The effectiveness of laboratory fume hoods, in addition to correct design, is also closely related to reasonable use and maintenance. Therefore, the following points should be noted:
       (1) During the experiment, the experimental device that produces harmful substances should be placed in the fume hood where the operating opening of the cabinet is greater than 150MM to prevent the spillage of harmful substances;
       (2) The experimental device of the fume hood should not block the exhaust slits;
       (3) After the experiment is completed, the fan should not be turned off immediately. It must wait 3 to 5 minutes before turning off;
       (4) The fume hood should not be used as a storage cabinet;
       (5) The inside of the fume hood should always be kept smooth and airtight, and should be cleaned and cleaned regularly and thoroughly. If there is any damage, it must be repaired in time;
       (6) Ventilators, air ducts and related accessories should be inspected regularly.