2M/3M Portable Window Seal for AC Exhaust Effective cooling solution: seals window gaps to prevent warm air from reentering and can improve cooling efficiency by up to 30%. Designed for tilting windows, casement windows, and skylights to create a better cooling environment. Easy installation and adjustment: wrap the seal around the open window frame, pull the tension rope around the AC exhaust hose, and secure in place. No tools required. The polyester fabric adapts to irregular window shapes for a reliable airtight seal in minutes. Size, compatibility and limits: available in 2m and 3m lengths to match different gap sizes. Compatible with most standard portable air conditioners, tumble dryers, exhaust dryers, and dehumidifiers. Suitable for hung skylights, pushout casement windows, and inwardopening casement windows. Not suitable for sliding windows or doors. Durable material: polyester that is weatherresistant and stays flexible with extended use. White fabric blends with most interiors while maintaining performance through the cooling season. Practical use scenarios: Living room with a portable AC and a casement window to block outdoor heat. Attic or sunroom where a skylight is vented through the window seal. Laundry/utility area venting a dryer or dehumidifier through a window with minimal leaks.