The furnace should be inside under a cabinet or the refrigerator. It should be within 6 inches of the exhuast vent leading outside. Look for a plastic or wood slotted cover near the floor, this is the air return and it should be behind it. There are several things to check, make sure spiders or mud dobbers have not clogged the exhaust vent, the air flow switch could be going bad or the high temperature limit switch is bad. These are the first things i would check. Also if you ran your propane tanks empty and refilled them it may take several attempts to purge the air out of the gas line.
Good luck
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