Bryant ZONE PERFECT PLUS - Page 19

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Starting from Step 6, we need to multiply the Main Duct Square Inches by 1.1 and the Branch Area
by 1.25.
Example: Zone 1 - Main Duct - 86x1.1 = 95 Sq.In.
Branch Area - 132x1.25 = 165 Sq.In.
Step 6: Zone Minimum Area (Sq.In.) (From Table 1)
Zone 1 CFM ___400____Main Duct ___95____Sq.In. Branch Area__165____Sq.In.
Zone 2 CFM ___500____Main Duct __124____Sq.In. Branch Area__206____Sq.In.
Zone 3 CFM ___300____Main Duct ___96____Sq.In. Branch Area__138____Sq.In.
Zone 4 CFM ___700____Main Duct __157____Sq.In. Branch Area__289____Sq.In.
Zone 5 CFM __________Main Duct _________Sq.In. Branch Area_________Sq.In.
Zone 6 CFM __________Main Duct _________Sq.In. Branch Area_________Sq.In.
Zone 7 CFM __________Main Duct _________Sq.In. Branch Area_________Sq.In.
Zone 8 CFM __________Main Duct _________Sq.In. Branch Area_________Sq.In.
Step 7: Main Trunk (Table 2A) and Branch Duct Size (Table 2B) Sizes
Zone 1
Main Duct Square Inches ___95____ Main Duct Size___8x14____
Table 2A Main Duct Sizing
Equivalent Areas for Ducts (sq.in.)
Duct Height (in.) Round
Duct Width 8 10 Dia-Inch Sq.In.
86080 850
10 80 87 10 79
12 90 110 12 113
14 105 135 14 154
16 115 157 16 201
18 125 167
DUCT SIZING WORKSHEET-EXAMPLE 3
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