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This furnace is ok IF....
If there are no registers, return or supply, in the garage.
If the drain has been heat taped.
If the furnace is raised off the floor at least 12"
No registers because we do not want a passage for exhaust into home.
Heat taped to prevent drain from freezing
Above floor so no ignition device (motor spark) near flammable vapors
I apologize..but typo...the unit must be 18" above floor