Lennox International Inc. MERIT PLUS MPB3530CNM-B - Manual (Page 5)

5
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS ® B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
Figure 3: Typical Installations
When the unit is installed with one side flush with a
wall, the wall on the other side of the unit must not
extend beyond the front edge of the unit.
Offset
Venting
Vertical
Venting
Shown with Outside Air Kit
installed (model FOAK-4 or
FOAK-4LD)
VENT TERMINATION CLEARANCES
Gas Vent Rule - Gas vent caps are not
permitted within 8 feet (2.4 mm) of a vertical
wall or similar obstruction. Gas vent caps
that are located 8' or more from a portion of
a building which extends at an angle greater
than 45° upward from the horizontal may
terminate in accordance with Figure 4,
provided that in no case shall any discharge
opening on the cap be less than 2' (610 mm)
horizontally from the roof surface (National
Fuel Gas Code ANSI Z223.1 (NFPA 54) Gas
Vent Termination) (CAN/CGA B149.1).
MULTIPLE TERMINATIONS
These appliances may vent adjacent to and at
the same level with any other gas appliances
(including direct-vent appliances) provided
that there is at least 2 ft. (0.6m) between
the proximal edges of the vent caps. These
appliances may be vented adjacent to a
chimney vent servicing a solid fuel fi replace
provided the B-vent cap is at least 2 ft.
(0.6m) away from the nearest point of the
chimney opening.
Termination Heights For Vents
Above Flat Or Sloped Roofs
Ref. NFPA 54 / ANSI Z223.1
Roof Pitch Feet Meters
Flat to 6/12 1.0 0.3
6/12 to 7/12 1.25 0.38
7/12 to 8/12 1.5 0.46
8/12 to 9/12 2.0 0.61
9/12 to 10/12 2.5 0.76
10/12 to 11/12 3.25 0.99
11/12 to 12/12 4.0 1.22
12/12 to 14/12 5.0 1.52
14/12 to 16/12 6.0 1.83
16/12 to 18/12 7.0 2.13
18/12 to 20/12 7.5 2.29
20/12 to 21/12 8.0 2.44
Figure 4: Vertical Vent Termination Clearances
Roof Pitch is X/12
Minimum Height from Roof to
Lowest Discharge Opening
X
12
1“ (25 mm)
Minimum
LOCATION
In selecting the location, the aesthetic and
functional use of the appliance are primary
concerns. However, vent system routing to
the exterior and access to the fuel supply are
also important.
Due to high temperatures, the appliance
should be located out of traffi c and away
from furniture and draperies (Figure 3).
En raison des températures élevées,
l’appareil devrait être installé dans un
endroit où il y a peu de circulation et loin
du mobilier et des tentures (Figure 3).
The location should also be free of electrical,
plumbing or other heating/air conditioning
ducting.
Be aware that this is a heat producing
appliance. Objects placed above the unit
are exposed to elevated temperatures.
Do not insulate the space between the
appliance and the area above it (see
Figure 9 on Page 8).
The appliance must be mounted on a
fully supported base extending the full
width and depth of the unit. The appliance
may be located on or near conventional
construction materials. However, if installed
on combustible materials, such as carpeting,
vinyl tile or other combustible material other
than wood fl ooring, the appliance shall be
installed on a metal or wood panel extending
the full width and depth of the appliance.