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I assume you have a Suburban NT30 or something similar. If not, disreguard the following.
The furnace is designed so that the fan comes up to speed before anything else happens. If it fails to ignite for any reason (and an absence of LP would certainly be a reason) the fan will continue to run indefinitely. Of course, turning it off at the thermostat should shut it down IF you actually turn it off. Simply turning down the thermostat will not shut it off.
If you have, in fact, turned off the furnace at the thermostat, and the fan still runs, I am at a loss. Could be a bad limit switch, of course. Could be a bad thermostat. The latter could be checked by the simple expedient of unscrewing the red lead(s) at the back of the themostat.
Not to excuse my poor diagnostic skills, but some more details would be helpful - kind of thermostat. Exact model of furnace. A more complete discription of the problem.
Mark
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