I did use sand not but for growing out chicks in our basement before it was warm enough here in CT to put them outside. I always had shavings in the brooders to start. And I had dust, dust, and more dust! I'm not sure how much was chick dander versus sand or shavings dust. What we ended up doing was building a room in the basement that could be totally closed off. I switched back to shavings even in the next-step-past-brooder pens and bought a residential room air filter. It's probably a bigger job than the filter was meant for I clean it frequently. The containment and the air filtration really helped.
Another breeder friend of mine says if you go with the animal bedding wood pellets (like for horse stalls), it will cut down even more on the dust. But as I have bantams, it seems like it would be a difficult substrate for them, especially just starting out.
-Temple DaSilva
Connecticut