| 摘要 |
<p>A toxic vapour producing material storage cabinet has a sealingly closable door (12). Air circulation means (31, 39, 44) passes air in the cabinet through a replaceable filter (40) for absorbing the vapour. The air exits the circulating means as an air curtain (65) across an aperture (53) giving access to the cabinet. A pump (39, 44) has two speeds of air circulation, slow when the door (12) is closed and fast when the door (12) is open. Operative components of the pump are replaceable as a unit. </p> |
