Amount of air leakage through a penetration, measured in cubic feet per minute. The test is administered at ambient and 4000F for validity due to variances in per- formance of firestop systems at different temperatures
William J. McHugh, Jr., Glossary of Firestop Terms (Article, Life Safety Digest magazine), Firestop Contractors International Association FCIA, Hillside, IL, USA 2010. http://www.fcia.org/articles/glossary.htm , (Firestop - Amer) {511}