Wow, what a great technical question. I don't know the answer, but having just replaced the filter on my coach, I used a 3/8" socket and would guess I used 5-10 ft pounds. I certainly could have torqued a lot more, but there is probably no need.
You simply need to assure a seal is made between the rubber hose and the filter. there is minimal differential air pressure so little chance of leakage. The hose clamps provide no support (on my coach), so additional tightening is not necesary. The clyinder is a very strong piece of geometry, but you can easily distort the rubber hose is you try too hard.
Good for you. Good luck!
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