U.S. Air-Conditioning, Heating, and Refrigeration Institute (US-AHRI)
Scope
This guideline pertains to fouling factor
allowances as appiied to cenhifugai and rotary screw water
chilling packages/positive displacement compresor water
chiilhg packages as well as absorption water chiiiing and
water heating packages, covered by ARJ Standards 550/590
and 560 respectively.