Avalon Firestyles 796-1990 to 1993 - Manual (Page 5)

Page 5
CHIMNEY INFORMATION & REGULATIONS
Whether you install your wood heating appliance with a factory-built chimney or masonry chimney, there
are certain rules that must be followed. The following guidelines for chimney installation are included in
this manual to augment the information supplied with either the manufacturer's information for factory-built
chimneys or to insure that your present masonry chimney is suitable for this wood heating appliance. Do
not use makeshift methods or compromise in installation of any chimney equipment.
The 3-Foot, 2-Foot, 10-Foot Rule
The 3-foot, 2-foot, 10-foot rule states that all chimneys (factory-built or masonry) must be:
1. At least 3 feet higher than the highest part of the roof opening through which it passes;
2. And at least 2 feet higher than any part of the roof within 10 feet, measured horizontally. A chimney
must meet requirement #1 and requirement #2. This rule, required by all building codes, applies to
both factory-built and masonry chimneys.
Minimum Chimney Height on a Sloped Roof
2' Minimum
10' 3' Minimum
Ridge
Minimum Chimney Height on a Flat Roof
42"
24"
18"
Less
Than 10'
36"
6"
10' or Greater
Wall or
Parapet
"A" "B"
These minimum chimney heights are required by building codes for safety purposes, to allow time for
sparks exiting a chimney to cool before they land on the roof. In some problematic situations, additional
chimney height above the specified minimums may be necessary to reduce wind-induced down drafting
and back puffing, or to increase draft, thereby improving appliance operating characteristics.