>Open mesh flours is in my opinion only for > ventilation. I wonder if there is some slight benefit to the bees not having to walk through the detritus that accumulates on the bottom board? Ventilation is good, though. Steve Noble :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::