There is no single IAQ product that can solve every customer’s IAQ problem. Even the best product might not fit. In the same way that you often mix and match equipment components, you can often provide the best IAQ solution by including multiple products.
The only way to know for certain that something is effective is to measure it. Okay, some IAQ manufacturer’s do measure, but ask yourself, measure “where” and measure “what”?
One consideration when evaluating your IAQ product offering might be where the product or technology was developed. I’m not referring to a “space station” story but to real-world installations that span years and even decades of proven performance.