Ring 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 very tightly constructed new houses, or in airtight rooms (e.g. computer rooms).
Product Number: RINGC
The shipping fee is not included in the price. Please contact Radon West at 403.723.6665 for a shipping quote.