I really like my elastomeric too, but it is almost impossible to wear when the temperature is approaching 40C, because my face turns into a tropical microclimate. I've gotten perilously close to a dangerous level of overheating like that, and more than once. Even when the outside humidity is in single digits, it builds up FAST in there.
Edit: I don't much like falling back on less-effective masks, but if it's that or heatstroke, I'll use the less effective one and try to mitigate in other ways.
...can confirm, your furnace filters cost well more than the ones available locally. For a brief period, it was almost impossible to find commercial HEPA filters, and they were astronomically expensive when available at all. At that point, the CR box was the right choice.
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I really like my elastomeric too, but it is almost impossible to wear when the temperature is approaching 40C, because my face turns into a tropical microclimate. I've gotten perilously close to a dangerous level of overheating like that, and more than once. Even when the outside humidity is in single digits, it builds up FAST in there.
Edit: I don't much like falling back on less-effective masks, but if it's that or heatstroke, I'll use the less effective one and try to mitigate in other ways.
...can confirm, your furnace filters cost well more than the ones available locally. For a brief period, it was almost impossible to find commercial HEPA filters, and they were astronomically expensive when available at all. At that point, the CR box was the right choice.
Not so much, any more.