I just built a plenum using the studs of my workshop as the sides and on the
outside of the shop, I have mounted a large squirrel-cage blower. I will
put a thin plywood cover over the studs thereby forming a suction box and I
can plug in the hose for various tools such as radial-are saw and planer.
The hose runs will be about ten feet at the longest. What cheap
size/type/source hose would be best for this vacuum system? I searched
google but had too many hits to make a selection so I thought I would ask
those who have done this.
Most cheap hoses serious amount of pressure losses and even at 10 feet, it
can compromise a borderline system. Spring for hose made for dust collector
use, such as-
(Amazon.com product link shortened)63249907/sr=-2/ref=sr__2_etk-garden/002-5105340-0912061?v=glance&s=hi&n(6168
I'm concerned about how effective this system will be. If I understand
what you've built you have the stud bays which measure 3.5" x 14.5"
(2x4s on 16 in centers) forming the duct. This yields a cross section
of 0.35 sq ft, about equivalent to an 8" dia round duct, except that you
have rougher surfaces and square corners so your drag will be greater
than a smooth round duct.
To effectively move saw dust a minimum velocity in the duct should be at
least 3,500 ft/min. For your stud bay this will require over 1,200 cu
ft/min of air, more than most home dust collectors can achieve.
If I misunderstood and you have enclosed the bays in the ceiling which
may be 2x10s on 16 in centers your blower needs to move well over 3,200
Am I missing something here?
I don't know if you are missing anything. The plenum is 16x16x3.5". There
is so much suction that I don't need to screw or nail the plenum cover on as
it sucks it up tightly to the 2x4s and I mean tightly. This is no slouch of
Naturally, I will secure the cover and seal any leaks with a gasket.
Thanks to Preston for the input about the hose.
No I didn't,other than a guess.
The post was about using a squirrel cage blower and wall cavity for dust
If I interpret the guess right, it is a blower from a furnace. It will not
work because it does not create enough suction, and will get clogged from
wood chips. A DC will have at least 2 HP and a non clog impeller.
Jim in NC
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