If you're looking for a smarter way to manage air filters in your HVAC system, a universal external filter rack is one of the most practical upgrades you can make. At DuctworkDelivered.com, we carry high-quality 1-inch, 2-inch, 3-inch, and 4-inch external filter racks—all built from durable sheet metal, ready to ship, and easy to install.
What Is a Universal External Filter Rack?
An external filter rack is a sheet metal housing that mounts to the return side of a furnace, air handler, or plenum. Instead of placing filters inside the unit, external racks let you slide them in from outside—making replacement faster, cleaner, and more convenient. No more squeezing into tight access panels or pulling apart return ducts.
Choose the Filter Rack That Fits Your System
We offer four standard sizes to match the most common HVAC filter types:
1" Filter Racks – Best for tight spaces or residential systems where space is limited. Lightweight, cost-effective, and easy to mount.
2" Filter Racks – Our most popular option. Ideal for homes and light commercial setups. Balances filter surface area with a compact footprint.
3" Filter Racks – Typically used in commercial systems. They offer improved filtration performance and longer service life between filter changes.
4" Filter Racks – Designed for maximum efficiency and airflow with minimal pressure drop. Great for systems where air quality and maintenance intervals matter.
Every rack includes a removable access door and mounting tabs for a straightforward install.
Built for HVAC Pros and DIYers
These aren’t off-the-shelf throwaways. Our racks are made from galvanized steel, built to last, and designed with real-world installs in mind. Whether you're retrofitting an old system or finishing a new install, our filter racks save time and eliminate hassle.
Pair one with a custom plenum or return box from our ductwork builder and you’ll get a complete, ready-to-install solution—precision-fit and made to order.
Why Order from DuctworkDelivered.com?
✔️ Available in 1", 2", 3", and 4" sizes
✔️ Custom dimensions available
✔️ Made in the USA
✔️ Fast shipping
✔️ Designed for real HVAC installs
We don’t overcomplicate things. You get high-quality, custom duct components delivered fast—so you can get the job done right.
Get Yours Today
Whether you're upgrading airflow in a residential system or finishing a commercial install, a universal external filter rack is a simple and effective solution. Browse our options today at DuctworkDelivered.com or contact us if you need a custom size.
Cleaner air, easier maintenance—no more messing around inside your unit.
