1. 

   wrbtrader

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   School boards, some scientists puzzled after Quebec says classroom air filters don't work
   
   Wow...
   

   • https://montreal.ctvnews.ca/school-...ys-classroom-air-filters-don-t-work-1.5259702

   wrbtrader

    

   #11     Jan 8, 2021

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2. 

   mlawson71

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   So purifiers do work if properly installed?

    

   #12     Jan 11, 2021

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