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Simplifying Door Ratings Figures Prominently in Morning Session

Posted By Tom Herron, National Fenestration Rating Council, Tuesday, March 24, 2015

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.

The motion passed by unanimous voice vote.

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