When the air volume you're measuring is too low for a standard range balometer to read accurately, try the TSI Alnor LoFlo air capture hoods. The TSI Alnor 6200 measures supply and return air flows from 10 to 500 CFM. Even with the 2-foot-square hood attached, the light-weight (6.5 lb) 6200 is compact, at a total hight of only 35", so it'll fit in tight spaces easily. The simulated analog display shows air trends and digital readings.
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