|  DRF-OV 250 Maximum capacity - 800 m3/h. |  DRFI-OV 250 Maximum capacity - 800 m3/h. |  DRF-OV 300 Maximum capacity - 1340 m3/h. |  DRFI-OV 300 Maximum capacity - 1340 m3/h. |  DRF-OV 350 Maximum capacity - 2500 m3/h. |
| Phase, [˜] | 1 | 1 | 1 | 1 | 1 |
| Voltage, [V] | 230 | 230 | 230 | 230 | 230 |
| Frequency , [Hz] | 50 | 50 | 50 | 50 | 50 |
| Current, [A] | 0.22 | 0.22 | 0.35 | 0.35 | 0.65 |
| Power consumption, [W] | 50 | 50 | 75 | 75 | 140 |
| Maximum air capacity , [m³/h] | 800 | 800 | 1340 | 1340 | 2500 |
| RPM, [min -1] | 1380 | 1380 | 1350 | 1350 | 1380 |
| Noise level at 3 m, [[dBA]] | 53 | 46 | 56 | 49 | 60 |
| Maximum transported air temperature, [оC] | 60 | 60 | 60 | 60 | 60 |
| Protection rating, [class] | IP X4 | IP X4 | IP X4 | IP X4 | IP X4 |
| Weight, [kg] | 6 | 11 | 7.2 | 14.5 | 9.7 |
| Range of air stream, [m] | 6-9 | 6-9 | 8-11 | 8-11 | 10-13 |
| Influence area, [m²] | 28-64 | 28-64 | 50-95 | 50-95 | 78-133 |
| Sound- and heat-insulated casing | no | yes | no | yes | no |
|  DRFI-OV 350 Maximum capacity - 2500 m3/h. |
| Phase, [˜] | 1 |
| Voltage, [V] | 230 |
| Frequency , [Hz] | 50 |
| Current, [A] | 0.65 |
| Power consumption, [W] | 140 |
| Maximum air capacity , [m³/h] | 2500 |
| RPM, [min -1] | 1380 |
| Noise level at 3 m, [[dBA]] | 53 |
| Maximum transported air temperature, [оC] | 60 |
| Protection rating, [class] | IP X4 |
| Weight, [kg] | 17 |
| Range of air stream, [m] | 10-13 |
| Influence area, [m²] | 78-133 |
| Sound- and heat-insulated casing | yes |