Larson 36 in. x 39 in. 2-Track Single Hung Aluminum Storm Window

Low-E glass reduces harmful UV rays that cause fading. Meets ENERGY STAR certification requirements in northern and north-central climate zones. Adding an insulating layer reduces drafts up to 40% by mounting over existing window to create a thermal barrier. Weatherstrip blocks drafts and reduces air infiltration. Bottom expander adjusts for a tight fit. Half screen included for easy ventilation. Glass and screen are removable for easy cleaning. The Attachment Energy Rating Council certifies this product’s energy performance and rates as 69 out of a possible 110 in a dominantly cool climate and 24 out of a possible 55 in a dominantly warm climate.