@DonShift3 @Bewickwren @OhloneTactical You want better filters for that. These are MERV13/14, not quite HEPA level. Good for filtering the air within a closed space in a few passes, but not good for building positive/negative pressure spaces.
@DonShift3@Bewickwren@OhloneTactical你想要更好的过滤器。这些是MERV13/14，不完全是HEPA水平。适用于在封闭空间内过滤几次空气，但不适用于建筑正/负压空间。