... Hoods Cleanliness: Class100 Long service life Low noise Model: horizontal airflow hoods Horizontal Laminar Airflow HoodsCommonly used in electronics, precision instruments for ... cleanliness.Features:1. Cleanliness: Class100, conformed to International standard;2. Horizontal and open type, easy operation;3. Adopting changeable airflow control ... . of people 1 1-2 2-3 3-4 Horizontal Laminar Airflow Hoods