Not in the winter thank goodness, but summer is a different matter, no matter how hard I try to keep them out, there always are a few mozzies and moth that drown themselves in the chemical trays, sometimes I have to filter their little bug bodies out of the stop bath and fixer when I pour the chems back. And of course moths and enlargers....doing a bit of unwanted dodging for you from time to time while dusting up the lens with their moth dust.....