SERVICE
Figure 5
As you can plainly see as the flue size goes up, the percentage of over sizing does too. With an 8 inch x 8 inch clay liner, you have 42 square inches
and that means you have a 350 percent oversized chimney. But with a 12
inch x 12 inch chimney, you are 850 percent oversized at 102 square inches,
and except in really cold weather, that chimney's not going to be able to
do much for you.
It's just the math again, and it doesn't come out. Again, just my opinion,
but many OEMs are still showing the 8" x 8" x 20' as gospel and that sizing
is 60 years old and obsolete.
By the way and like I said, installing a new gas or oil fired appliance into
an unlined masonry chimney is in violation of most building codes and
NFPA Standards 211 for oil and 54 and 58 for gas. You might want to think
about that before your insurance agent calls.
See ya. l F O N
*George Lanthier is the owner of Firedragon Academy, a Massachusetts
Certified School and a publishing and consulting firm. He is the author of
over 50 books and manuals on gas and oil heating and HVAC subjects. He
is a CETP, NATE, NORA, PMAA and PMEF Proctor and a Massachusetts
Certified Instructor. He can be reached at 608 Moose Hill Road, Leicester,
MA 01524. His phone is 508-421-3490 and his website can be found at
www.FiredragonEnt.com.
www.fueloilnews.com | FUEL OIL NEWS | JUNE 2013
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