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$18.00$35.00
Performance Rating of Variable Frequency Drives (AHRI)..
$10.00 $20.00
Guidelines for Roof Mounted Outdoor Air-Conditioner Installations (AHRI)..
$13.00 $25.00
Performance Rating of Air-To-Air Heat Exchangers for Energy Recovery Ventilation Heat Equipment..
$15.00 $30.00
Self-Contained, Mechanically Refrigerated Drinking-Water Coolers..