Reply by nutsandbolts

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Posted on Harbor Freight 2 hp dust collector questions

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20 posts in 3122 days

#1 posted 03-06-2021 09:00 PM

Harbor Freight stock impeller is 10-inch diameter, and forward facing for the blades.
Rikon upgraded impeller is 12-inch diameter (fits inside the HF fan housing) and has rear facing blades.
The Rikon Impeller is an improvement. The Rikon impeller upgrade will draw more current, so the electrical circuit will need to be upgraded to a 20 amp breaker, and upgraded wiring to handle 20 amps of current.

Changing the impeller to the 12-inch Rikon impeller will increase static lift significantly (>30%). So, if you only run one woodworking machine at a time, you want more vacuum pressure (static lift). Who cares about vacuum pressure (static lift)? If you are trying to suck up chips and shavings (not dust), you need more vacuum pressure (static lift).

Bigger diameter piping (duct work) will increase airflow, cuz you are reducing the head loss. Just upsize your duct work diameter, so you can keep minimum airflow velocity, to keep dust airborne for the entire length of the piping.

So, two fans in parallel will boost your total airflow (more cfm). You can take advantage of the higher potential airflow, by going with large enough ductwork. Then, your next upgrade is to goto the 12-inch Rikon impellers, for both fans which are in parallel. The larger impeller, and switching to rear facing blades (Rikon) will boost vacuum pressure (static lift). Of course, upgrade to 20 amp circuits, a dedicated electrical circuit for EACH fan…so two separate 20 amp breakers, and upgraded electrical wiring for 20 amp circuits. No 90 degree fittings. Use wye fittings and use large radius sweep fittings. OR, only use 45 degree fittings, and in between 45 degree fittings use a stub of pipe at least 2 diameters long, between the 45 degree fittings…3 diameters long would be even better (short length of straight pipe)...cuz we want turbulent airflow to calm down, before encountering the next fitting.

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