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Photo: Li Hao/GT The cultural significance of smoking This isn't the first time that China has bumped up against the question of the implications of its cigarette packaging

Maintenance Reality: What Youll Actually Need to Do Heres the honest maintenance schedule based on my three years of testing: Weekly/Bi-Weekly: Vacuum or wipe the pre-filter (takes 2 minutes) Check air quality indicator if present Monthly: Wash washable pre-filters (WINIX, some Alen models) Inspect for unusual odors indicating filter saturation Every 6-12 Months: Replace main filter on most units Reset filter indicator light Every 1-5 Years: Replace HEPA/carbon filters on long-life units (Austin Air, IQAir) Pro tip: Set a phone reminder for monthly pre-filter cleaning

This true HEPA filtration is the same that is used in clean rooms and hospitals

However, due to the Covid-19 pandemic, courses have moved online

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