
Form I-CAUA, P/N 164771 R8, Page 13
• Pipe diameters
do not differ;
no taper-type
connectors are
required.
FIGURE 6B - Concentric Adapter Box Connections for CAUA Size 250
FIGURE 6C - Concentric Adapter Box Connections for CAUA Sizes 300, 350, & 400
• CAUA Sizes 300, 350,
and 400 always require
a 6” to 5” (152 to 127
mm) reducer in the
vent pipe.
• CAUA Sizes 150 and 200
always require a 5” to 4”
(127 to 102 mm) reducer
in the vent pipe.
• CAUA Sizes 150 and 200
always require a 4” to 5”
(102 to 127mm) enlarger
for attaching combustion
air pipe.
FIGURE 6A - Concentric Adapter Box Connections for CAUA Sizes 150 & 200
Pipe Connections at the Concentric Adapter Box
Horizontal or Vertical?
Is the separated-
combustion vent/
combustion air
system horizontal
or vertical?
Horizontal
Terminal,
Option CC6,
instructions
begin on
page 14.
Vertical
Terminal,
Option CC2,
instructions
begin on page
17.
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