A Perchloric acid hood and other acid digestion hoods are specifically designed to withstand the corrosive nature of acid digestion fumes. The Labconco hoods have an integral work surface and seamless interiors for easy clean up. Interiors can be unplasticized PVC or type 316 stainless steel. The Perchloric acid hood has a wash down system installed to prevent the accumulation of Perchloric acid salts which can be highly reactive. As the interior of the hood is seamless they re fitted with electrical receptacles and fluorescent lighting installed. Special blowers are required for acid digestion hoods, they are constructed of unplasticized PVC. Wash down rings are available for Perchloric acid hood ductwork. The washdown rings are equipped with wide angle spray nozzles and connection fittings of PVC for water washing of the ductwork to prevent the accumulation of Perchloric acid salts. These specialty hoods are available in 4, 5, 6, and 8 foot widths.