[TheForge] forge flues

[GRAF]

If the flue is set up with enough size and height it will draw like a 
banshee with just the room ambient heat to make it work.
Kitchen vents in restaurants don't work without fans because they lack 
the stack height usually and have filters which restrict the flow.

Mike Graf


Peter Hirst wrote:
> One more thought if you can stand it.  Something to watch out for: 
> "positive ventilation".  I had a fire and health inspector come by 
> recently who asked me if my forge was positively (power) vented (it 
> isnt).   There is no specific standard in this jusridiction for forges 
> (as there is for coal stoves, wood stoves and everything else), and 
> the concern was that the flue gases  are NOT HOT ENOUGH to draw well.  
> Just like over a stove or gas grill in a commercial kitchen, the heat 
> from an open fire mixes with a lot of ambient air on its way toward 
> the hood, and  is not very hot at all as it travels up the flue.  
> That's why commercial kitchen hoods are POWERFULLY positive vented.  
> With a coal forge,   this usually means that significant smoke escapes 
> the hood and the least back pressure stops the draft altogether.  How 
> many of us with coal forges have shops as smokeless as a commercial 
> kitchen?  Or as any room with a properly vented wood stove? Anybody?  
> I didn't think so.
>
> So I would soft pedal the idea that the flue gases don't get very 
> hot.  This could work against you and lead your inspector to conclude 
> that the forge should have a high powered exhaust fan.  Which it 
> probably should, but why press it?
>
> pgh
>
>
>
>
> ----- Original Message ----- From: "john ortery" 
> <bluestoneforge at gmail.com>
> To: <theforge at mailman.qth.net>
> Sent: Monday, January 14, 2008 7:36 PM
> Subject: [TheForge] forge flues
>
>
>> Thanks guys,This seems to be the thought all around.  Most of the 
>> people I
>> talked to seem to think that as long as you have double wall pipe at the
>> exit point and are insulated from any combustible material all should be
>> well.
>> Thanks again Allen Ortery
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