UPDATE 12-5-2018

We are working on a WiFi/Ethernet

​version of the CFM, stay tuned!

Short video of CFM-GM test.

Thanks to everyone for your support!


      Our Product


HVAC filters are for the most part, out of sight and out of mind! Using a Clogged Filter Monitor helps you stop throwing away good filters while tossing out bad ones. This saves you money while helping to protect the environment.

Welcome to AIRFLOW1, where we are striving to produce the best, most cost effective line of Clogged Filter Monitors for residential and commercial HVAC systems.

     Our Mission

HVAC Filter Dirty,

Why Bother?

The CFM-GM and the CFM-WM are our first products to be released. The CFM measure a filters differential pressure and when it is time to change the filter, the red LED begins to blink.