>>told me that some important factors to consider are not restricting air flow (use screened bottom boards) and allow ample entrance openings under the trap (large side rails on bottom board) so the bees can come and go without jamming up at the entrance. I am not sure if I followed. Wouldn't the bees by-pass the pollen trap and use the openings under the trap? Waldemar ****************************************************** * Full guidelines for BEE-L posting are at: * * http://www.honeybeeworld.com/bee-l/guidelines.htm * ******************************************************