Ergovent Kvadro Ventilation Diffuser 100 125mm Sizes Available Connection Size:125mm Nominal duct diameter 125 mm Nominal duct diameter 125 mm Operating height 470 mm With roof flashing Yes With pre mounted seal No Surface treatment cap Coated Vertical exhausting Yes Material of cap Steel Connection Duct end Lead flashing on all sides Yes Lamella model No Colour cap Black With storm collar No Suitable for suction Yes With gauze No Cover outer diameter 215 mm Material roof flashing Other Free passage 0 providing a convenient hook for hanging and a strong magnetic attachment for easy placement on metal surfaces Ergovent's innovative and discreet ventilation diffusers are designed to be installed in plasterboard ceilings so as they can be seamlessly plastered in and painted in with their surroundings Convex shape on rear of insert to reduce air vortices