https://securityholes.science/....wiki/Cat_Flap_Instal
It is best to employ an expert to install a cat flap inside your home. DIY projects typically result in a poorly-fitted pet flap, which can let in drafts and cause more energy costs. SheffLOCK is able to put a cat flap on all kinds of doors, such as wood, glass, uPVC composite and even exterior walls. It takes about 2 hours to put in the new cat flap. Cost of pet flap A pet flap is a great way to let your cat come and go at will. If the flap isn't properly installed, it could allow heat escape from your home and also allo