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First welcome to the forum! Second, unless someone added a filter system Montana's don't have a furnace filter. If they did add it, it would brobably be behind the slots in the stairs if your rig is so equipped. On rigs that have the return air under the stairs some folks have done that. Third, I hope you find us helpful.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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