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charwoman 3 points ago +3 / -0

We have had one for years. Our alarm is set for 1500ppm for the house, in front of a cold air return. Life is better when it's under 1000.

2
DoesItWorkAlready 2 points ago +2 / -0

I went into my son's closed room this morning (no AC, doors windows closed)

1000PPM and stale stuffy air.

Not healthy for any longer period of time.

Your mask ranges betwen 2x - 30x worse, depending on the mask.