Quote:
Originally Posted by maple_leaf_eh
The blue extinguishers are supposed to work better in the cold.
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I don't think it was just the blue ones that were designed for cold weather use. My red one is listed as functional from -65F to 120F (see bottom line in the first photo). I suspect as Rob said above, there is no difference other than the colour. These were probably the standard because of the high range of operating temperatures.