Flow® hives are based on the Langstroth standard so any Langstroth equipment is compatible with your Flow® hive, but be aware that there are some differences in some of the hive sizes.

https://support.honeyflow.com/flow-hive-flow-frame-weights-and-dimensions/

Choose 8 Frame Langstroth size to suit a 6 Flow™ frame hive
Choose 10 Frame Langstroth to suit a 7 Flow™ Frame.

Flow® and Flow Hive® are the registered Trademarks of BeeInventive Pty Ltd