Engineering Bulletin
Engineering Data
Engineering Data
120
821, 831, 92 Series and 98VOH (Page 36-38, 41)
Deflection A
Deflection C
Terminal Velocity of 75 fpm
* less than or equal to ** greater than or equal to
Face Velocity 400 500 600 700 800 900 1000 1100 1200 1300 1400 1600 1800 2000
Pressure Loss .010 .016 .022 .031 .040 .050 .062 .075 .090 .105 .122 .160 .202 .249
8x4
Ak .160
cfm
Throw
65
6.5
80
8
100
10
110
11
130
13
145
15
160
16
175
18
190
19
210
21
225
23
255
26
290
29
320
32
10x4
Ak .202
cfm
Throw
80
7
100
9
120
11
140
13
160
14
180
16
200
18
220
20
240
22
265
24
285
26
325
29
365
33
405
36
12x4
Ak .244
cfm
Throw
100
8
120
10
145
12
170
14
195
16
220
18
245
20
270
22
295
24
315
26
340
28
390
32
440
36
490
40
14x4
Ak .286
cfm
Throw
115
8.5
145
11
170
13
200
15
230
17
255
19
285
22
315
24
345
26
370
28
400
30
460
35
515
39
570
43
12x5
Ak .312
cfm
Throw
125
9
155
11
190
14
220
16
250
18
280
20
310
22
345
25
375
27
405
29
435
31
500
36
560
41
625
45
10x6
Ak .314
cfm
Throw
125
9
155
11
190
14
220
16
250
18
285
21
315
23
345
25
375
27
410
30
440
32
500
36
565
41
630
45
14x5
Ak .366
cfm
Throw
145
10
185
12
220
15
255
17
295
20
330
22
365
24
405
27
440
29
475
32
510
34
585
39
660
44
730
49
12x6
Ak .379
cfm
Throw
150
10
190
12
225
15
265
17
305
20
340
22
380
25
415
27
455
30
495
33
530
35
605
40
680
45
760
50
16x5
Ak .419
cfm
Throw
170
11
210
13
250
16
295
18
335
21
380
24
420
26
460
29
505
32
545
34
585
37
670
42
755
47
840
53
14x6
Ak .444
cfm
Throw
180
11
220
13
265
16
310
19
355
22
400
24
445
27
490
30
535
32
575
35
620
38
710
43
800
49
890
54
16x6
Ak .510
cfm
Throw
205
12
255
15
305
17
355
20
410
23
460
26
510
29
560
32
610
35
665
38
715
41
815
47
920
53
1020
58
20x5
Ak .526
cfm
Throw
210
12
265
15
315
18
370
21
420
23
475
27
525
29
580
32
630
35
685
38
735
41
840
47
945
53
1050
59
24x5
Ak .634
cfm
Throw
255
13
315
16
380
19
445
23
505
26
570
29
635
32
695
35
760
39
825
42
890
45
1015
52
1140
58
1270
65
20x6
Ak .640
cfm
Throw
255
13
320
16
385
19
445
23
510
26
575
29
640
32
705
36
770
39
830
42
895
45
1015
52
1140
58
1270
65
24x6
Ak .771
cfm
Throw
310
14
385
18
465
21
540
25
615
28
695
32
770
35
850
39
925
43
1000
46
1080
50
1235
57
1390
64
1540
71
20x8
Ak .868
cfm
Throw
345
15
435
19
520
23
610
26
695
30
780
34
870
38
955
41
1040
45
1130
49
1215
53
1390
60
1560
68
1735
75
30x6
Ak .967
cfm
Throw
385
16
485
20
580
24
675
28
775
32
870
36
965
40
1065
44
1160
48
1255
51
1355
56
1545
63
1740
71
1935
79
24x8
Ak 1.045
cfm
Throw
420
17
525
21
625
25
730
29
835
33
940
37
1045
41
1150
46
1255
50
1360
54
1465
58
1670
66
1880
74
2090
83
30x8
Ak 1.310
cfm
Throw
525
19
655
23
785
28
915
32
1050
37
1180
42
1310
46
1440
51
1570
56
1705
60
1835
65
2095
74
2360
84
2620
93
24x10
Ak 1.319
cfm
Throw
530
19
660
23
790
28
925
33
1055
37
1185
42
1320
46
1450
51
1585
56
1715
60
1845
65
2110
74
2375
84
2640
93
36x8
Ak 1.576
cfm
Throw
630
20
790
25
945
30
1105
36
1260
41
1420
46
1575
51
1735
56
1890
61
2050
66
2205
71
2520
81
2835
91
3150
101
24x12
Ak 1.593
cfm
Throw
635
20
795
25
995
31
1115
36
1275
41
1435
47
1595
51
1750
56
1910
61
2070
66
2230
71
2550
82
2865
92
3185
102
30x10
Ak 1.654
cfm
Throw
660
21
825
26
990
31
1160
37
1325
42
1490
47
1655
52
1820
57
1985
63
2150
68
2315
73
2645
83
2975
94
3310
104
36x10
Ak 1.989
cfm
Throw
795
23
995
29
1195
34
1390
40
1590
46
1790
51
1990
57
2190
63
2385
68
2585
74
2785
80
3180
91
3580
103
3980
114
30x12
Ak 1.997
cfm
Throw
800
23
1000
29
1200
34
1400
40
1600
45
1800
51
2000
57
2200
63
2395
68
2595
74
2795
80
3195
91
3595
103
3995
114
36x12
Ak 2.402
cfm
Throw
960
25
1200
31
1440
38
1680
44
1920
50
2160
56
2400
