Except the slot is on the top. Bees cluster on the bottom and build ladder comb UP to boxes, which leaves the top channels open. Why so hot on these frames I wonder? If you are using duragilt or something I am sure they slap together faster, but if you are on foundationless or using pure wax they will not work right. Gravity is your friend. Better to hang wax...
I have 60 plus hives and our slotted top new style frame is the only frame I use except for our new foundationless. I pin my deep frames using the second hole down on one side and the third hole down on the other side.
I find the bees fill in the gaps in the top slot and SHB is not a huge problem. I do not pin my mediums, I use rubber bands when I extract.
This frame is very fast for install of wax.
I have tried some of the Kellys frames that you have referred to and like them. We even used them for foundationless with a strip of wax as a starter. We cut the wax in strips with a paper guillotine and place in the top slot then place a few small brads to pinch the slot tight. This got the girls making worker cells right at the start. I haven't tried there foundationless frames yet.
I've assembled over 1000,own 500,&the only complaint is beetles like the top slot .If put in the hive just before flow the bees fill the slot,if not melt a little wax to fill it.I've assembled over 3000 frames this spring[few 75-90 yr old beeks here&I have air tools to their hammers]&IMO the time to fill the top slot is worth it&they square up&fit well.
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