https://trade-britanica.trade/....wiki/Cat_Flap_Instal
A professional cat flap fitter will set up your pet's door into a door, or in a wall. This is more secure since burglars cannot get through it. It also helps to prevent drafts and lowers your energy bills. The Tasker will mark where the cat flap should be inside your door, and then cut the corners. They will also sand the edges of the frame to give it a smooth finish. Microchip cat flaps A microchip cat door is an easy and effective way to keep your pet inside your home. It detects the unique identification microchip that is