The Rating System does not explicitly prohibit bypass systems; should they be disallowed?\n\nThis CIR is based on a project in Canada with a bypass filtration system with a MERV-18 air filter. According to the project team: "With respect to Rodeo LEED Plantinum Certifications, the HEPA bypass filter works as follows: In continuous fan operation mode the continuous air handler moves aprox. 450 cfm. The Bypass HEPA system operates at 300 cfm. In my 20 years of designing residential mechanical systems, I have never put a HEPA directly into the air stream because it creates too much of a pressure drop. The bypass HEPA has no pressure drop and cleans 100% of the air in the house in less than two passes."\n
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