10
AIR DISTRIBUTION SYSTEMS
For proper air distribution, the supply duct system shall be
designed so that the static pressure does not exceed the
listed static pressure rating on the furnace rating plate.
Three typical distribution systems are illustrated in
Figure 6.
Location, size and number of registers should be selected
on the basis of best air distribution and floor plan of the
home.
The Air Temperature Rise is to be adjusted to obtain a tem-
perature rise within the range(s) specified on the furnace
rating plate.
A
Single trunk duct
Dual trunk duct
Transition duct
*
B
S
1
Crossover Duct must be centered directly
under
furnace.
S
2
Use 12” Diameter Round or equivalent insulated Flex---duct only.
S
3
Terminate Flex---duct (opposite furnace) in the
center
of the trunk duct.
S
4
Flex---duct material must be pulled tight — No Loops or unnecessary dips
— Air Flow may be impeded.
1
2
3
4
B *
Dual trunk duct with crossover connector
Crossover
C
Transition Duct with Branches
Branches
Figure 6 — Air Distribution Systems
