A double hung window screen is a screen designed to fit into a double hung window. Double hung windows have two sashes, one above the other, that slide up and down within the window frame. RiteScreen Custom Extruded Window Screens are engineered to fit size 24.875 in. x 22.25 in. and are designed to keep insects and other pests out of the home while still allowing fresh air to flow into the room. Some features and benefits of a double hung window screen include: Protection from insects and pests, improved air circulation, energy savings, easy installation, and customization. Overall, a double hung window screen is a practical and convenient addition to any home that can help to improve indoor air quality, reduce energy costs, and keep bugs out of the home.AllergyGuardCoated in proprietary three-layer nanotechnology to filter most allergens, including pollen and fine dust, and deliver the most comprehensive insect screen yet.