This refers to the size of the pop door.
Sliding chicken pop door.
Larger birds may not be able to squeeze through smaller holes.
The cord pulls the door up or lowers it.
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A chicken activated coop door you can also make a diy automatic chicken coop door and instead of using electricity or batteries use the chickens themselves.
The idea is to use the combined weight of the chickens as they climb onto the roosting bar to sleep at night to pull the cables and pulleys and pop the door open.
The height of the chicken coop door from the ground outside doesn t matter as long as chickens have a ramp to access doors that are 18 24 inches high.
What size door do you need.
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Measures approximately 40 1 2 inches tall x 13 7 8 inches wide x 3 7 8 inches deep.
Using the provided screws connect the door opener to your chicken coop link the door opener cord to your chicken coop and you are done.
When the door is closed it sits behind the board on the bottom to thwart raccoons and other small predators.
The door slides along a channel made by screwing a 1x4 on each side of the door then attaching another piece of 1x4 that s offset one inch from the first piece.
Some units come in one standard size 12 x 15.
Ideally it should also have a small lip in front of the positive stop to prevent predators from sliding open the coop door.