Understanding AHRI 920 and ISMRE Ratings for the Most Efficient DOAS Specification
Dedicated outdoor air systems (DOAS) have become a staple of HVAC specification over the last 20 years. However, the absence of a test standard, certification program and an efficiency rating target makes it near impossible for engineers and contractors to compare brands, models and features. AHRI’s forthcoming standard 920-2018 will continue the process for certified DOAS testing and establish a clearer definition of efficiency ratings.
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