So skip the hardwoods then and just go with pine? I can maybe let the shavings 'cure' and dry before I put them in there. Also, I can let the branches dry out before I put them through the chipper. That might just be easier. Thinking about making a sealed chest outside the coop or maybe a big barrel that will hold the dried shavings.For the question on types of wood- cedar in a closed space without good ventilation sometimes causes breathing problems and due to sap I wouldn't use fresh pine shavings/sawdust. We cut our own firewood so we just collect the sawdust from using the chainsaw but let it dry out before storing or using. Throw a piece of rotten log into your run, flip it every few days or once a week. Chickens love the bugs!
That or maybe read more on sand...