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94/94A Series Return Air Grilles & Registers (Page 10)

96AFB Steel Fixed-Bar Filter Grille (Page 10)

Face Velocity 300 400 500 600 700 800 900 1000

6 x 6 CFM 45 60 75 90 105 120 135 150

Ak .150 Ps .010 .019 .029 .046 .060 .075 .100 .130

CFM 84 112 140 169 197 225 253 281

Ps .010 .019 .029 .046 .060 .075 .100 .130

CFM 135 180 225 270 315 360 405 450

Ps .011 .019 .030 .042 .057 .072 .094 .119

CFM 96 127 159 191 223 255 287 318

Ps .011 .019 .029 .045 .059 .074 .099 .128

CFM 112 150 187 225 262 300 337 375

Ps .011 .019 .029 .044 .058 .074 .097 .124

CFM 152 203 254 304 355 406 456 507

Ps .011 .019 .030 .041 .056 .072 .093 .116

CFM 198 264 330 395 461 527 593 659

Ps .011 .019 .030 .039 .054 .070 .089 .109

CFM 267 355 444 533 622 711 800 888

Ps .011 .020 .031 .040 .055 .074 .091 .111

CFM 301 401 502 602 703 803 903 1004

Ps .011 .020 .031 .041 .056 .076 .092 .112

CFM 336 448 560 672 784 895 1007 1119

Ps .011 .020 .031 .041 .056 .078 .093 .114

CFM 406 541 676 811 946 1082 1217 1352

Ps .011 .020 .031 .043 .058 .081 .095 .116

CFM 458 611 764 917 1069 1222 1375 1528

Ps .011 .020 .032 .043 .058 .083 .096 .117

CFM 511 682 852 1023 1193 1364 1534 1704

Ps .011 .020 .032 .044 .059 .084 .097 .118

CFM 571 761 951 1141 1331 1522 1712 1902

Ps .011 .020 .032 .044 .059 .086 .098 .119

CFM 618 824 1030 1236 1442 1649 1855 2061

Ps .011 .020 .032 .045 .060 .087 .099 .120

CFM 690 920 1150 1380 1610 1840 2070 2300

Ps .011 .020 .032 .045 .060 .089 .100 .120

CFM 781 1041 1301

1561 1822 2082 2342 2602

Ps .011 .020 .032 .045 .060 .090 .100 .121

CFM 835 1114 1392 1671 1949 2228 2506 2785

Ps .011 .020 .031 .046 .060 .090 .100 .121

CFM 946 1261 1576 1892 2207 2522 2838 3153

Ps .011 .019 .031 .045 .059 .090 .099 .120

CFM 1057 1410 1762 2115 2467 2820 3172 3525

Ps .011 .019 .030 .045 .058 .089 .098 .119

CFM 1284 1712 2140 2568 2996 3424 3852 4280

Ps .011 .018 .028 .043 .055 .085 .092 .114

CFM 1341 1789 2236 2683 3130 3577 4024 4471

Ps .011 .017 .028 .042 .054 .083 .091 .112

CFM 1633 2177 2721 3265 3810 4354 4898 5442

Ps .010 .015 .024 .037 .047 .070 .079 .100

CFM 1751 2335 2919 3503 4086 4670 5254 5838

Ps .009 .014 .022 .035 .043 .064 .073 .095

CFM 1992 2656 3320 3984 4648 5312 5976 6640

Ps .008 .012 .017 .029 .034 .048 .059 .081

CFM 2742 3656 4570 5484 6398 7312 8226 9140

Ps .008 .012 .017 .029 .034 .048 .059 .081

CFM 3808 5077 6346 7615 8884 10154 11423 12692

Ps .008 .012 .017 .029 .034 .048 .059 .081

10 x 10

Ak .450

12 x 6

Ak .320

14 x 6

Ak .370

14 x 8

Ak .510

8 x 8

Ak .280

24 x 12

Ak 1.350

18 x 18

Ak 1.530

30 x 12

Ak 1.700

20 x 20

Ak 1.900

12 x 12

Ak .660

24 x 8

Ak .890

18 x 12

Ak 1.000

30 x 8

Ak 1.120

36 x 18

Ak 3.150

30 x 24

Ak 3.520

36 x 24

Ak 4.280

30 x 30

Ak 4.470

36 x 12

Ak 2.060

24 x 20

Ak 2.300

30 x 18

Ak 2.600

24 x 24

Ak 2.780

48 x 48

Ak 12.700

For sizes not listed and sizing tips see page(s) 76

36 x 30

Ak 5.440

48 x 24

Ak 5.840

36 x 36

Ak 6.640

48 x 36

Ak 9.140

PFG Perforated Face Grille (Page 11)

Return Air Grille Balancing Data

To Determine CFM:

1. Use an ALNOR Velometer with No. 2220 or 2220A Tip or a 4" rotating vane anemometer. If a 4" rotating vane anemometer is used,

place dial face against perforated plate, and sample in a random manner for at least 1 minute.

2. Select proper Ak from Table by unit size and instrument used for measuring velocity.

3. Determine CFM by the following equation: CFM = Ak x Average Velocity.

Sample Problem

Determine Return Airflow Rate (CFM) through a 10 x 10, using an ALNOR Velometer with Tip No. 2220 or 2220A.

Solution

1. Assume the average of 6 velocity readings taken with an ALNOR Velometer is 2000 FPM.

2. From Table, the Area Factor for a 10 x 10 using an ALNOR Velometer is Ak = .39 sq. ft.

3. CFM = Ak x Average Velocity = .39 sq. ft. x 2000 FPM = 780 CFM

Neck Velocity 200 300 400 500 600 650 700 750 800 900

S.P. Drop w/OBD .012 .027 .049 .078 .110 .130 .150 .170 .190 .240

Size

ALNOR

4" ROT.

Vane

10 x 10 .39 .55 140 210 285 350 415 450 485 520 555 625

12 x12 .46 .79 200 300 400 500 600 650 700 750 800 900

14 x 14 .62 1.07 270 410 545 680 815 885 955 1020 1090 1225

10 x 22 .71 1.21 305 460 610 765 915 995 1070 1150 1220 1375

16 x 16 .82 1.40 355 530 710 890 1065 1155 1245 1335 1425 1600

18 x 18 1.05 1.77 450 675 900 1125 1350 1460 1575 1690 1800 2030

20 x 20 1.28 2.25 555 835 1110 1390 1665 1805 1945 2080 2220 2500

22 x 22 1.55 2.70 670 1010 1345 1680 2020 2180 2350 2520 2690 3020

Air Capacities - CFM

Recommended Noise Criteria and Face Velocity Ranges are on page 75

Engineering Data