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Council approves humidification controls with higher humidity allowance for some climate zones
Summary
Building Code Council approved a revised humidification control proposal that keeps adiabatic humidification as the preferred method, allows steam with enthalpy recovery, and raises the upper relative-humidity threshold for certain climate zones after a floor debate about health and efficiency.
The Building Code Council on March 21 approved a revised humidification and dehumidification proposal that adopts new equipment and control guidance while setting different humidity thresholds by climate zone.
The council’s action approves the proposal as modified to allow up to 67 percent of some existing fossil/electric systems to remain in limited circumstances and — crucially for humidification — sets higher permissible indoor relative-humidity limits for warmer climate zones. Proponents and opponents argued over whether limiting humidification above a 30…
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