1.explain 5 features that makes a suitable location for measuring duct velocity in a local ventilation system

2. discuss 4 suitability each of these locations when measuring duct velocity

a. a duct system their the hood with 3meters long and 1.5 meters from the floor level

b. a duct location which is 5 meters long from the air cleaner and 3 meters above the floor level

c. a duct location which is 3meters long from the air cleaner and 3meters long from the floor level