The Scienceware® Observation Fume Hood adds extra protection in the classroom for both student and teacher. This safety fume hood is cost-effective for meeting school budgets as well as portable and can be used on a cart for students who need to work from a seated position. The polyethylene surface is chemically resistant and easy to clean. Clear polycarbonate windows allow excellent visualization for a group and will not shatter like acrylic windows. Windows wipe clean with a damp cloth. The front of the hood opens to three adjustable positions for air flow control. The exhaust duct is stepped for use with either a 4" or 6" pipe. An exhaust system capable of drawing 200 cfm (free air) is recommended. Overall dimensions are 27" x 13" x 22". Back, stationary window is 20"W x 11"H. Ship weight is 40 lbs.