Q Chem is a chemical manufacturing facility in Doha Qatar. Due to the nature of the facility and the materials being manufactured there, Ventilux had to supply all IP65 Rated fittings. That is why Ventilux offered their WTL fittings in 20 & 55 watt and also their Vision and WP fittings. All of which are IP67. Rated 6 for dust 7 for liquid/vapour.