We are using a part of our detached garage for our chicken coop. Still in the building process, will pretty much be like a shed within a shed with an enclosed oudoor run. Going to move the girls in soon, they are about to bust out of the brooder. But I had a few questions before we move them in. 1. We don't park cars in the garage, but we do keep our riding mower in there. Is the occasional exhaust (garage door open) from starting the mower enough to be a possible hazard to the chickens? We have plenty of ventilation with a window to outside and vents in the garage itself. 2. Also, we were wondering what the right bedding choice would be? So far we are between woodchips and sand. Have heard many awesome things about both, leaning towards sand. Would appreciate all opinions. 3. Would it make any sense to put wood chips that we get free from a local tree service in the run? Thanks in advance!