Efficient airtight seal: Designed for precise seam fit with an adjustable frame, these side panels provide a reliable airtight seal to prevent air leaks and maximize energy savings in all seasons. Air-supported dust protection: Blocks pollen and dust effectively while resisting wind and noise, improving indoor air quality with quality insulation material. Easy to install: Pre-installed side panels enable fast, simple window mounting without extra tools or complicated procedures, saving valuable installation time. AC expansion-reduction technology: Reduces the load on the air conditioner through intelligent design, protecting against cold drafts in winter and against excessive heat in warmer months, improving overall efficiency. Key attributes - Function: airtight sealing, dust protection, easy installation, and HVAC load reduction. - Compatibility: designed for standard window frames with an adjustable frame. - Materials: uses insulation material to enhance performance. - Performance: helps reduce energy loss, blocks pollen and dust, and improves indoor comfort year-round. Use scenarios - Home energy retrofit: install on existing windows to minimize drafts, reduce energy costs, and improve comfort across seasons. - Office or rental spaces: quick, tool-free installation for apartments, offices, or vacation properties needing dependable sealing and air quality improvements. - Seasonal transitions: effective in winter to stop cold drafts and in summer to prevent excessive heat, supporting more efficient climate control.