to make ventilation better,,,,,more vents at front along bottom and at back at top at least a four inch gap covered obviously with wire netting netting of some sort,,,,but,,,thats only me and allways done me brilliant when kept pigeons,,,,,,you will find mostly that the best pigeons get the top perches and seem to like the fresh air more,,,just what i observe in my time in pigeons,,,hope that gives you a bit of information to help you more !