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 224 $284.00 Original price was: $284.00.$142.00Current price is: $142.00. Add to cart UL 875 $161.00 Original price was: $161.00.$80.00Current price is: $80.00. Add to cart UL 507 $254.00 Original price was: $254.00.$127.00Current price is: $127.00. Add to cart UL Subject 1063 $229.00 Original price was: $229.00.$114.00Current price is: $114.00. Add to cart UL 2127 $148.00 Original price was: $148.00.$74.00Current price is: $74.00. Add to cart