Reply by crank49

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Posted on Another Dumb DC Question

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4032 posts in 3451 days

#1 posted 10-18-2017 10:27 PM

Ok, you asked so here it is.
You state that you just vent outside, so I assume you are not using the filter bag at all.
You did not state what size ductwork you are using so I will conclude it is 4” since that is the most common.
If you were running 6” duct for this unit it would probably overload the motor from excess airflow without the filter bag in place. In theory you could run 5” duct for optimum performance. Or, a 4” and a 3” and combine them right at the cyclone/baffle inlet.
Cyclone and Thien baffles both create static loss on a dust collector. The more static pressure loss they create the better the efficiency of separating dust from air. The fan on the HF collector is rather small and does not have much capacity to waste, but without the filter bag there might be enough capacity to do what you are doing.
If you don’t have enough air flow with the trashcan lid you are going to have even less with a true cyclone. The more chips and dust you separate the less airflow you will have. That’s the. nature of the beast.

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