This product is availiable in the following colours - beige, black, brown, clear, grey, terracotta and white. Properties Airflow: 320mm2 at grill. Type W dimensions: 105mm x 65mm x 9.5mm. Ext duct dimensions: 200/225mm x 65mm x 10mm. Material: polypropelene. ODP: zero. Colour: black. Description The Type W is a dual-function combined weep and ventilator. It is finished with an inclined insect resistant grille that promotes excellent air flow with the accompanying benefit of internal baffles to arrest wind-driven rain entering. The Type W makes use of positive and negative air pressure to aid functionality. It permits the cavity to breathe and evacuate water from lintels, trays and DPCs.