The metal strip does need to be installed, as it provides structural strength to the Flow Super after most of the back side is cut away. It also covers up the gap made by the rebate in the brood box below, which blocks bees from exiting through the back of the hive.
We provide the metal strip to customers who order a Flow Hive or Flow Super from us. If you’ve purchased Flow Frames alone and are intending to modify your own boxes, we can send the dimensions to you. Contact our friendly customer support team.