- SD - Single deflection
A single bank of individually adjustable blades, held in place by high tensile spring wire.
- DD - Double deflection
Two banks of individually adjustable blades set perpendicularly to each other, held in place with high tensile spring wire.
- FB - Fixed blade
A single bank of fixed blades, set at either 0°, 15° or 45°.
All series are manufactured from the same aluminium extrusions for a consistent appearance across the range.
Options include hinged and removable cores, rear mounted opposed blade dampers for airflow balancing, and polyester powder coating to any RAL/BS colour.