A gravity heating system, also known as an octopus furnace, is typically a ducted system that doesn't use a fan, but rather is designed to allow the heat to rise naturally thought the ducts to the...4/21/2018
DefinitionA gravity heating system, also known as an octopus furnace, is typically a ducted system that doesn't use a fan, but rather is designed to allow the heat to rise naturally thought the ducts to the different areas of the structure.
