https://zenwriting.net/lookzip....per2/installing-a-ca
This double-flap, insulated cat flap provides excellent protection in all climates. It can be installed in wood, uPVC and glass doors. A tightly sealing door is vital, especially in colder weather. It stops warm air from being sucked out and cold air from entering and causing energy costs. Wind Resistance By preventing cold air entering your home and allowing warm air in the cat flap, it will keep it warmer. Most of the best options are insulated and have a magnetic seal that stops the draughts. They also come
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