Ventilation grids can be used independently, connected with fans with adjusted sizes and applied in ventilation kits: grid + fan/grid. The ventilation grids are available in two basic colours – RAL7035 /light grey/ or RAL7032 /dark grey/.
Below there is a comparison photo of CT-205 /CT-256 grids.
Parametric table of ventilation grids CT-205 / CT-256