Discussion during this morning’s U-factor Subcommittee session included reviewing a motion aimed at simplifying adherence to NFRC’s ratings for pre-hung doors.

One of the changes balloted by the Door Task Group to ANSI/NFRC 100, Procedure for Determining Fenestration Products U-Factors, called for adding an optional rating method for side-hinged exterior doors referenced as the “Simplified Door Rating Method” (SDR). 

In this method doorglass assemblies and door slabs are modeled separately, providing a door pre-hanger with simplified process for acquiring a rating for exterior door systems that use doorglass assemblies from one supplier and a door slab from another.    

Members voted to send the document back to the task group, asking them to publish the findings that verify the procedure.