Damper Actuator Sizing Chart
One of the most frequent problems that technicians face is how to determine the correct torque actuator for their damper. These tables should help. First determine the size and type damper, then determine the air flow that the damper needs to open and close against. From that point, use the charts below to determine the amount of torque needed.
Damper Type | Up to 1000 fpm | 1000-2500 fpm | 2500-3000 fpm |
---|---|---|---|
Opposed Blades without Seals | 3 in.-lbs./sq.ft. | 4.5 in.-lbs./sq.ft. | 6 in.-lbs./sq.ft. |
Parallel Blades without Seals | 4 in.-lbs./sq.ft. | 6 in.-lbs./sq.ft. | 8 in.-lbs./sq.ft. |
Opposed Blades with Seals | 5 in.-lbs./sq.ft. | 7.5 in.-lbs./sq.ft. | 10 in.-lbs./sq.ft. |
Parallel Blades with Seals | 7 in.-lbs./sq.ft. | 10.5 in.-lbs./sq.ft. | 14 in.-lbs./sq.ft. |
Opposed Blades without Seals | |||
---|---|---|---|
Torque required (in.lbs.) | |||
sq.ft. | <1000 fpm | 1000-2500 fpm | 2500-3000 fpm |
5 | 15 | 23 | 30 |
10 | 30 | 45 | 60 |
15 | 45 | 68 | 90 |
20 | 60 | 90 | 120 |
25 | 75 | 113 | 150 |
30 | 90 | 135 | 180 |
35 | 105 | 158 | 210 |
40 | 120 | 180 | 240 |
Opposed Blades with Seals | |||
---|---|---|---|
Torque required (in.lbs.) | |||
sq.ft. | <1000 fpm | 1000-2500 fpm | 2500-3000 fpm |
5 | 25 | 38 | 50 |
10 | 50 | 75 | 100 |
15 | 75 | 113 | 150 |
20 | 100 | 150 | 200 |
25 | 125 | 188 | 250 |
30 | 150 | 225 | 300 |
35 | 175 | 263 | 350 |
40 | 200 | 300 | 400 |
Parallel Blades without Seals | |||
---|---|---|---|
Torque required (in.lbs.) | |||
sq.ft. | <1000 fpm | 1000-2500 fpm | 2500-3000 fpm |
5 | 20 | 30 | 40 |
10 | 40 | 60 | 80 |
15 | 60 | 90 | 120 |
20 | 80 | 120 | 160 |
25 | 100 | 150 | 200 |
30 | 120 | 180 | 240 |
35 | 140 | 210 | 280 |
40 | 160 | 240 | 320 |
Parallel Blades with Seals | |||
---|---|---|---|
Torque required (in.lbs.) | |||
sq.ft. | <1000 fpm | 1000-2500 fpm | 2500-3000 fpm |
5 | 35 | 53 | 70 |
10 | 70 | 105 | 140 |
15 | 105 | 158 | 210 |
20 | 140 | 210 | 280 |
25 | 175 | 263 | 350 |
30 | 210 | 315 | 420 |
35 | 245 | 368 | 490 |
40 | 280 | 420 | 560 |
If possible, refer to the damper manufacturer’s torque specification, to be sure.