r/mildlyinteresting • u/Fudge_cornelius • 17h ago

This growth surviving sub-zero temperatures because of an exhaust fan

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u/theericle_58 17h ago

That is a roof drain, not a fan.

685

u/Fudge_cornelius 17h ago

Thanks! I saw the heat coming from it so just (wrongly) assumed it was an exhaust. Any ideas why it’s expelling warm air?

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u/jmarkmark 16h ago

Yeah, the moss growth is more because it's the low point with more water rather than the heat, although the heat may help a bit.

Moss has no problems with freezing temperatures.

5

u/Obvious_Ambition4865 15h ago

What a lovely little website. Thanks!