Merry Monk Design on thu 11 aug 05
I have to set up ductwork for a kiln and spraybooth.
My landlord wants me to attach the duct to the chimney
in my space. The chimney has 2 flues. The gas
furnace is already connected to the 1st flue.
Is it OK (healthy? to code?) to vent a kiln and
spraybooth in the same duct, which would connect to
the 2nd chimney flue?
Is it OK to duct the fumes from my gas furnace in the
same duct as the spraybooth?
Assume the chimney is sealed, etc. I am concerned
about backwash and fume/particle mixing. I am
currently solely using ^4-6 glazes.
Thanks,
Amy Sanford
amy@merrymonkdesign.com
(I'm having some email problems, so if you email me
and I don't respond within 2 days, please try
again...)
amy@
__________________________________________________
Do You Yahoo!?
Tired of spam? Yahoo! Mail has the best spam protection around
http://mail.yahoo.com
John Baymore on fri 12 aug 05
Is it OK (healthy? to code?) to vent a kiln and
spraybooth in the same duct, which would connect to
the 2nd chimney flue?
Is it OK to duct the fumes from my gas furnace in the
same duct as the spraybooth?
Assume the chimney is sealed, etc. I am concerned
about backwash and fume/particle mixing. I am
currently solely using ^4-6 glazes.
Amy,
Codes used in various localities can vary greatly..... so it is hard to say
exactly "from afar". You have a good "gut level" response about what to be
concerned about here.
Generally speaking, it is typically illegal for a spray booth and and a
fuel fired unit to share the same flue. You may find that it is also
illegal according to the codes in your locale for more than one fuel fired
appliance to be vented into the same flue. You didn't say in your post if
your kiln is fuel fired or electric. I am assuming that it is electric.
You say the "chimney is sealed"...... but think this through fully. The
chimney itself IS (hopefully ) sealed.... but if there are TWO
appliances connected to it....... it is NOT sealed really...... there are
always the opening(s) to the OTHER appliance connected to it! So ...... it
is possible that the spray booth fan will generate a volume of air trying
to get out the existing duct (flue) that will raise the static pressure in
the duct (flue) to such a point that the gas furnace (or kiln vent) will
not operate correctly. Or worse... it could cause a flow back into the
other unit.
The design of the flow of gases in a tube is a lot more complicated than it
appears at first glance and venting stuff correctly can get a bit
complicated. That's why God created HVAC engineers . A gas furnace is
designed (as is a fuel fired kiln) to "see" a certain differential in
pressure between the interior and the exterior. If you change that
pressure relationship... you change how it is working. If you change it
enough... you can stop it from working correctly at all.
It's important to not also that you can also have a vent fan noisily
churning away on an appliance or in a room....... but not really moving
much or any air/gases.
And I am ASSUMING here that you are spraying ONLY water based materials in
the booth. But if you (or someone else) happens to one day see that nice
handy spray booth and decides to spray something like charcoal fixative or
gold luster .... with flamable organic solvents in them........ KABOOM!!!!
It is POSSIBLE (from a practical point of view....not necessaruily a "code"
point) that as long as you are NOT spraying any solvent based stuff, that
you could share the same vent duct between an oxidation or neutral fired
ELECTRIC kiln vent system and the spray booth. The electric kiln vent
carries very low grade heat. The main issue there would be making sure
that the relatively high volume spray booth fan/blower did not cause the
low volume / pressure electric kiln vent to stop functining....or worse .
For some "legal protections" here ... I'd suggest that if he TELLS you to
do something a certain way in this installation... get the instructions in
WRITING. That way if there is ever a code complaince issue with the4 town
or if a "claim for damages" of some sort arises...... you can prove that it
was not YOU who decided how to do this installation. Again....codes vary.
In your locale... is it the landlords responsibility that a tennant complys
with codes in installing equipment... or is it the tennants? You
should "do your homework".
Really..... the existiing flues should be evaluated for what you are going
to do with them by someone who KNOWS what they need to do. Otherwise, you
(actually... your landlord).... is taking chances.
best,
...............john
John Baymore
River Bend Pottery
22 Riverbbend Way
Wilton, NH 03086 USA
JBaymore@compuserve.com
http://www.JohnBaymore.com
"Please use compuserve address for any direct communications."
| |
|
