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The IRISS VPFR (Viewing Pane Fixed Re-enforced) range of IR windows use the IR1 & IR2 lens assemblies. These are the first infrared viewing pane lens assemblies to be tested for the impact and flammability requirements of UL standard 746C 6th Edition and 508A, as well as the impact and load requirements of IEEE C.37.20.2 section a.3.6 and pass.
