Real Estate Forum

I tried Zyp.  I was actually trying to get his township so he could be
turned into the Fire Marshall.  The more I read, the scarier it got.  I know
the fresh air requirements as well as most of the other techs (other than
stormy).  His 4" sealed combustion is BS too, he'd be sooting up the goddamn
thing by now. IF his furnaces are twinned, he can stage them, but he must
have both blowers running.  Personally I think he must be full of bullshit.
No one can be this stupid and dangerous.

--
Bob Pietrangelo
bobp3@comcast.net (home)
bob@comfort-solution.biz (work)
www.comfort-solution.biz





"Zyp" <nospam@yahoo.com> wrote in message
news:Y6WdnfEpCNtnwB_anZ2dnUVZ_rCtnZ2d@championbroadband.com...
> HVAC Guy wrote: 
>
> You can not reason with this dumb XXX.  Give it up.
>
> If you read your Whitman / Johnson, you would have seen that - if you duct
> in combustion & dilution air, your requirements are 1 sq. in., per 1,000
> btu/h input to the appliance.  If your crappy furnace is a 100,000 btu/h,
> you need at least 100 square inches for both combustion and dilution.
> Older draft hood furnaces will require 29 cu. feet of air to 1 cu. foot of
> fuel burned.  That's 1 cu foot of fuel, 10 cu. foot of air to burn, 5 cu.
> foot of secondary air, and 15 cu feet of dilution.  Any change in that
> will interfere with the combustion process.  Also, you need 3.5 in.
> w.c.manifold pressure feeding the burners.  Anything less will interfere
> with complete combustion.  The result of which will be aldhyde formation,
> CO, and soot. If, for any reason, your soot plugs up the inside of the
> heat exchanger (over time) you will smoother the burner flame and have an
> even more hazardous condition than the one you're creating.  Be well
> advised that if your utility saw what you did, they'd red tag the furnace.
> And, if you persisted in arguing with them, they'd shut off the fuel
> service because it is a hazardous use of the fuel.
>
> All of this does not include ventilation around the appliance.  Most
> furnaces are approved with 0" clearance in the back, 1" clearance on the
> sides and 6" clearance in the front provided that you have ventilation to
> cool the appliance.  [Look at the nameplate tag on the furnace.]  Keep
 it
> up, you will have a fire some day if you don't kill someone first.
>
> And BTW:  the draft hood serves two purposes, one is to prevent
> backdrafting to the burners.  By enclosing the drafthood, you've given an
> opportunity for a backdraft.
>
> One of the problems with ducting in the combustion air is the opportunity
> for blockage.  Those furnaces with direct venting approval, have pressure
> controls to monitor this.  You do not.
>
> The only thing you did good, was to seal the return air on the bottom.
> [Required to prevent conditioned air from mixing with the combustion a
ir.]
>
> --
> Zyp
>

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