Why use entrance reducers? They R extra cost and extra work. In 35 years of consecutive b-keeping, I have NEVER used any. I run the shallow (shallow) side of the bottom board up (up) year round, NEVER the deep side, despite what the books and soit-disant experts say about the necessity of "adequate ventilation." Suum cuique. Jack the B-man ************************************************************* John Iannuzzi PhD | There is some soul of goodness 9772 Old Annapolis Rd | in things evil... Thus bees do Ellicott City (founded 1772) | gather honey from the weed. Maryland usa 21042 | --Apologies to the BardofAvon Hobbyist w/ 19 colonies2many | 21 Italian hives (25sep951945) [log in to unmask] | 35 years a b-man **************************************************************