TEC - Ring C for Model 3 FanRing C is used with the Model 3 Minneapolis Blower Door system to measure fan flows between 300 and 85 cfm, and between 260 and 50 cfm with the Model 4 system . Flows in this range are typically measured in tightly constructed new houses, or in airtight rooms (e. g. computer rooms). Product Number: RINGC
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