https://scientific-programs.sc....ience/wiki/Cat_Flap_
Installing a cat flap on your door is a relatively simple task. You will need to be aware of a few issues before you begin. Upvc door panels with an opening for cats can be fitted without having to cut an opening in your wall or door. Many glass manufacturers offer them with holes already made for a pet-door. 1. Safety Cat flaps made of upvc are simple to install and can be installed to many different types of doors. They are energy-efficient and weatherproof and feature draft-proofing built in to aid in insulating the op
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