Get top performance without breaking the bank with the RELIABILT 105 Series single hung window. This cost-effective option features a side-loaded bottom sash for easy removal and dual lift rails for smooth operation. Ideal for both new construction and remodeling projects, this window comes with an integrated nail fin and built-in accessory channels for versatile installation (nailing fin not included in Series 3050). With a DP-50 rating and modular sizing, it's easy to calculate rough opening widths for multiple units. Enjoy energy efficiency with Low-E glass and Argon insulating gas, while also considering each window's specific U-Value and SHGC value for accurate ENERGY STAR qualifications (may not be applicable in all zones).