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post #1 of 23 (permalink) Old 02-25-2014, 01:55 AM Thread Starter
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Default dust collector exhaust

I have a 1 HP dust collector. It has a 4 inch inlet and a bag filter.

My plan is to exhaust the air outside. The dust collector currently has a 5 micron bag for dust collection. What are your suggestions for covering over this large opening and what would you use for the exhaust? My thoughts would be a piece of plywood secured to the opening and then running 1 or 2 of the 4 inch lines outside since I have extra 4 inch flexible lines. If the recommendation is two lines I would need to come out with a 6 inch wye reduced to 4 inch. Also, I plan on using a home made cyclone in front of the dust collector. Should the cyclone be placed near the dust collector or closer to the tool. My only tools are a 12 inch miter saw, 10 inch table saw and maybe a home made down draft table for a scroll saw.

I do not plan on using more than one tool at a time. I am mainly interested in keeping my lungs and garage clean.

Thank you in advance for any advice and suggestions you are willing to share.
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post #2 of 23 (permalink) Old 02-25-2014, 02:51 AM
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post #3 of 23 (permalink) Old 02-25-2014, 05:49 AM
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Jim, if using a cyclone in front of the DC, why do you want to exhaust outside?
  1. On my shop vac with a Dust Deputy, for example, there is NO noticeable dust that gets as far even as the vac, much less back into the air.
  2. The noise would still be inside
  3. If you get the outlet wrong you will effect the efficiency of the blower
  4. The make-up air back into the shop will be unheated or uncooled.

Just my thoughts.

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post #4 of 23 (permalink) Old 02-25-2014, 09:34 AM
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On my miter saw built into a work table along the wall with a drop to make the miter table even with work table also built a cover with 2 sides and the back wall helps contain the dust missed by dust collector pick hose hooked to back of miter saw.. As for table saw dust collection is harder due to no way to contain what is not sucked up by D/C. but not a real problem the down draft table should be fine.... My dust deputy is hooked right in front of a shop vac for most small tools and pinpoint dust control on the shop vac I HIGHLY suggest a Hepa filter to really clean the discharged air ....I would put the cyclone right ahead of the D/C this would help ....GoodLuck

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post #5 of 23 (permalink) Old 02-25-2014, 09:35 AM
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I just used a dryer exhaust vent hood. My dust collector is in a small garden type shed just outside of the shop to eliminate noise and is turned on and off with a remote type switch that I can carry in my pocket. Just have to open or close the appropriate blast gates for each tool as I only run one tool at a time also. I thought makeup air would be a problem so I installed two 4 inch inlet vents (vents on inside of shop with non louvered vent hoods on the outside) but the inside louvers hardly open when I have the dust collector on. Seems there is enough space around 16 ft garage door molding to let make up air in. Heating has not been a problem. You can get almost any size of exhaust vents.
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post #6 of 23 (permalink) Old 02-25-2014, 09:41 AM
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Not knowing how your particular DC is configured, my suggestions might be off a bit.
I removed both bags from the DC and mounted the impeller unit to a piece of plywood so that it would sit upright. Then cut a hole in the wall to accept a 4" piece of chimney flue. Connected the impeller exhaust port to the flue with a short piece of flexible hose.
The chip collector is just a 35 gal. trashcan with a plastic wanna be cyclone lid. It's placed close to the impeller so that the hoses to the machine(s) are all that has to be moved when switching from machine to machine.
My shop is heated and air conditioned. I've not noticed any difference in the temperature when using the DC. But, it only runs intermittently and probably no more than 2 hours a day.

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post #7 of 23 (permalink) Old 02-25-2014, 09:43 AM Thread Starter
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Jim, Thanks for the welcome. I do not have any pictures to load and if I did I don't have enough computer savvy to upload them.

Steve, I only do small projects inside the garage and not really much of a wood worker in terms of building intricate things such as furniture, etc. The reason for venting outside is that the dust collection bag is 5 micron and since I do not currently have a cyclone I get a lot of dust when I use the table saw or miter saw. I am not concerned about the heat loss and I do not have air conditioning (so no worry about cooling loss). Therefore, I figured if I vented to the outside I would not have to worry about dust even if some got past the soon to be built cyclone.
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post #8 of 23 (permalink) Old 02-25-2014, 09:59 AM
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Hi, Jim; welcome!
The perfect scenario would be for the DC to exhaust through a very large opening into a vacuum (no, not a vacuum cleaner; a real vacuum). The theoretical purpose being the difference in pressure between the inlet and the outlet. The less restriction on the outlet side, the more effective/efficient the impeller will be.
Whatever diameter the existing outlet collar on the machine is, that would be the optimal vent size. Anything less will begin restricting the air outflow...but without a bag, definitely more efficiently. It's going to be messy on the outside, however.
Why not just buy a new 1 micron bag(s)?
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post #9 of 23 (permalink) Old 02-25-2014, 11:02 AM
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Dan,
With my wannabe cyclone ahead of the impeller, I get zero to minuscule amounts of dust outside. Mine's a 2 hp unit. Don't know if that makes a difference, though. You are absolutely correct about the increased efficiency by venting outside, too.

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post #10 of 23 (permalink) Old 02-25-2014, 01:42 PM
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Hello Jim, really pleased to see you join the community, welcome to Router Forums!
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