EDU-Mobile® Air Science, Classroom Demonstration Hood, Downflow Version, 39" / 1000mm Width, FSA Filter Saturation Alarm and AUTOCAL Airflow Display, Includes TRAY-EDU-M-40 Spill Tray, 230V 50Hz, Gas and Water Service fixtures, Polypropylene construction Requires One ASTM-XXX Main Filter and One Optional ASTS-XXX Safety Filter