[TheForge] forge flues

[Bruce Freeman]

A properly constructed flue and hood will produce its
own positive ventilation.  That's what a flue is all
about.

I had a 6" dia flue mounted close to the fire that
pulled so well that smoke leaking out the bottom of
the forge table would come up around the side and
travel horizontally across the fire to get to the
flue.

I've always felt putting a fan in a flue is
counterproductive.

Bruce
NJ

--- Peter Hirst <saltydog335 at aol.com> 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
> > _______________________________________________
> > Manage membership or unsubscribe at:
> > http://mailman.qth.net/mailman/listinfo/theforge
> > theforge mail list group photo site is
> > http://www.photoaccess.com
> > Login:  blacksmithblacksmith at hotmail.com
> > password:  anvil
> > ___________
> >
> >
> > 
> 
> _______________________________________________
> Manage membership or unsubscribe at:
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  blacksmithblacksmith at hotmail.com
> password:  anvil
> ___________
> 
> 
> 



      ____________________________________________________________________________________
Be a better friend, newshound, and 
know-it-all with Yahoo! Mobile.  Try it now.  http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