I'm setting up a lampworking shop & need to ventilate it. Some folks
are using 350cfm range hoods. The ventilator I like that is actually
built for lampwork is 650cfm.
My son is going to build the hood-- and I have a squirrel-cage fan
that I think will move a lot of air. Is there any way to
guesstimate if I'm going to be in the 6-800 cfm range?
The motor is 1/6 hp, 2 speed- 1175rpm. [at fast speed?]
The cage is about 4inches across and 12 inches in diameter.
The hood will be 40x24x18inches [40x24 opening].
The ductwork will probably[I'm open yo suggestions] be 5' of 10" flex
for now. [3 horizontal and 2 vertical- no sharp bends]. In a fwew
months we move it all and it will be rigid ductwork- 1' through a
wall, then vertical to a cap.
On 17 Feb 2005 12:42:26 -0800, firstname.lastname@example.org wrote:
It is a real old, bulky, constant capacitor motor. [60's?] I
don't know if the rating system changed or what, but I have a slightly
older 1/12 motor that seems to of the work of a more modern 1/3hp
without bogging down.
That said-- should hp really have anything to do with the cfm's, or
are speed and fan size the determining factors on that end?
Direct-drive, .33HP electric motor features a spark- resistant 7.625-inch
impeller wheel. Runs at 1750 RPM; provides up to 1015 cubic feet per minute
of free air displacement @ O" static pressure. Other sizes available.
NOTE THE 0" static pressure!
further quote from page
The hood features a 10 " round discharge; this allows easy connection to
your in-house exhaust system to provide the internal negative pressure
necessary to safely remove fumes from the work surface. This hood is
completely noncontaminating and resists a wide range of corrosive materials;
select stainless or cold rolled steel.
Thanks - good idea.
I was real disappointed at first-- but the 12" in that case is overall
dimension. The blower is only 5 1/4".
Can't find any indication of how wide those wheels are, but on p590
there's a 1150rpm that is 10 5/8" diameter and has roughly the same
outlet size. It is blowing 1500-1870cfm. [and is powered by a 3/4 hp
motor!] I hope mine doesn't move that much air.
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