@Mw_ottawa @JimRosenthal4 I see filters marketed as "PM2.5" without more detail. I saw that on Starkvind description but didn't realize there was additional certification.
@Mw_ottawa@JimRosenthal4我看到过滤器在市场上被称为“PM2.5”，但没有更多细节。我在StarkWind的描述中看到了这一点，但没有意识到还有额外的认证。