Fume extraction hoods and cabinets benchvent bv930h d this fume filtration hood of 710msup3hr air volume capacity is intended for use where external venting is required the attached flexi duct vents to atmosphere either through a standard domestic vent or a convenient window filtration is carried out by a 3 stage graduated fibre filter with a high dust holding capacity that ensures a long filter life this dual process of filtration and extraction means that operators and environments a