Lennox RAVELLE 30 Installation And Operation Instructions Manual page 13

Raised Installations
The fireplace may be raised by building a platform of sufficient strength to
support the fireplace and pipe . When building a raised hearth extension,
please see the note below regarding height of the fireplace in relation to
the thickness of the hearth extension material .
Raised Platform
for Hearth Extension
Raised Platform
and Fireplace
for Hearth Exten-
Figure 6
sion and Fireplace
Raised Raised
Platform
Platform
Figure 7
Hearth Extension Considerations
It is IMPORTANT to note that there is a 1" space between the base of the
fireplace and the bottom of the fireplace face . See Page 13 for hearth
extension requirements . This space will allow a 7/8" (22 mm) thick hearth
extension (including backer board if desired) . Should a hearth extension
thicker than 7/8" (22 mm) be desired, the height of the fireplace must
be raised the thickness of that hearth extension less the 7/8" (22 mm) .
For example, if a 2-7/8" (73 mm) thick cultured stone is to be placed
on the floor to serve as the hearth extension, then the fireplace must be
raised 2" (possibly using 1/2" (13 mm) plywood over 2 x 4's laid flat)
to accommodate the 2-7/8" (73 mm) stone . It is important to note that
if the fireplace is raised, then it is necessary to raise the height of the
header above the stand-offs an equal amount .
Figure 8
Nailing
Nailing
Plate
Plate
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Fireplace
Fireplace Face
Face
Base of Fireplace
Base of Fireplace
One Inch Space
One Inch Space
13