Abstract: In an oil storage tank having an interior oil storage chamber and a tank opening in one of the boundary walls, a heating assembly is supported to extend into the interior oil storage chamber from the tank opening. The assembly includes a casing of walls surrounding with a casing mounting flange mountable in sealing engagement relative to a tank mounting flange about the full perimeter of the tank opening such that the casing protrudes into the interior oil storage chamber of the oil storage tank. The heating chamber is suitable sized and configured to operably receive a catalytic heater therein. The heating chamber further accommodates entry of combustion air and combustion fuel into the heating chamber and exhaust of emissions therefrom.

Abstract: A hopper bottom for a grain bin includes a hopper wall having an inverted cone shape so as to taper downwardly and inwardly towards a central bottom opening and including ventilation openings therein. Perforated ducts extend into the grain bin from the ventilation openings. According to one embodiment upright support legs support the hopper wall above the foundation. Each upright support leg has a hollow interior chamber to direct air from an inlet manifold structure to the ventilation openings in the hopper wall. According to another embodiment, an outer support wall supports the hopper wall above a floor structure which collectively enclose a manifold space which directs air from a blower into the ventilation openings in the hopper wall.