Vinyl insulated frame and sash

Over the years, manufacturers of vinyl windows started filling the frames and sashes of their products with a couple of kinds of insulation for increased energy performance, and thermal comfort of the end-user. Two different types of insulation are: Neopor used by ProVia windows and EPS – expanded polystyrene used by OKNA windows and doors. Read more at Patio doors CT

OKNA Windows – Model EnviroStar 800 Series Deluxe with EPS Foam Filled Frame and Sash

ProVia Windows – Model Endure with Neopor Filled Frame