dust collector vent outside

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Forum topic by Tim_456 posted 04-13-2009 05:38 AM 4016 views 0 times favorited 7 replies Add to Favorites Watch
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170 posts in 3621 days

04-13-2009 05:38 AM

Hello all!

I’m looking to install a dust collector and I’m looking at a 1.5HP model (Steel City or Delta) with a cyclone trash can separator. I see some models with a pleated filter on top, other’s with a bag. Anyway, I’ll have the external cyclone and the one inside the DC so most of the wood should either be in the external can or the lower bag if I understand the way it will work. If that is the case, has anyone tried venting the remaining output outside the house/workshop/garage? If there’s little to no dust left, can it be safely vented outside?

Any thoughts on the pros or cons of this and if anyones done this?


7 replies so far

View Karson's profile


35125 posts in 4426 days

#1 posted 04-13-2009 05:45 AM

The only problem that I can see with outside venting is the amount of heat or air conditioning that you are dumping outside. A 1000 CFM will empty a shop in a short time.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware soon moving to Virginia †

View fredf's profile


495 posts in 3735 days

#2 posted 04-13-2009 06:02 AM

as Karson says, and if you have a oil or gas heater in the shop or even a wood or coal stove you could be sucking co into the shop . . .

-- Fred, Springfield, Ma

View TopamaxSurvivor's profile


18288 posts in 3701 days

#3 posted 04-13-2009 06:07 AM

Depends on what is in the immediate area. Wood dust is explosive. As we used to say in the fire department, “If it grows, it blows.”

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View MyOldGarage's profile


93 posts in 3453 days

#4 posted 04-13-2009 11:36 PM

I’m using my Grizzly 1 1/2 HP and put a pleated filter on it . . . empties right back into the garage . . . er . . workshop. It’s finally getting warm enough to work outside, so I cut my cheap Chinese plywood (GRRR!) outside to avoid whatever toxins they glued (sloppily) into it. :D

-- Bradley Miller, Blue Springs, MO -

View Cory's profile


760 posts in 3445 days

#5 posted 04-14-2009 03:41 AM

Dont’ forget about make-up air, too. If you’re dumping that much air outside you’ll create a negative pressure vacuum in your shop. You’ll pull the air from the house and whereever there are cracks/gaps into the garage… least that’s what I think I remember from a physics class in high school ;-)

-- The secret to getting ahead is getting started.

View John's profile


173 posts in 3819 days

#6 posted 04-14-2009 04:09 AM

I have a Grizzly 2hp bag dust collector and trash can separator lid. I wish I had saved my money and gone 6 inch ducting with a clearvue cylone. The trash can gets all the chips but the fine dust gets sprayed all over the shop. Do a little reading on this site before you buy.

You want to buy my Grizzly?

-- Brain the size of a planet and they have me parking cars.

View JimmyC's profile


106 posts in 3427 days

#7 posted 04-14-2009 06:46 AM

Good points and bad points.
- removes heat or a/c from shop
- can cause negative pressure, which wreaks havoc with an ignition flame from a heater, or H/W heater, or flue gas from said items ; also problems with wood stoves as far as exhaust fumes and bringing hot cinders into shop
- can cause noise outside of shop , which will be detrimental to keeping your neighbors happy
- NO bad dust to breathe in, any filter that returns in to your shop will release exremely small particles (worst kind for your health) back into your work area
- no back pressure on your DC sytem, allowing you to use a smaller DC and getting the same removal, also allpws your DC motor to run cooler and use less energy because there’s no strain on it

Realistically, most of us aren’t large professional shops running out DC system all day, it’s used intermittenly and our shops are not sealed op as tight as a gnats a$$, so the removing of heat or a/c and the chance of causing a major negative pressure is pretty slim. So it comes down to whether you have neighbors near your exhaust and whether you like them or not.

I’ve been running my dust outside without negative effects, so good luck in your endeavour.

-- -JimmyC...Clayton,NC- "Just smile and wave boys, smile and wave"

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