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Venting DC outside, how far from wall penetration?

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Forum topic by Rob_s posted 01-05-2017 09:59 PM 1477 views 0 times favorited 19 replies Add to Favorites Watch
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Rob_s

145 posts in 258 days


01-05-2017 09:59 PM

I’m thinking of venting a DC outside through a window. The issue is that the DC can’t sit directly in front of the window in question and might need to be a couple of feet away. Would this be an issue? Flex hose vs. hard pipe make a difference?

-- www.facebook.com/therealbnrlabs


19 replies so far

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papadan

2543 posts in 3005 days


#1 posted 01-05-2017 10:08 PM

I had a 2 hp Grizzly for years. It sat under a shed roof beside my garage. I had one window pane broken so I replaced it with a piece of plywood and ran the 4” flex through the ply. My garage was plumbed with 4” flex to all major machines and the bench. Never had any problems with the setup or dust in the shop. I also had it controlled by a Long Ranger remote.

-- Artificial intelligence is no match for natural stupidity!

View Gene Howe's profile

Gene Howe

8938 posts in 3065 days


#2 posted 01-05-2017 10:45 PM

I used a flex hose to a short length of vent pipe. About 4” inside the 6” thick wall and about 6” outside.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View sawdustdad's profile

sawdustdad

190 posts in 522 days


#3 posted 01-05-2017 11:06 PM

the larger the discharge line, the better. A 6 inch metal line would work well. A section of flex hose will isolate the penetration pipe from the machine, minimizing rattling at the window. Consider that you will lose any heat or A/C in the process, if that matters.

-- Murphy's Carpentry Corollary #3: Any board cut to length has a 50% probability of being too short.

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Rob_s

145 posts in 258 days


#4 posted 01-06-2017 11:44 AM

shop doesn’t have heat or AC so that’s a non-issue for me.

My primary concern was whether the blower would be pushing the dust out with enough force to get through a hose and a could of bends of metal ducting, but when I think about it any of the Harbor Freight style DCs have a she going from the blower to the bag assembly so I should be OK I’d think.

Still not sure if I’m going to just vent everything outside or do a separator first and then just exhaust the fine stuff. Obviously option A is the most appealing to me…

-- www.facebook.com/therealbnrlabs

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Gene Howe

8938 posts in 3065 days


#5 posted 01-06-2017 02:04 PM

You need the separator in line before the DC unit to protect the DC vanes from inadvertent chunks. I use a 35 gallon trash can with a purchased plastic “cyclone” lid. Very little dust actually goes though to the outside.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View Lazyman's profile

Lazyman

1148 posts in 1024 days


#6 posted 01-06-2017 02:29 PM

You are going to want a separator just to avoid having a big mess outside your window. The only thing you really want going outside is the finer dust that the separator cannot remove. While it is better for the impeller to have the separator before the DC there are some designs that send everything through impeller before the filter bag so on those designs you could theoretically have the separator sitting outside the window and the exhaust blowing from top of the separator.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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Rob_s

145 posts in 258 days


#7 posted 01-06-2017 06:10 PM

my assumption is that something like the HF DC is theoretically made to have the chips, chunks, and dust going through the impeller since there’s nowhere else for it to go.

I’m aware I’d be dumping everything outside, but my thought was to put an open-top can below the vent to at least catch the majority of it without having to worry if it maybe overflows a little. I’m on 1.25 acres and the back side of the shop is kind of a dead area anyway where I part my trailer, store pallets, etc.

-- www.facebook.com/therealbnrlabs

View Gene Howe's profile

Gene Howe

8938 posts in 3065 days


#8 posted 01-06-2017 07:16 PM

Once that first chunk hits your impeller, you might change your mind. DAMHIK.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

View William Shelley's profile

William Shelley

329 posts in 1106 days


#9 posted 01-06-2017 08:25 PM

I have the HF 2HP collector, I think I have had a couple chunks get sucked in from my table saw (cutting knotty pine, etc). It made a scary loud CLANG, but I heard no variation in the pitch/sound of the DC, so I think it’s probably fine. I would imagine if there was something wrong then I would be able to hear it. That being said, I would still prefer to have a cyclone or thein baffle to pre-filter.

What is the primary reason for venting outside? Is it to improve air quality in the shop? I’d be concerned about polluting my yard & garden with dust from cutting through glue or other non-wood materials.

-- Woodworking from an engineer's perspective

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Rob_s

145 posts in 258 days


#10 posted 01-06-2017 08:43 PM

Like I said, over an acre, no issue with “pollution”. Venting outside to save space in shop as well as save the hassle of the filter/bag. If I can literally vent directly outside with no separator, then it also means no bin to empty, or no bin to cry about if it gets over-filled.

-- www.facebook.com/therealbnrlabs

View Mark Shultz's profile

Mark Shultz

78 posts in 2027 days


#11 posted 01-06-2017 08:52 PM

i put my whole HF unit outside under cover and it has been fine. i do have a separator to avoid a huge mess outside (under my deck). it does still accumulate a mount of fine dust though over time.

View coxhaus's profile

coxhaus

42 posts in 531 days


#12 posted 01-06-2017 08:57 PM

I am putting my DC together to vent outside. I was going to use 6 inch light weight pvc pipe to a window where I replaced the pane with plywood. Sounds like I will need a small piece of flex hose to isolate the DC from the window. I will check for vibration. I am using a Cincinnati DC unit with a Baldor 2 HP motor and SDD.

View a1Jim's profile

a1Jim

115744 posts in 3214 days


#13 posted 01-06-2017 10:50 PM

My HF DC has the bag and hose outside that drops into a large trash can with a plywood top adapter on it outside, the fan is hanging on the wall inside with the hose through the wall no separator necessary no mess outside either. I did build a lean to shed to cover the bag outside. The bag acts like a filter like it should ,it has worked very well for close to ten years. If you can mount the fan along side the window and use a plywood filler to send your duct through you should be fine as long as you don’t get a bunch of 90 degree turns for the sawdust to get caught in.

-- http://artisticwoodstudio.com Custom furniture

View RogR's profile

RogR

100 posts in 502 days


#14 posted 01-06-2017 11:28 PM


shop doesn t have heat or AC so that s a non-issue for me.

- Rob_s

Point being, if you use the DC a lot you will be moving big (outside) air though your shop. As long as you like the temperature and humidity outside, and have enough surface area of openings for make-up air, you are good to go.

I thought about installing my 3HP outside (mostly for sonics) but ultimately decided it wasn’t worth the temp and humidity swings. Also, even though I’m on 2½ acres, the neighbors don’t need to know I’m working late. :-)

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a1Jim

115744 posts in 3214 days


#15 posted 01-07-2017 12:22 AM

Whenever venting outside is brought up people always talk about the air transfer from inside to out,my shop is heated and I’ve never realized any kind of big change in temperature change inside ,I think the only way it could be an issue is if you run your DC for a few hours at a time most of us don’t run our DC hours on for long periods of time even when you have lots of wood to plane it seldom takes an hour give or take when I plane several boards for a project.

-- http://artisticwoodstudio.com Custom furniture

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