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OPTION 3 and OPTION 4 are permitted when installing the MAX CADDY add-on with an existing furnace whose hot
air plenum ducts are downwards flowing. The hot air plenum of the MAX CADDY add-on must be above the add-on
and cannot be directed downward.
Do not install connecting ducts in a way that would allow inversion of the air flow (see example 1 and 3).
The transfer duct between the existing furnace and the add-on must be at least 540 square inches (0.35 m
deviations radius must be at least 6" (152 mm). (See OPTION 1 and 2).
MAX CADDY
MAX CADDY
Option 1
Option 2
*Minimum duct size 540
square inches (0.35 m
*R = Minimum radius 6 inches
2
) and
2
)
15
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