28
Category III or IV - Multiple Installation - Sidewall
1. On installations of multiple MODULATING DELTAS,
terminate each vent pipe as described in this manual.
2. The wall penetration of the vent should be a mini-
mum 18 inches from the adjacent vent pipe of the
other appliance for installations in the U.S. For
installations in Canada, provide clearances as
required by CSA B149.1 or 149.2.
Category III or IV Installation of Vent/Air Piping
Termination Fittings - Horizontal
1. The combustion air pipe termination must include a
factory supplied “bird screen” as shown in Fig. 18.
The bird screen should be inserted inside the termi-
nation.
2. The combustion air piping must terminate at the
appliance with a 90
º
elbow.
3. The vent piping must terminate as shown in Fig. 17 &
17A, page 26.
Do not extend the vent pipe outside the sidewall
beyond the given dimensions shown in Figs. 17
& 17A, page 26. Extended exposure of the vent
pipe could cause condensate to freeze and block
the vent pipe.
WARNING
Bird Screen
*
Combustion Air
Inlet Termination
Elbow
*
Installer must install the factory supplied “bird
screen” in the combustion air inlet termination.
Horizontal - Single Pipe Assembly of
Combustion Air Inlet
Fig. 18:
Termination Clearances of Category III
or IV system
Fig. 19:
