Purair®ADVANCED Ductless Fume Hood, 49" / 1244mm Nominal Width, MONITAIR Controller, Comprising of a P20-HEAD-G-MONP, P20-XT-ENCL, TRAY-P20, (DWYER Airflow Meter Delete), Standard Depth, 230V 50Hz, UK Cord set (unless specified). Requires Minimum Two ASTM-XXX Main Filters and Two Optional ASTS-XXX Safety Filters