The Slatevent Grey Roof Ventilator is manufactured from rigid PVC. 

It is suitable for 600mm x 300mm (24" x 12") and 500mm x 250mm (20" x 10") double lap slates, man made or natural, for roofs with a pitch over 20°.

The slatevent grey is supplied with adaptors to fit the system 100, 125 and 150 range

suitable for soil ventilation or mechanical extra