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I've had them on every fifthwheel we've owned for the last ten years. Never a single problem. There is no significant restriction in airflow, as can be seen in Glenn's photo. We spend a lot of time where mud daubers live and they love propane. Let them in and they'll definitely foul up the works. And I understand it's a lot of work and/or expensive to get their nests out of there so you can use the furnace.
We've been in extended subfreezing temperatures with the furnace running a lot the past three winters and never a problem with the furnace.
SGF, they're available at RV dealers, camping world, etc. They're not expensive. There are different styles for different furnace exhaust ports so take a look before you go buy them. Most Montanas take the ones like Glenn has, including ours. J.D., I'm surprised yours has a rectangular one since you have the same year and model as ours. Maybe the first owner adapted it from his own tradein. In any case, if it works...
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