Prohibition on air admittance valves repealed.

HF 437 repeals a Minnesota law that prohibited the use of air admittance valves (AAVs) in plumbing venting systems. AAVs are small mechanical devices that allow air into drain pipes without requiring traditional roof vents. The bill removes this restriction from the state's plumbing code, permitting plumbers and builders to use AAVs in new construction and renovations. This is a technical code change affecting plumbing standards, not a broader policy shift.