Clapboard:


| Common Specifications | ||||
| Model | Dimensions | Rated Air Flow (m3/h) | Face Velocity (m/s) | Initial Pressure Drop (Pa) |
| W×L×D (mm) | ||||
| HWM-20×10×2 | 492×238×46 | 1050 | 2.5 | 15 |
| HWM-20×16×2 | 492×390×46 | 1720 | ||
| HWM-20×20×2 | 492×492×46 | 2170 | ||
| HWM-24×24×2 | 594×594×46 | 3170 | ||
| HWM-25×16×2 | 619×390×46 | 2170 | ||
| HWM-25×20×2 | 619×492×46 | 2740 | ||