The truth is that a range of sizes will work for the chicken door. The door should be at least 8 inches wide and up to 12 inches tall. My recommendation comes from experience building a coop and the book Poultry House Construction.
Pan-fry a T-bone steak quickly over high heat. Heat the pan on the stove top on high, then place the steak in the center of the pan. This sears one side of the steak almost immediately. Turn the steak after 6 to 8 minutes using tongs so you don't puncture the meat and let the juices escape. Let the steak fry for another 6 to 8 minutes.
Put the steak on the grill and sear it for two to three minutes on both sides. Use tongs to turn the meat. A fork pierces the meat and you can lose delicious juices. Depending on the thickness of the steak, it will reach its desired degree of doneness in 10 to 25 minutes. For rare meat, steaks that are one inch thick will need a total of 10 minutes on the grill, including searing. Steaks that are between one and one-and-a-half inches thick will be rare in about 12 minutes. For medium-rare meat, increase the cooking times by five minutes. For medium-well done meat, increase the cooking time by 10 minutes (for example, a one-inch-thick steak, needs about 20 minutes to reach medium-well done).