A shelf TM 812 storage enclosure is equipped with a blower and a molecular filter (figure 6) capable to retain the vapours escaping from chemical bottles in use. It offers a large opened front allowing the user to place inside easily the bottles during the day. The blower (extremely silent, only 45 dbA), takes the air of the room to the storage enclosure. The induced air flow carries along the  chemical vapors to the molecular filter where they are safely eliminated (filtration according to class 2 of the NFX 15-211). After filtration, the purified air returns into the room. A shelf TM 812 can be installed immediately at any workstation and just needs to be connected to a standard electrical socket to be in service. It can be either installed directly on the bench top, or on leg supports or fixed to the wall.