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.
Thanks
Cass
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
cu ft/min.
Am I missing something here?
Phil
Cass wrote:
> 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.
>
> Thanks
>
> Cass
>
>
>
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-
http://www.amazon.com/exec/obidos/tg/detail/-/B00005A1IK/qid=1063249907/sr=-2/ref=sr__2_etk-garden/002-5105340-0912061?v=glance&s=hi&n=286168
Preston
"Cass" <[email protected]> wrote in message
news:[email protected]...
> 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.
>
> Thanks
>
> Cass
>
>
>
Phil,
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
a blower.
Naturally, I will secure the cover and seal any leaks with a gasket.
Thanks to Preston for the input about the hose.
Cass
"Phil" <[email protected]> wrote in message
news:[email protected]...
> 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
> cu ft/min.
>
> Am I missing something here?
>
> Phil
>
>
>
> Cass wrote:
> > 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.
> >
> > Thanks
> >
> > Cass
> >
> >
> >
>
correction: the box is ~ 14.5 x 14.5", as you said.
"Phil" <[email protected]> wrote in message
news:[email protected]...
> 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
> cu ft/min.
>
> Am I missing something here?
>
> Phil
>
>
>
> Cass wrote:
> > 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.
> >
> > Thanks
> >
> > Cass
> >
> >
> >
>
nope, nudder correction: it is 14.5 x 16 x 3.5"
"Phil" <[email protected]> wrote in message
news:[email protected]...
> 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
> cu ft/min.
>
> Am I missing something here?
>
> Phil
>
>
>
> Cass wrote:
> > 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.
> >
> > Thanks
> >
> > Cass
> >
> >
> >
>
I will look tomorrow.
In the meantime, I will guess that it is 1/3 h.p., 12" dia. and 12" thick
blower.
Cass
"Morgans" <[email protected]> wrote in message
news:[email protected]...
>
> "Cass" <[email protected]> wrote in message
> news:[email protected]...
> > Phil,
> >
> > 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
> > a blower.
> >
> > Naturally, I will secure the cover and seal any leaks with a gasket.
> >
> > Thanks to Preston for the input about the hose.
> >
> > Cass
>
> What is the HP of the motor, and the diameter and thickness of the blower?
> --
> Jim in NC
>
>
Jim,
Did you get my information that you had asked for?
Why were you asking?
Cass
"Morgans" <[email protected]> wrote in message
news:[email protected]...
>
> "Cass" <[email protected]> wrote in message
> news:[email protected]...
> > Phil,
> >
> > 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
> > a blower.
> >
> > Naturally, I will secure the cover and seal any leaks with a gasket.
> >
> > Thanks to Preston for the input about the hose.
> >
> > Cass
>
> What is the HP of the motor, and the diameter and thickness of the blower?
> --
> Jim in NC
>
>
Jim,
At what point do you think mine will stop working?
Cass
"Morgans" <[email protected]> wrote in message
news:[email protected]...
>
> "Cass" <[email protected]> wrote in message
> news:[email protected]...
> > Jim,
> >
> > Did you get my information that you had asked for?
> >
> > Why were you asking?
> >
> >
> > Cass
>
>
> No I didn't,other than a guess.
>
> The post was about using a squirrel cage blower and wall cavity for dust
> collection.
>
> 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
>
>
"Cass" <[email protected]> wrote in message
news:[email protected]...
> Phil,
>
> 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
> a blower.
>
> Naturally, I will secure the cover and seal any leaks with a gasket.
>
> Thanks to Preston for the input about the hose.
>
> Cass
What is the HP of the motor, and the diameter and thickness of the blower?
--
Jim in NC
"Cass" <[email protected]> wrote in message
news:[email protected]...
> Jim,
>
> Did you get my information that you had asked for?
>
> Why were you asking?
>
>
> Cass
No I didn't,other than a guess.
The post was about using a squirrel cage blower and wall cavity for dust
collection.
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
"Cass" <[email protected]> wrote in message
news:[email protected]...
> Jim,
>
> At what point do you think mine will stop working?
>
> Cass
Your what? Describe please.
--
Jim in NC