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Appendix D—HeatShift System
Framing and Clearances—Plenums, side view
4”
8”
LDK 1 & 4
LDK 3
Framing
“on edge”
1-1/2” min. clearance
to combustibles (top)
2” min. clearance
to combustibles
(use steel stud for
LX2 appliances)
2” min. clearance
to combustibles
(use steel stud for
LX2 appliances)
Ceiling
Min. 2-1/2” clearance to ceiling
1/2”
5”
1/2” min.
clearance to
combustibles
rear & sides
1” min.
clearance to
combustibles
all around pipes
Plenum
support
(wood)
Maintain 1”
clearance
to pipes
Framing
“on edge”
1-1/2” min. clearance
to combustibles (top)
Ceiling
Min. 2-1/2” clearance to ceiling
1/2”
1/2” min.
clearance to
combustibles
rear & sides
1” min.
clearance to
combustibles
all around pipes
4”
LDK9
Framing
“on edge”
1-1/2” min. clearance
to combustibles (top)
2” min. clearance
to combustibles
(use steel stud for
LX1 appliances)
Ceiling
Min. 2-1/2” clearance to ceiling
1/2”
1/2” min. clearance to
combustibles rear & sides
1” min.
clearance to
combustibles
all around pipes
Non-combustible
plumber’s strap
(or similar)
Strap to rear
wall or stud