LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 17)

MagnaTherm Boilers and Water Heaters Page 13
3.3.2 Side Wall Combustion Air Terminal
Consider the following when installing the terminal.
1. Do not locate the air inlet terminal near a
source of corrosive chemical fumes (e.g.,
cleaning fluid, chlorine compounds, etc.).
2. Locate the terminal so that it will not be subject
to damage by accident or vandalism. It must be
at least 7 feet ( 2.1 m) above a public walkway.
3. Locate the combustion air terminal so that it
cannot be blocked by snow. The National Fuel
Gas Code requires that it be at least 12 inches
(30 cm) above grade, but the installer may
determine it should be higher, depending upon
local conditions.
4. If the MagnaTherm is side-wall vented to the
same wall, use Figure 4 to determine the proper
mounting locations.
5. Multiple vent kits should be installed such that
the horizontal distance between outlet group
and inlet group is 84” (213 cm). (See Figure 5)
6. The vent outlet must be at least 12” above the top
of the air inlet, and must be at least 84” (213 cm)
horizontally from the air inlet. (See Figure 5).
3.3.3 Vertical Vent Terminal
When the unit is vented through the roof, the vent
must extend at least 3 feet (0.9 m) above the point
at which it penetrates the roof. It must extend at
least 2 feet (0.6 m) higher than any portion of a
building within a horizontal distance of 10 feet (3.0
m), and high enough above the roof line to prevent
blockage from snow. The vent terminal offered with
the MagnaTherm can be used in both vertical and
horizontal applications. When the combustion air is
taken from the roof, the combustion air must terminate
at least 12” (30 cm) below the vent terminal.
84”
213
12”
Figure 4. Minimum Venting Distance
IMPORTANT: All terminals must be placed so that they remain at least 12”
above the expected snow line. Local codes may have more specific
requirements, and must be consulted. Refer to the NFPA54 National Fuel Gas
Code and your local codes for all required clearances for venting.
84
Figure 5. Multiple Side-Wall Terminals, Air and
Vent
cannot enter the building through doors,
windows, gravity inlets or other openings.
Whenever possible, avoid locations under
windows or near doors.
5. Locate the vent terminal so that it cannot
be blocked by snow. The installer may
determine that a vent terminal must be
higher than the minimum shown in codes,
depending upon local conditions.
6. Locate the terminal so the vent exhaust does
not settle on building surfaces or other nearby
objects. Vent products may damage surfaces or
objects.
7. If the boiler or water heater uses ducted
combustion air from an intake terminal located
on the same wall, see See Figure 5 and Figure
4 for proper spacing and orientation.
If the vent termination is located in an area exposed
to high winds, an optional PVC tee (the same
diameter as the vent pipe) may be used. The tee’d
vent termination offers greater protection from wind
related operating issues.