[TheForge] coal forge exhaust system

[CGRAF]

As my shop leaks like a sieve I did forget the need to mention 
replacement air volume. You are quite right about opening a door or window..

My current blower is an OLD 18 dia inch belt drive. I like that the 
motor is not in the soot stream and that because of its size it runs 
slower than any direct drive would and handles the same air volume.

Mike Graf

On 11/18/2013 10:16 AM, Mike Spencer wrote:
>
>> Mike, what kind of air flow would you expect from a squirrel cage,
>> and why is that really different from a ducted fan in this
>> application?
>
> The other Mike here...
>
> Anecdotal answer:  I have a squirrel cage blower over my welding
> table.  It doesn't *appear* to have a stupendous suck, that is,
> welding fumes sometimes escape if the work isn't directly under the
> very small hood that's 4' above the table.
>
> But if I turn it on while I have a forge fire lit and forget to open
> at least one door in my already not-very-tight building, the 16'x13"
> forge flue draws backwards and fills the shop with coal smoke. So it's
> moving quite a lot of air pretty fast.
>
> There was a rash of furnace replacements around here.  Squirrel cage
> blowers started showing up at the roadside on Big Junk Day and I
> collected a couple in good condition. One in place with a junk washing
> machine motor and a spare blower just in case.  Price was right.
>
>
> - Mike
>