pre-filter – Smart Air

What Combination of Air Filters Do I Need for my Home or Office?

2023-07-082023-07-08 by Thomas Talhelm

What combination of air filters do I need to protect myself against all kinds of air pollution – absolutely everything? This will sound like a grand claim, but you only need two filters. This post explains why and shows the data. What the Big Purifier Companies Say about Filters Big …

Why Air Purifier Pre-Filters May Be More Harm than Good

2020-12-012020-12-01 by Paddy Robertson

Most purifiers on the market come with a pre-filter. That would make one think that pre-filters must be a good thing, right? However, most purifier companies also love to selling people 6-stage filtration, or no – 7-stage filtration! But the science behind purifiers is surprisingly simple. Two types of …

Q&A

2020-07-152014-01-01 by Thomas Talhelm

joshuaw81 提问: Hi Thomas, just started one of your cannon kits earlier today and it’s already turning gray. Already a fan of your work! Two quick questions for you: 1- I received a foam/fiber square that is white on one side and light green on the other. I’m assuming this …