Thermo Pride C Premiere Series - Manual (Page 8)

F. DUCT SYSTEM
The duct system and load sizing calculation should follow the design standards of Air Conditioning
) loss on the supply systems.
f the system's components (trunk lines,
grill free areas) must be properly sized and matched together. A 12x8 duct
ith a 400 CFM capacity, for example, WILL NOT flow 400 CFM if the register(s) can only flow a total of
ST BE EQUAL TO
Contractors of America (ACCA) - Manuals D&J -or the American Society of Heating, Refrigeration & Air
Conditioning Engineers, Inc. (ASHRAE) Fundamentals Volume (latest edition).
To quickly aid you in evaluating existing duct systems, review the chart below. The chart shows the CFM
capacity for square inch areas based on .10" W.C. static pressure (SP
To insure the necessary air handling capacity of a duct system, each o
takeoff's, runs and register and
w
200 CFM.
When sizing the return air duct system, the air handling capacity MU the supply system
established by ACCA or ASHRAE on
8
at a minimum. It is recommended that you follow design parameters
the return air duct systems.