7
A
B
C
Figure 1
EFFECtIVE LEngtH
When assembling two parts together, the
joint will overlap 5/8”. So effective length is
nominal length minus 5/8”.
Effective Length
Example
Material
L36
35 3/8"
L24
23 3/8"
L18
17 3/8"
L12
11 3/8"
Table 2
Clearances
Model
B.H.A Chimney
1400°F Chimney
DIS
1"
1"
DAS
4"
4"
opEnIng tHrougH ComBuStIBLE
ConStruCtIon
The following table serves to identify the
minimum opening required when installing a
chimney through a floor, wall or roof made of
combustible material. See Table 3 and Figure 1.
Table 3
DIS Minimum Openings
Model
Roof / Floor (C)
Wall (C)
Ø5" - Ø10"
Inside Ø + 8"
Inside Ø + 8"
Ø12" - Ø36"
Inside Ø + 8"
Not Listed
Table 4
DAS Minimum Openings
Model
Roof / Floor (C)
Wall (C)
Ø5" - Ø10"
Inside Ø + 12"
Inside Ø + 12"
Ø12" - Ø36"
Inside Ø + 12"
Not Listed
WarnIng
Do not InStaLL any typE oF
InSuLatIon In tHE rEQuIrED
CLEaranCE SpaCES SurrounDIng
tHE CHImnEy.
CLEaranCES
DIS
Minimum air space clearance to combustible
construction to model DIS Chimney is 1”.
For non-combustible construction, maintain
clearances as required for installation, access
for inspection or per local code.
DaS
Minimum air space clearance to combustible
construction to DAS chimney is 4”.
See Table 2.
Chimney Outside
Diameter
Chimney Inside
Diameter
2" Insulation
Clearance Opening
Openings - Minimum
opening required when
installing a chimney through
a floor, wall or roof made of
combustible material.
