79
Appendix D—HeatShift System
Y
Vertical Rise
X
Max. Allowable
Horizontal
Offset
30”
24”
36”
36”
42”
48”
48”
60”
54”
72”
60”
84”
66”
96”
12’-0”
96” Max.
Min. 2-1/2”
clearance
to ceiling
Min. 1”
clearance to
combustibles
around pipes
Support horizontal
sections of pipe using
strapping every 24”
DO NOT RUN
pipe horizontal.
Minimum slope 4:12
Min. bend
radius
8”
5”
5”
4
12
Vertical Rise
‘Y’
(Min. 30”
Max. 12’-0”)
Maximum allowable Horizontal Offset
‘X’
(offset for take-off
that’s furthest away)
Ceiling
LDK 1, LDK 3 or LDK 4
+
Min. bend
radius
+
Top of fireplace
Min. 1”
clearance to
combustibles
around pipes
Support horizontal
sections of pipe using
strapping every 24”
DO NOT RUN
pipe horizontal.
Minimum slope 4:12
Min. bend
radius
14”
min.
5”
5”
4
12
Vertical Rise
‘Y’
(Min. 30”
Max. 12’-0”)
Maximum allowable Horizontal Offset
‘X’
(offset for take-off
that’s furthest away)
LDK 7 - Duct
Termination Plates
+
Min. bend
radius
+
Top of fireplace
Ceiling
Min. 2-1/2” opening required at ceiling
With Plenum
With Plates
