Reply by Mike_D_S

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Posted on Shop Fox 1.5 HP (W1685) options for garage workshop

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595 posts in 2663 days

#1 posted 12-13-2017 03:43 PM

As noted by rwe2156, 20 ft of 4” flex hose produces approx. 4 inches of static pressure loss, where 20 ft of 4” hard pipe is about 1.25 inches loss for a straight run. Adding bends, etc will increase both about the same. So you could easily find the 20 ft of 4” flex to be unacceptable while the 20 ft of hard pipe might be fine.

I’m not a DC purist by any means, so I’m not going to tell you that unless you put in a 5HP cyclone you’re wasting your time. But at the same time, I will tell you the 1.5HP Shop Fox is a lower power DC and therefore the difference between a happy DC user and an unhappy user will come down to the ductwork.

The W1685 is spec’ed at 1280 CFM at 0” static pressure loss and 10.1 inches max static pressure at 0 CFM. So assuming a sort of normal curve shape for a bag collector and with the fairly sure knowledge that the rated 1280 CFM is probably just for the blower, you might be looking at minimum acceptable performance (400 CFM) around 5 or 6 inches of static pressure.

So starting from max at 10.1, take off 1” for a seasoned bag, and then subtract 6” for your operating pressure target and that means your working pressure loss for your duct system is 3” static loss max.

If you are going to go through the effort to buy and install the ducting, you owe it to yourself to do the math on the longest run to make sure you are not wasting time and effort only to arrive at a setup that is not going to meet your desires.


-- No honey, that's not new, I've had that forever......

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