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ASHRAE 84   2024   Method of Testing Air-to-Air Heat Exchangers 50 $
ASHRAE 84   2020   Method of Testing Air-to-Air Heat Exchangers 50 $
ASHRAE 84   2013   Method of Testing Air-to-Air Heat/Energy Exchangers 50 $
ASHRAE 84   2008   Method of Testing Air-to-Air Heat Exchangers 30 $
ASHRAE 84   1991   Method of Testing Air-to-Air Heat Exchangers 20 $