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Forum topic by TheGermanJoiner posted 12-04-2013 12:28 AM 721 views 0 times favorited 3 replies Add to Favorites Watch
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TheGermanJoiner

847 posts in 1102 days


12-04-2013 12:28 AM

Topic tags/keywords: dust collector ductwork

Just bought a used powermatic 3hp dust collector. The machine will accept an 8” main line does anyone know if it is advantageous at all to run that or just run a 6”. My thought is every collection system I see in small shops is 6” reduced to 4” at the machines. If an 8” line is going to make that much of a difference I will run it, but I wanted to see if anyone has any input. Thank you to all for your wonderful advice

-- Greg - Ferdinand and Son Construction: Do it right the first time. Like us on Facebook


3 replies so far

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Paul Stoops

339 posts in 2026 days


#1 posted 12-04-2013 01:43 AM

I wonder if a 3HP dust collector would handle 8” ducting without overloading the motor. I just noticed your previous post that it has a 17” impeller! What is the current rating of the motor? Be sure you have wiring large enough to handle the load. I suspect you will need a 30A, 240VAC circuit wired with #10 wire. I would contact Powermatic and ask them the question.

-- Paul, Auburn, WA

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TheGermanJoiner

847 posts in 1102 days


#2 posted 12-04-2013 01:51 AM

That’s what I was wondering too Paul. It’s a 14” impeller and claims 1900 cfm in a 4” duct. I think you’re right maybe I’ll contact powermatic

-- Greg - Ferdinand and Son Construction: Do it right the first time. Like us on Facebook

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Paul Stoops

339 posts in 2026 days


#3 posted 12-04-2013 02:08 AM

I don’t think you can get that much airflow in a 4” duct—more like 400 – 500 CFM. Unfortunately, many of the advertised airflow numbers are not even close to reality. I would run 6” duct with a fan that size. I have a 3HP unit plumbed with 6” PVC and it performs very well. But I would definitely get a clamp on ammeter if you don’t have one (the HF units work fine) to check the motor current with whatever duct size you choose. When I ran the fan curve on my 3HP unit, with only the test duct attached and no outlet restrictions (filters, etc.) the current exceeded the motor rating on the high end. Don’t run the fan with nothing attached to the inlet for more than a very short time or you will burn out the motor!

-- Paul, Auburn, WA

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