Don't let this story of night time chicken predation happen to you. Use an automatic chicken door.
What is the purpose of the sealing washer when using the Add A Motor D20 for an automatic chicken coop door? Includes a picture.
A review of the book Poultry House Construction based on my experience building the Ten Hen House. Recommended for building a DIY chicken coop.
This post answers two questions. What size should a chicken door be? What is the range of dimensions appropriate for a chicken pop hole door?