63
2640
69
2880
75
3120
81
3365
88
3845
100
4325
113
4805
125
*NC 30 NC 35 NC 40 **NC 45
Terminal Velocity of 75 fpm
Face Velocity 400 500 600 700 800 900 1000 1100 1200 1300 1400 1600 1800 2000
Pressure Loss .010 .016 .022 .031 .040 .050 .062 .075 .090 .105 .122 .160 .202 .249
8x4
Ak .140
cfm
Throw
55
5
70
6
85
7.5
100
8.5
110
9.5
125
11
140
12
155
14
170
15
180
16
195
17
225
20
250
22
280
24
10x4
Ak .178
cfm
Throw
70
5
90
7
105
8
125
9.5
140
11
160
12
180
14
195
15
215
17
230
18
250
19
285
22
320
25
355
28
12x4
Ak .215
cfm
Throw
85
6
110
8
130
9
150
11
170
12
195
14
215
15
235
17
260
18
280
20
300
21
345
24
385
27
430
30
14x4
Ak .252
cfm
Throw
100
6.5
125
8
150
10
175
11
200
13
225
15
250
16
275
18
300
20
330
22
355
23
405
26
455
30
505
33
12x5
Ak .274
cfm
Throw
110
7
135
8.5
165
10
190
12
220
14
245
15
275
17
300
19
330
21
355
22
385
24
440
28
495
31
550
34
10x6
Ak .276
cfm
Throw
110
7
140
8.5
165
10
195
12
220
14
245
15
275
17
305
19
330
21
360
22
385
24
440
27
495
31
550
34
14x5
Ak .321
cfm
Throw
130
7.5
160
9
195
11
225
13
255
15
290
17
320
18
355
21
385
22
415
24
450
26
515
30
580
34
645
37
12x6
Ak .333
cfm
Throw
135
7.5
165
9.5
200
11
235
13
265
15
300
17
335
19
365
21
400
23
435
25
465
26
535
30
600
34
665
38
16x5
Ak .369
cfm
Throw
150
8
185
10
220
12
260
14
295
16
330
18
370
20
405
22
445
24
480
26
515
28
590
32
665
36
740
40
14x6
Ak .391
cfm
Throw
155
8
195
10
235
12
275
14
315
17
350
18
390
20
430
23
470
25
510
27
545
29
625
33
705
37
780
41
16x6
Ak .448
cfm
Throw
180
9
225
11
270
13
315
15
360
18
405
20
450
22
495
24
540
26
580
28
625
31
715
35
805
39
895
44
20x5
Ak .463
cfm
Throw
185
9
230
11
280
13
325
16
370
18
415
20
465
22
510
25
555
27
600
29
650
31
740
36
835
40
925
44
24x5
Ak .557
cfm
Throw
225
10
280
12
335
15
390
17
445
19
500
22
555
24
615
27
670
29
725
32
780
34
890
40
1005
44
1115
49
20x6
Ak .563
cfm
Throw
225
10
280
12
340
15
395
17
450
20
505
22
565
25
620
27
675
29
730
32
790
34
900
39
1015
44
1125
49
24x6
Ak .678
cfm
Throw
270
11
340
14
405
16
475
19
540
21
610
24
680
27
745
30
815
32
880
35
950
38
1085
43
1220
49
1355
54
20x8
Ak .763
cfm
Throw
305
11
380
14
460
17
535
20
610
23
685
26
765
29
840
32
915
34
990
37
1070
40
1220
46
1375
52
1525
57
30x6
Ak .850
cfm
Throw
340
12
425
15
510
18
595
21
680
24
765
27
850
30
935
33
1020
36
1105
39
1190
42
1360
48
1530
54 1700
24x8
Ak .919
cfm
Throw
370
13
460
16
550
19
645
22
735
25
825
28
920
31
1010
35
1105
38
1195
41
1285
44
1470
50
1655
57
1840
63
30x8
Ak 1.152
cfm
Throw
460
14
575
15
690
21
805
25
920
28
1035
32
1150
35
1265
39
1380
42
1500
46
1615
49
1845
56
2075
63
2305
70
24x10
Ak 1.160
cfm
Throw
465
14
580
18
695
21
810
25
930
28
1045
32
1160
35
1275
39
1390
42
1510
46
1625
49
1855
56
2090
64
2320
71
36x8
Ak 1.386
cfm
Throw
555
15
695
19
830
19
970
27
1110
31
1245
35
1385
39
1525
42
1665
46
1800
50
1940
54
2220
62
2495
69
2770
77
24x12
Ak 1.401
cfm
Throw
560
16
700
19
840
23
980
27
1120
31
1260
35
1400
39
1540
43
1680
47
1820
50
1960
54
2240
62
2520
70
2800
78
30x10
Ak 1.454
cfm
Throw
580
16
725
20
870
24
1020
28
1165
32
1310
36
1455
39
1600
43
1745
47
1890
51
2035
55
2325
63
2615
71
2910
79
36x10
Ak 1.749
cfm
Throw
700
17
875
22
1050
26
1225
30
1400
35
1575
39
1750
43
1925
48
2100
52
2275
56
2450
61
2800
69
3150
78
3500
87
30x12
Ak 1.756
cfm
Throw
700
17
880
22
1055
26
1230
30
1405
35
1580
39
1755
43
1930
48
2110
52
2285
56
2460
61
2810
69
3160
78
3510
87
36x12
Ak 2.112
cfm
Throw
845
19
1055
24
1265
28
1480
33
1690
38
1990
43
2110
47
2325
52
2535
57
2745
62
2955
66
3380
76
3800
86
4225
95
See Alternate Sizing Graph on Page 160.
See Deflections on Page 158.