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A comment on A small DIY air purifier. Parent comment

Re:A small DIY air purifier by yjftsjthsd-h on Tuesday January 21, 2020 @09:33AM (#22107174)
Clarification: triangle goes on the in or out side of the fan?
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Re:A small DIY air purifier by post_break on Tuesday January 21, 2020 @09:36AM (#22107215)
Doesn't really matter as long as the filters are in the correct orientation. However it would be beneficial if the air is clean before it goes through the fan.
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Re:A small DIY air purifier by spookthesunset on Tuesday January 21, 2020 @12:29PM (#22109073)
Put it on the intake. It will keep the fan clean.
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