After designing dozens of ducts and mounts for the H2 for myself that were overly complicated or not very effective I wanted one that was simple and **utterly** effective and accommodated am inductive probe ([Omron style](https://www.amazon.com/gp/product/B01JLN4CVE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)) .
The 4020 puts out a ton of air and is overpowered for the job of cooling small patches of hot plastic and with the vent being 20mm x 2.4mm it's more than up to the task.
The fan snaps in with some gentle coaxing and doesn't require bolts although if your fan's dimensions differ, there are bolt holes to accommodate that. Since the bolt path is fairly long I made the diameter of the deepest part of the bolt holes smaller to allow for self-tapping so you don't have to locate a really long M3 bolt.
The probe mount holes are made for heat-set inserts but do have nut recesses behind them if you want to go that route. This was designed around the small Omron style probes but at the last minute I added a BLTouch mount that I haven't tested as I don't use one currently.
Please let me know if it's completely buggered, though.
The main duct and the bltouch mounts are adjustable insofar as height so between the two you should be able to find a happy distance between the bed/nozzle, bed/probe.