| Model: | GD27 / GD28 |
| Filter: | GD27,GD28 |
| Minimum Panel Size: | 8" x 7" Parallel (GD27)
8" x 14" Opposed (GD28) |
| Maximum Panel Size: | 48" x 72" |
| Frame Depth: | 5 ½" |
| Frame Type: | Hat Channel Shaped |
| Frame Material: | 16 ga. Galvanized Steel |
| Blade Type: | Airfoil Blade Design |
| Blade Material: | 16 ga. Galvanized Steel |
| Blade Action: | Parallel or Opposed |
| Blade Seals: | None |
| Jamb Seals: | None |
| Stops: | Galvanized Steel at Head and Sill |
| Bearings: | Heavy Duty Molded Nylon |
| Axles: | Plated Steel Stub |
| Linkage: | Plated Steel Tie Bar and Crank Plates; Stainless Steel Pivots |
| Actuator: | ½" Extended Shaft, Manual Quadrants
120V, 24V, or 230V Electric or Pneumatic |
| Finish: | Mill |
| Temperature: | 150° F |
| Max Differential Pressure: | 4 in. w.g. |
| Max Velocity: | 2000fpm |
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