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First of all, if you read the site for more than 3 seconds you'll see that they now have distribution in Canada (in Toronto, no less) so there's no need to import.
Secondly I've seen these in use: they're generally "safe" but it really does come down to the field owner. Outdoors if it's dry and there's a lot of combustible material (pine needles and the like) it may be a hazard anyway. Indoors, I wouldn't recommend using them in a small enclosed space (i.e., something smaller than a warehouse).
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