I just got Jet’s 2HP cyclone dust collector as an upgrade from Grizzly’s 2HP canister unit. My main driver was to get a more quiet dust machine with a side benefit of it being easier to empty. So while I had both machines on hand I measured their sound levels and air volume throughput.
The purpose of this post is not only to compare the two machines but also to give a little more real world data on the sound levels produced by dust collectors as opposed to what the manufacturers publish.
My testing instruments were:
The ambient noise levels in my shop measured @ 43 dBA.
My first test put the machines out in the open with a short length of 4″ hose to constrict flow a bit. I stood with the sound meter from where the photo was taken, about 10 feet away.
Grizzly: 86 dBA, 1065 CFM
Jet: 82 dBA, 1070 CFM
The air volume numbers were essentially the same, showing that the 4″ hose restricted them to the same volume.
Next I tested the dust collectors where they actually live, in this weird little room my basement has. It’s about 8′ x 8′ and is where the water main comes through the floor. As a woodworker it serves me pretty well by giving me a plash to stash a noisy machine.
On this test I measured the sound levels from about 15′ away next to my lathe. This is where I will spend a lot of time with the collector running while sanding or turning dry wood so I was interested to see what my ears would be subjected to.
As for airflow I measured the flow at my lathe’s dust hose and my jointer’s dust hose. Each of these machines are at the end of the two branches of my dust system.
Grizzly: 76 dBA, Lathe = 550 CFM, Jointer = 500 CFM
Jet: 70 dBA, Lathe = 550 CFM, Jointer = 532 CFM
The two jointer numbers are not the same because the dust collectors have different inlet locations and therefore force a different shape in the hose hooked up to them. The Jet’s inlet is higher up so I was able to reduce the severity of the bends which netted me 30 more CFM. The lathe piping run was able to keep approximately the same shape. In the photo to the left, the PVC elbow is for the lathe while the flexible run is for the jointer.
I was happy to note that the Jet’s lower noise level is very noticeable from my lathe area. In fact the whooshing noise from the dust hood is pretty much louder than the actual dust collector.