CFM Rating

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Forum topic by Drew - Rock-n H Woodshop posted 12-02-2011 12:13 AM 925 views 0 times favorited 3 replies Add to Favorites Watch
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Drew - Rock-n H Woodshop

644 posts in 2657 days

12-02-2011 12:13 AM

What rating is enough for a stationary DC system with runs of pipe to each tool. Mine isn’t high enough, at 650, but I have found DC’s from Harbor Freight that rate at 1375 and 2750. Will either of these work for a 2 car garage shop? Will the 1375 be a better choice than an overkill 2750?
Thanks for the input in advance…...Drew

-- Drew -- "I cut it twice and it's still too short!"- Rock-n H Woodshop - Moore, OK

3 replies so far

View Sawkerf's profile


1730 posts in 3034 days

#1 posted 12-02-2011 01:24 AM

The 1375 should be good – if you do a good job on your ductwork. The big flow killers are flex hose, changes in flow direction, flow reducers, and leaks.

I’m running a Jet 1150 cfm with 6” HVAC duct and fittings. I have 6” at the table saw and SCMS. I reduce to 4” everywhere else, and all fitting joints and seams are taped with aluminum duct tape. The 6” duct runs ~10’ and the 4” runs ~12’.

-- Adversity doesn't build reveals it.

View Elizabeth's profile


817 posts in 3109 days

#2 posted 12-02-2011 01:30 AM

I’ve got a Laguna 2hp Cyclone with 1600 cfm. I work in a 500 square foot shop (about 2 car garage size) with about 55 feet of ducting, half of that at 6”. I’m still in the final stages of installing it and one of the 4” runs is currently wide open, but even so (and despite a couple of upside down and therefore not fully sealed blast gates – oops) it is strong enough to pull sawdust via the floor sweep, up eight feet vertically and then across another ten or so to the unit (passing by the uncapped run in the process).

View Rick  Dennington's profile

Rick Dennington

5807 posts in 3160 days

#3 posted 12-02-2011 02:00 AM


You are surely lacking in the cfm department….:) A planer or jointer will eat pretty much of that up, and give you very little left over…..I’d say go for the biggest you can get….1375 is good, but 2750 is ssooo much better…...:)) Who knows…you may move into a bigger shop some day, and need all the cfms you can get….i did, and when I did, I upgraded to more cfms….

-- " At my age, happy hour is a crap and a nap".....

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