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Floor furnaces should be protected from severe wind conditions because excessive wind can influence the performance and efficiency of the heating system. If wind enters through the floor furnace's vent, it can reduce the effectiveness of the heat exchange and may cause the combustion process to be disrupted. This can lead to insufficient heating within the space and can also create potential safety hazards, such as improper venting of combustion gases. Protection from wind ensures that the furnace operates safely and efficiently, maintaining optimal indoor comfort.

In relation to the other conditions, while rain exposure and high humidity can certainly affect various HVAC components, they are not specific risks associated with floor furnaces compared to wind conditions. Similarly, electrical surges are more relevant to electrical components and systems rather than the direct operations of a floor furnace, which primarily relies on gas or similar fuel sources for heating.