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MANUAL ZONE SIZING
Auto Zone Sizing is the optimal way to determine the amount of air flow into each zone, but this process is not
mandatory. Zone sizes can be set manually using the following guidelines.
EXAMPLE (highlighted below): A 2-zone, 3-ton AC system is configured to move 1200 CFM. Zone 1 has a
12" zone damper and Zone 2 has a 16" zone damper.
The Normal sizing strategy would set Zone 1 at 43% and Zone 2 at 81%. If Zone 1 had two dampers (6" and
10") the zone size % should be added together (11% & 33%) and set to 44%.
Damper
Damper
Damper
500
Diameter
Diameter
Diameter
CFM
CFM
4"
9%
12%
6"
19%
27%
7"
26%
36%
8"
34%
48%
9"
44%
61%
10"
54%
78%
12"
79%
100%
14"
100%
100%
16"
100%
100%
18"
100%
100%
Damper
Damper
Damper
900
CFM
CFM
Diameter
Diameter
Diameter
4"
5%
7%
6"
11%
15%
7"
14%
20%
8"
19%
27%
9"
24%
34%
10"
30%
43%
12"
44%
58%
14"
58%
84%
16"
77%
100%
18"
100%
100%
Damper
Damper
Damper
1300
Diameter
Diameter
Diameter
CFM
CFM
4"
3%
5%
6"
7%
10%
7"
10%
14%
8"
13%
18%
9"
17%
23%
10"
21%
30%
12"
30%
40%
14"
40%
58%
16"
53%
75%
18"
69%
96%
Damper
Damper
Damper
1800
CFM
CFM
Diameter
Diameter
Diameter
4"
2%
3%
6"
5%
8%
7"
7%
10%
8"
10%
13%
9"
12%
17%
10"
15%
22%
12"
22%
29%
14"
29%
42%
16"
38%
54%
18"
50%
69%
18
Damper
Damper
Damper
600
Diameter
Diameter
Diameter
CFM
CFM
16%
4"
7%
10%
35%
6"
16%
23%
46%
7"
22%
30%
62%
8"
29%
40%
79%
9"
36%
51%
98%
10"
45%
65%
100%
12"
66%
87%
100%
14"
87%
100%
100%
16"
100%
100%
100%
18"
100%
100%
Damper
Damper
Damper
1000
CFM
CFM
Diameter
Diameter
Diameter
9%
4"
4%
6%
19%
6"
10%
14%
26%
7"
13%
18%
34%
8"
17%
24%
44%
9"
22%
31%
54%
10"
27%
39%
78%
12"
40%
52%
100%
14"
52%
76%
100%
16"
69%
98%
100%
18"
90%
100%
Damper
Damper
Damper
1400
Diameter
Diameter
Diameter
CFM
CFM
6%
4"
3%
4%
13%
6"
7%
10%
18%
7"
9%
13%
24%
8"
12%
17%
30%
9"
16%
22%
38%
10"
19%
28%
54%
12"
28%
37%
73%
14"
37%
54%
96%
16"
49%
70%
100%
18"
64%
89%
Damper
Damper
Damper
1900
CFM
CFM
Diameter
Diameter
Diameter
4%
4"
2%
3%
10%
6"
5%
7%
13%
7"
7%
9%
17%
8"
9%
13%
22%
9"
11%
16%
27%
10"
14%
21%
39%
12"
21%
27%
53%
14"
27%
40%
69%
16"
36%
51%
89%
18"
47%
66%
Damper
Damper
Damper
700
Diameter
Diameter
Diameter
CFM
CFM
13%
4"
6%
9%
29%
6"
14%
19%
38%
7"
19%
26%
52%
8"
25%
34%
66%
9"
31%
44%
82%
10"
39%
56%
117%
12"
56%
74%
100%
14"
74%
100%
100%
16"
99%
100%
100%
18"
100%
100%
Damper
Damper
Damper
1100
CFM
CFM
Diameter
Diameter
Diameter
8%
4"
4%
5%
18%
6"
9%
12%
23%
7"
12%
16%
31%
8"
16%
22%
40%
9"
20%
28%
49%
10"
25%
35%
70%
12"
36%
47%
96%
14"
47%
69%
100%
16"
63%
89%
100%
18"
82%
100%
Damper
Damper
Damper
1500
Diameter
Diameter
Diameter
CFM
6%
4"
3%
4%
13%
6"
6%
9%
16%
7"
9%
12%
22%
8"
11%
16%
28%
9"
15%
20%
35%
10"
18%
26%
50%
12"
26%
35%
68%
14"
35%
50%
89%
16"
46%
65%
100%
18"
60%
83%
Damper
Damper
Damper
2000
CFM
CFM
Diameter
Diameter
Diameter
4%
4"
2%
3%
9%
6"
5%
7%
12%
7"
7%
9%
16%
8"
9%
12%
21%
9"
11%
15%
26%
10"
14%
20%
37%
12"
20%
26%
50%
14"
26%
38%
66%
16"
35%
49%
84%
18"
45%
63%
Damper
Damper
Damper
800
Diameter
Diameter
Diameter
CFM
CFM
11%
4"
6%
8%
25%
6"
12%
17%
33%
7"
16%
23%
44%
8"
22%
30%
56%
9"
27%
38%
70%
10"
34%
49%
100%
12"
49%
65%
100%
14"
65%
94%
100%
16"
86%
100%
100%
18"
100%
100%
Damper
Damper
Damper
1200
CFM
Diameter
Diameter
Diameter
7%
4"
4%
5%
16%
6"
8%
11%
21%
7"
11%
15%
28%
8"
14%
20%
36%
9"
18%
25%
45%
10"
23%
33%
12"
43%
64%
33%
87%
14"
43%
63%
16"
81%
100%
58%
100%
18"
75%
100%
Damper
Damper
Damper
1600
Diameter
Diameter
Diameter
CFM
CFM
5%
4"
3%
4%
12%
6"
6%
8%
15%
7"
8%
11%
21%
8"
11%
15%
26%
9"
14%
19%
33%
10"
17%
24%
47%
12"
25%
33%
64%
14"
33%
47%
83%
16"
43%
61%
100%
18"
56%
78%
Damper
Damper
Damper
2200
cfm
cfm
Diameter
Diameter
Diameter
4%
4"
2%
3%
9%
6"
4%
6%
12%
7"
6%
8%
16%
8"
8%
11%
20%
9"
10%
14%
25%
10"
12%
18%
35%
12"
18%
24%
48%
14"
24%
34%
63%
16"
31%
44%
80%
18"
41%
57%
10%
22%
29%
39%
49%
61%
88%
100%
100%
100%
7%
15%
19%
26%
33%
41%
58%
80%
100%
100%
5%
11%
14%
19%
25%
31%
44%
60%
78%
100%
4%
8%
10%
14%
18%
22%
32%
43%
57%
73%
18-HD66D1-4
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