Installation Manual

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termination caps for all concentric terminations must
be at the same height measured from ground. See
Multiple Concentric Termination Arrangements on
page 30.
9. Determine if the concentric termination will need to be
shortened to accommadate required clearances or
to ensure all vent caps are tat the same height when
installing multiple terminations vertically through the roof
in the same location.
See Figure 25 for the minimum lengths allowed for the 4 inch
concentric termination.
Note: When shortening the length of the termination carefully
measure and cut the larger (intake air) pipe first. Cut
the same amount of pipe off of the smaller (vent) pipe.
Note: Lengthening of the Concentric Vent Termination is not
permitted.
CONCENTRIC TERMINATION(S)
MUST BE A MINIMUM OF 10 FEET
(3 m) AWAY FROM ANY PARAPET,
VERTICAL WALL OR
STRUCTURE.
6 INCH CONCENTRIC TERMINATION
FLAT ROOF CLEARANCE
Figure 24
CONCENTRIC TERMINATION INSTALLATION
1. Concentric terminations must be ordered separately.
BTH 300 - 500 models must use the 6 inch concentric
termination for both 4" & 6" vent diameters; Part Number:
9008841005. Contact your local distributor or call the
parts department phone number on the back cover of this
manual to order concentric terminations.
2. Determine the location for the termination.
NOTE: Roof termination is preferred since it is less
susceptible to damage, has reduced chances to intake
contaminants and vent vapors are less visible.
3. When installing a concentric termination vertically
through the roof; ensure that all exterior vertical
clearance requirements for the concentric termination,
shown in Figure 24 and Figure 26 on page 29, are being
maintained. These clearances and those cited by local
and national codes must be maintained.
4. When installing a concentric termination vertically
through a flat roof, the termination's vent cap must be a
minimum of 10 feet (3 m) away from any parapet, vertical
wall or structure as shown in Figure 24.
NOTE: If this required distance to a parapet, vertical wall
or structure cannot be maintained, standard terminations
must be used. See Vertical Termination Installation on
page 24.
5. When installing a concentric termination through a
sidewall; ensure that all exterior sidewall clearance
requirements for the termination, shown in Figure 46
on page 36, are being maintained. These clearances
and those cited by local and national codes must be
maintained.
6. When installing multiple concentric terminations vertically
through a roof or horizontally through a sidewall ensure
the required clearances between terminations and
groupings of multiple terminations are maintained. See
pages 30 and 31 for more information.
7. Cut a 7 inch (18 cm) diameter hole for 6 inch concentric
terminations where they will pass through the wall or roof.
NOTE: Beware of concealed wiring and piping when
cutting through the wall or roof.
8. When installing multiple concentric terminations
vertically through the roof in the same location the