5-565.1
5
duct installation
duct installation
furnace discharge duct connection
1. The furnace discharge is designed to accept straight
ductwork. (See Figure 5.1.) Provide an airtight seal
between the ductwork and the furnace. Seams with cracks
in the ductwork should be caulked and/or taped and be of
permanent type. All duct connections MUST be airtight to
prevent air leakage.
2. Provide removable access panels on the downstream side
of the ductwork. (See Figure 5.1.) This opening should be
large enough to view smoke or reflect light inside the casing
to indicate leaks in the heat exchanger and to check for hot
spots on heat exchangers due to poor air distribution or lack
of sufficient air (CFM).
Blower section and cooling cabinet discharge duct
connections
The blower section back and bottom and cooling cabinet
section discharge are designed to accept 90° flanged ductwork.
(See Figure 5.3.) Provide an airtight seal between the ductwork
and the unit. Seams with cracks in the ductwork should be
caulked and/or taped and be of permanent type. All duct
connections MUST be airtight to prevent air leakage.
*DIMENSION "B" SHOULD NEVER BE
LESS THAN 1/2 OF DIMENSION "A".
AIR
FLOW
SIDE VIEW
PROVIDE LEAK TIGHT ACCESS PANELS
IN SIDE OF DISCHARGE DUCT FOR
HEAT EXCHANGER INSPECTION
*DIMENSION "B" SHOULD NEVER BE
LESS THAN 1/2 OF DIMENSION "A".
AIR
FLOW
PROVIDE LEAK TIGHT ACCESS PANELS
IN SIDE OF DISCHARGE DUCT FOR
HEAT EXCHANGER INSPECTION
TOP VIEW
B*
12" MINIMUM
3" MINIMUM
TURNING VANES
3" MAXIMUM
A
B*
3" MINIMUM
TURNING VANES
3" MAXIMUM
A
12" MINIMUM
figure 5.2 - recommended field installed discharge
duct configurations for Blower Package units
figure 5.1 - furnace discharge duct connection
figure 5.3 - Blower section and cooling cabinet
discharge duct connections
DUCTWORK
WITH 90°
1/2" FLANGE
1/2"
3. Provide uniform air distribution over the heat exchanger. Use
turning vanes where required to obtain uniform air distribution.
(See Figure 5.2).
BLOWER OR
COOLING COIL
SECTION
