Specifications
| Model Number | Propeller Diameter | CFM | Motor RPM | Motor HP | Full Load Amps | Bearing Type | Speed Control | No. of Shutter Blades |
| GSF3-10A | 10" | 600 | 1520 | 1/25 | 0.56 | Sleeve | 3 | 3 |
| GSF3-12A | 12" | 772 | 1610 | 1/20 | 0.6 | Sleeve | 3 | 3 |
| GSF3-16A | 16" | 1200 | 1580 | 1/20 | 0.83 | Ball | 3 | 4 |
| GSF3-18A | 18" | 1736 | 1070 | 1/15 | 0.9 | Ball | 3 | 5 |
| GSF3-20A | 20" | 3368 | 1075 | 1/4 | 2.59 | Ball | 3 | 5 |
| GSF3-24A | 24" | 4244 | 1050 | 1/4 | 2.65 | Ball | 3 | 6 |
| Two Speed | ||||||||
| GSF2-30B | 30" | 5088 | 825 | 1/3 | 3.1 | Ball | 2 | 8 |