| Unit | SR-36 | SR-38 | SR52H |
| Motor | 5.7" 2 Stage Flow Thru |
5.7" Ultra 2 Stage Flow Thru |
7.2" 2 Stage Tangential By-Pass |
| Voltage | 120 A.C. | 120 A.C. | 120 A.C. |
| Max Amps | 11.3 | 15.0 | 15.8 |
| Max Air Watts | 561 | 725 | 631 |
| Airflow CFM | 117 | 133 | 121 |
| Sealed Vacuum "H2O |
142 | 145 | 142 |
| Filtration | Sealed Paper Bag | Sealed Paper Bag | Multi-Layer Hepa Bag |
| Sound Level | 58 db | 58 db | 70 db |
| Capacity | 25 Qt. | 25 Qt. | 27 Qt. |
| Dimensions Power Unit | Dia. 12 7/8 Ht. 25 3/4 | Dia. 12 7/8 Ht. 25 3/4 | Dia. 12 7/8 Ht. 25 3/4 |
| * # of Valves | 2-5 | 5-8 | 6-10 |
| * Max Pipe Run | 125 ft. | 140 ft. | 160 ft. |
| * Up to Total Sq. Ft. | 3,000 | 6,000 | 10,000 |