method. I found this blurb in the documentation PDF for this particular collector as well, which reports both US and EU methods, but it doesn't really explain what those are, or why the results are different:
The 930 CFM is the main number I'm wondering about. A 4700+ FPM rating would be satisfactory, as I'd need 4500 for 6" ducting (will be starting with some flexible ducting, but longer term the intention is to add 6" metal ducting to the areas that need dust collection, then use the flexible ducting to actually connect each machine to that ducting.) I've worked out most of the connectors and splitters, will generally be using 45 degree splitters in most cases, except for a couple cases where, one way or another, 90 degrees is going to be required (and as I understand it, two 45s is the same as one 90 as far as how it impacts airflow).
My shop is narrow, but long, and I've only got one spot at one end where I could fit a DC. So, I'm going to have 6" ducting overhead down basically the middle of the shop, with splits off where I need to connect to each machine (and I've got 6 total right now, with a 7 that should be added later in the year). So...I need to make sure that I can maintain the necessary airflow to avoid chips and dust filling up my ducting over the entire length, and 4500 FPM seems to be the lower limit for my needs. But, I am honestly not sure if the above listed FPM is for...a 6" inlet, or 4" inlet? I am not sure what the US vs. EU method means, or which one may apply when? Is the 4763FPM listed here, actually what I'd be getting once I've installed the system and put in all the necessary ducting?
Most of my shop is Jet/Powermatic now, and Jet has a sale. I've been looking at this 2HP dust collector. From my research, for my shop size and my plans for a primarily 6" ducting, I'm calculating that I need about 4500fpm airflow. The CFM required to sustain that depends on the inlet size, and for 4" inlets I think I'll be fine, however I am not as sure for 6". However, I'm rather confused about all the reported specs for this particular model, as I've seen the CFM listed at around 930, 1200, and over 1500 CFM. Its the exact same model, so it is strange that its CFM is reported so many different ways. I can't quite figure out what inlet size these values are reported for, whether they are the "US" method or the "EU" method. I found this blurb in the documentation PDF for this particular collector as well, which reports both US and EU methods, but it doesn't really explain what those are, or why the results are different:
The 930 CFM is the main number I'm wondering about. A 4700+ FPM rating would be satisfactory, as I'd need 4500 for 6" ducting (will be starting with some flexible ducting, but longer term the intention is to add 6" metal ducting to the areas that need dust collection, then use the flexible ducting to actually connect each machine to that ducting.) I've worked out most of the connectors and splitters, will generally be using 45 degree splitters in most cases, except for a couple cases where, one way or another, 90 degrees is going to be required (and as I understand it, two 45s is the same as one 90 as far as how it impacts airflow).
My shop is narrow, but long, and I've only got one spot at one end where I could fit a DC. So, I'm going to have 6" ducting overhead down basically the middle of the shop, with splits off where I need to connect to each machine (and I've got 6 total right now, with a 7 that should be added later in the year). So...I need to make sure that I can maintain the necessary airflow to avoid chips and dust filling up my ducting over the entire length, and 4500 FPM seems to be the lower limit for my needs. But, I am honestly not sure if the above listed FPM is for...a 6" inlet, or 4" inlet? I am not sure what the US vs. EU method means, or which one may apply when? Is the 4763FPM listed here, actually what I'd be getting once I've installed the system and put in all the necessary ducting?