Castle Filters

Proudly designed and built in the USA.

A family owned and operated business located in Northern California. We’ve been in business for over 25 years in the dirt-bike filter world. After experimenting with a home HVAC filter utilizing our tried and true patented technology, we knew we had a hit. Thank you for supporting Castle.

-Brad, Gary, Ryan, and Bob Jensen

Our Promise

Satisfaction Guaranteed.

We stand by our products. If for any reason you are unsatisfied, or have any questions or concerns about your filter, please reach out to us directly. We will do what it takes to make it right. We want your Castle Filter to be the best filter experience of your life.