Wausau, Wis.-based Wausau Window and Wall Systems has announced that its 2250 series windows have earned certification by the National Fenestration Rating Council (NFRC) for energy performance. The windows are listed in the NFRC Product Directory in the categories of casement, fixed and projected windows. Wausau says the series also meets commercial building criteria for the Pacific Northwest region.

According to Wausau, the 2250 series is a line of pre-engineered, aluminum windows that feature thermal breaks for increased performance.