Bryant 987MA Installation, Start-Up, Operating And Service And Maintenance Instructions page 53

Attach gaskets to vent pipe and
combustion air adapters.
MODULATING INDUCER ASSEMBLY
Fig. 38 - - Combustion Air and Vent Pipe Diameter Transition Location and Elbow Configuration
Fig. 36 - - Vent Coupling and Adapter with Gaskets
INDUCER OUTLET
Fig. 37 - - Inducer Vent Elbow
(Appearance May Vary)
FURNACE
NOT IN
HORIZONTAL
SECTION
Vent Coupling and Adapter
VENT ELBOW CLAMP
TORQUE 15 LB-IN.
PIPE DIAMETER
TRANSITION IN
VERTICAL SECTION
53
A13074
VENT PIPE CLAMP
TORQUE 15 LB-IN.
VENT ELBOW
A11286
A93034