Hi! Sorry for the late response.<p>You are mostly correct. However, per your links, using &quot;HEPA&quot; with any prefix or suffix is problematically allowed. The specifications laid out by the DOE are mostly for DOE facilities and so they have their own version. Everyone else is using their own brand of &quot;-HEPA-&quot; which can mean &lt;0.003 pm or not and is therefore misleading.