@politicsNdogs @Emgee_7 @fitterhappierAJ CO2 tells you ventilation (outside air) not filtration. The filtration is a supplement.
@政治犬@Emgee_7@fitterhappierAJ二氧化碳告诉你通风（室外空气）而不是过滤。过滤是一种补充。
@politicsNdogs @Emgee_7 @fitterhappierAJ CO2 tells you ventilation (outside air) not filtration. The filtration is a supplement.
@政治犬@Emgee_7@fitterhappierAJ二氧化碳告诉你通风（室外空气）而不是过滤。过滤是一种补充。