Home UL UL Subject 1812 UL Subject 1812$172.00 Original price was: $172.00.$86.00Current price is: $86.00. Standard for Ducted Heat Recovery Ventilators (CSDS Proposal, 4/21/2017) Underwriters Laboratories , 04/21/2017 UL Subject 1812 quantity Add to cart Category: UL Guaranteed Safe Checkout Description Standard By:Underwriters Laboratories , 04/21/2017 Published:04/21/2017 Related products UL Subject 6500 $245.00 Original price was: $245.00.$122.00Current price is: $122.00. Add to cart UL Subject 814 $218.00 Original price was: $218.00.$109.00Current price is: $109.00. Add to cart UL Subject 181B $197.00 Original price was: $197.00.$98.00Current price is: $98.00. Add to cart UL Subject 252 $252.00 Original price was: $252.00.$126.00Current price is: $126.00. Add to cart UL Subject 2250 $143.00 Original price was: $143.00.$71.00Current price is: $71.00. Add to cart