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While many theoretically restrict entry to adults 21+, that often is not well enforced
The legislation also mandates that an adult over 21 present his or her ID to the courier upon delivery and requires online retailers to comply with rigorous requirements such as registering with the U.S
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors
There may be drawbacks to using a DIY air cleaner as compared to a commercial air cleaner, such as increased noise and heat generation from the fan motor, and limited data on how well DIY air cleaners filter smoke particles
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