MagnaTherm Boilers and Water Heaters
Page 17
84”
213
12”
Figure 6. Multiple Side-Wall Terminals,
Air and Vent
Figure 7. Minimum Venting Distance
3.E.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 unit is side-wall vented to the same wall,
use Figure 7 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 6)
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 6).
3.E.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 Unit 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.
3.E.4 Vertical Combustion Air
Terminal
When combustion air is taken from the roof, a
field-supplied rain cap or an elbow arrangement
must be used to prevent entry of rain water.
The opening on the end of the terminal must be
at least 12” (30 cm) above the point at which it
penetrates the roof, and high enough above the
roof line to prevent blockage from snow. When
the vent terminates on the roof, the combustion
air must terminate at least 12” (30 cm) below the
vent terminal.
3.E.5 Installations in the
Commonwealth of
Massachusetts
In Massachusetts the following items are required
if the side-wall exhaust vent termination is less
than seven (7) feet above finished grade in the
area of the venting, including but not limited to
decks and porches. (From Massachusetts Rules
and regulations 248 CMR 5.08.)
1.
Installation of Carbon Monoxide Detectors
