Cleatech's Polypropylene laboratory fume hoods with durable and chemical resistant construction are turnkey ventilation system designed for applications require exterior ducting for exhaust. These chemical fume hoods are bottom less that can be placed over the standard size worktables. Permanent bottom/ worksurface can be added upon the request. These laboratory exhaust hoods can be equipped with fan module, are great choice for chemical processing that requires the removal of potentially hazardous fumes.