Structure made of 19mm thick ply board covered with sun mica from outside. Work Bench of perforated Stainless steel. Sides of work bench covered with transparent acrylic sheet. Front acrylic door of collapsible type. Properly balanced blowers fitted on ¼ H.P. electric motor portion to supply sufficient air to HEPA Filter provided on the top of the work bench horizontally to supply clean air to the work bench vertically. Pre-filters provided on the top to supply pre- filtered air to the blowers.