Coolseal: Keep the fresh air inside. Coolseal prevents hot air from entering your room and keeps it cool. It simply creates a barrier around your open window, sealing with a slider around the exhaust hose of your portable air conditioner, preventing warm air from outside from coming back in, which makes your portable air conditioner's cooling performance more efficient. Coolseal is a universal product and fits all portable air conditioners.

Specification:

• No tools required
• Saves on energy consumption
• Cools your room faster
• Easy to install and remove
• Includes Velcro
• Max. window circumference = 4 meters.