Lennox Hearth MERIT PLUS MP-36OD - Manual (Page 12)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE. 12
3. Cut or frame a hole through the outside
wall for the installation of the duct inlet
hood. A 6-1/2" (165 mm) diameter hole is
required. Feed the loose end of the fl exible
duct through the hole cut for the inlet hood
and attach to the collar on inlet hood using
two (2) screws. Insert the hood into the
opening. Secure in place with nails driven
through the holes in hood fl ange. Seal with
noncombustible waterproof silicon type
caulking. If additional air duct is needed,
use Class 0 metallic duct.
Steps 6 - Install Air Gate Kit
(Required on All Indoor Instlaltions. When
an Outside Air Kit is installed, see assembly
steps on Page 6).
Install the Air Gate Kit per the instructions
provided with kit and on Page 6 (see Page 23
for ordering information).
Step 7. Outside Air Kit (provided)
(Required on All Outdoor Instlaltions)
Install the Outside Air Kit per the instructions
provided with kit and on Page 7.
Step 8. Route the Class 0 metallic air duct per
the instructions on Page 8.
Step 9. Cut or frame a hole through the outside
of the enclosure for the installation of the duct
inlet hood per the instructions on Page 8.
INSTALLING THE CHIMNEY SYSTEM
Step 1. Before continuing, check the operation
of the damper, as described on Page 5, (refer
to Figure 3).
Step 2. Using standard construction framing
techniques, construct opening for chimney route
up through the ceiling(s) and roof or through
an outside chase.
Framing must maintain adequate minimum air
space clearance at all times.
Figure 28
A minimum 1"* air space must be reserved for
all combustible materials extending for any
continuous length surrounding the chimney.
*Note: 2" clearance to combustibles required
in Canada. 2” déblayage aux combustibles
exigés au Canada.
Reference Figures 19 & 20 and charts Framing
Dimensions for Ceiling and Roof, which specify
minimum ceiling and roof dimensions.
In new construction, to determine chimney center
line, use plumb line from roof or ceiling above
fi replace to center of fl ue collar on fi replace.
For remodeling, plumb to center of fl ue collar
from ceiling above, drive nail through ceiling
from below to mark position, then mark and
cut to passage from above ceiling (around
nail) (see Figure 28). Then plumb from ceiling
or roof level directly above hole which has just
been completed.
Step 3. Position appropriate fi restop spacer
at ceiling and nail temporarily with two (2) 8d
nails. Use fl at fi restop spacer, Model F8FS, if
chimney penetrates ceiling vertically. If chimney
penetrates ceiling at 30° angle (offset chimney),
use 30° fi restop spacer, Model F8FS30. Use one
nail on opposite sides to hold fi restop spacer in
position. Nail permanently, using at least two (2)
more 8d nails, after chimney sections have been
assembled through the fi restop spacer and after
any necessary adjustments have been made.
Firestop spacer must be secured by at least four
(4) 8d nails when completely installed.
Notes:
Indoor Installations: If there is a room above
ceiling level, fi restop spacer must be installed
on the bottom side of the ceiling. If an attic is
above ceiling level, fi restop spacer must be
installed on top side of ceiling joist (Figures
29 & 30).
Outdoor Installations: If patio installation
requires that a chimney passes through a roof
or room above, be sure to comply with all local
building codes.
Firestop Spacer
Room Above
Firestop Spacer
Attic Above
Figure 29
Figure 30
CAUTION
Allow minimum 1"* chimney air
space to insulation and building
materials throughout vertical or
offset chimney installation.
ATTENTION
Permettez à minimum 1 pouce*
espace aérien de cheminée à
l’isolation, aux matériaux de
construction et aux membres
encadrants dans toute la verti-
cale ou excentrez l’installation
de cheminée.