Thread: Air cleaner and directed clean airstream blower

Originally Posted by mic-d

The capacity with just the dirty G4 prefilter in place was ~680cfm, with the F7 alone it was 487cfm and with both nested together it was 440cfm. For my workshop of 3700 cubic foot empty space this is a full exchange every 8.5 minutes. But this is to be run only after the room has had a good scrubbing with my dusty. I'll probably tick it over for a couple of hours after work.

That should be OK for cleaning up after the dusty and prepping the workshop for applying finishes etc. Ideally you want to capture escaping fine dust before it settles out because then just walking thru the workshop, moving stuff around or cleaning up just fluffs the settled dust up off surfaces.


My shed is slightly smaller than yours and my air filter is 800 CFM but I get very to close outside average dust concentrations anyway by just running the DC for a few minutes after the last major dust making activity.

Originally Posted by BobL

That should be OK for cleaning up after the dusty and prepping the workshop for applying finishes etc. Ideally you want to capture escaping fine dust before it settles out because then just walking thru the workshop, moving stuff around or cleaning up just fluffs the settled dust up off surfaces.


My shed is slightly smaller than yours and my air filter is 800 CFM but I get very to close outside average dust concentrations anyway by just running the DC for a few minutes after the last major dust making activity.

Thanks Bob. I usually have a couple of ducts fitted that blow down low and stir up the air but I don't know if that will be effective with the new filter arrangement since the flow isn't as strong.

One of my reasons for wanting to improve the scrubbing efficiency of the cleaner is that I had to recirculate DE air this summer (although I have very good and large pleated filters and plastic bags). The heat and humidity was just so oppressive this year. If it was better climatic conditions I would probably install the blower in a window. Question about that, would it be more efficient to blow out workshop air or blow in outside air? If this humidity visits again next summer it might be time for another aircon, though I don’t know how they cope with the volume of ambient dust.

Originally Posted by mic-d

One of my reasons for wanting to improve the scrubbing efficiency of the cleaner is that I had to recirculate DE air this summer (although I have very good and large pleated filters and plastic bags). The heat and humidity was just so oppressive this year. If it was better climatic conditions I would probably install the blower in a window. Question about that, would it be more efficient to blow out workshop air or blow in outside air? If this humidity visits again next summer it might be time for another aircon, though I don’t know how they cope with the volume of ambient dust.

It's usually better to suck dusty air out than blow outside air in.
BUT
If there's only one air inlet to the shed eg a door, and the inside shed air is not stirred up this can create a reduced dust tunnel between the air inlet and the outlet while the rest of shed remains dusty.
Multiple air inlets can help mitigate this.

Something like pedestal fan can help stir inside shed air and help keep fine dust suspended so that it can be extracted rather than settling.