Shop Furnace and AC Filters - Trusted Filtration Retailer Since 2006

Over a million filters sold and replaced. That’s billions of particles removed from indoor air. Trust your air to us. RTF has been In business for 14+ years and is a preferred online retailer for AAF Flanders Furnace and AC Filters

Quality Furnace and AC Filters Online

What’s your need? Commercial? Residential? Industrial? HEPA? We have you covered! At, you’ll find the perfect HVAC filter online for your system. Our stock features leading manufacturers!

Buying furnace and AC filters online at is easy, convenient, and saves you time and money. No high-pressure sales. No time-consuming service appointments. No searching for weeks or months for your filter size. Just friendly, knowledgeable filter experts dedicated to helping you select the right filters for your system.

With thousands of sizes to choose from, you’ll never have to search for your filter again! You can even buy custom furnace and AC filters online! We’ll send you perfect fit filters for your HVAC system. We deliver filters to you for free, too! Whether you live here with us in the Pacific Northwest, or you’re in Texas, Chicago, New York, Los Angeles, or Florida, we deliver for free anywhere in the entire contiguous United States – even oversized or special order filters.

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AstroCel HEPA Filters by AAF Flanders

AstroCel HEPA Filters by AAF Flanders

High Efficiency Particulate Air (HEPA) AstroCel I High Efficiency Particulate Air (HEPA) filters are the most efficient air filters commercially av...
Easy Ways to Improve the Air Quality in Your Home

Easy Ways to Improve the Air Quality in Your Home

Poor air quality can cause several health-related issues. To prevent these, follow some of these easy ways to improve the air quality in your home.

CEO letter about COVID19

COVID-19 Letter from our CEO

As the coronavirus continues to spread, we have taken a proactive approach at RTF to keeping our employees safe while sustaining a consistent level...