Door Flap Installation
A pet door or pet flap in glass door (also referred to in more specific terms, such as cat flap door, dog door) is a small opening to allow pets to enter and exit from sliding door or main door on their own without needing a human to open the door.
Originally simple holes, the modern new form is a hinged and often spring-loaded panel or flexible flap controlled. They offer a degree as 45 to 90 of protection against wind, rain, and larger-bodied intruders entering the dwelling.
Similar hatches gate door can let dogs flap through fences at stiles. A related flap concept is the pet gate, which is easy for humans to open but acts as a secure pet barrier, as well as the automated left- or right-handed pet doors.