Right filter.   Right size.   Right count.   Right away.
The Right Filter, Right Away! (612) 721-4000

Replacement Filters Must Fit – or There Might Be Trouble

The replacement filters you need are out of stock, so you grab the next best thing and keep your fingers crossed.


You could risk damage to your system, higher energy bills, and poor air quality. It’s important to use the right replacement filters in your system to keep it running at peak efficiency.

Filters perform an important purpose. They screen out particles that may damage your system. They also keep particles from recirculating and keep indoor air fresh.

The wrong size replacement filters may have gaps around the filter frame that allow air to enter the system without passing through the filter media. Any contaminants in the air are then passed through the ductwork and into the motor itself.

If you have a poorly fitted baffle grease filter, the greasy air can cling to the ductwork in the system and build up over time, creating a fire hazard. If you own an office building or a commercial property, mold spores entering the system may settle on condensation within the ductwork in HVAC systems and multiple, causing breathing problems or allergic reactions.

These are just two examples of how an incorrectly sized filter can be harmful. Filters that are too large won’t fit into the ducts. The wrong filter media can make it difficult for the system to draw in a steady supply of air. This can force the motor to work harder, use more energy, and eventually, wear out faster.

Replacement filters should match the original filters that your system specified. If you’re not sure whether certain replacement filters will work with your system, contact us at Twin City Filter Service. We can find the right replacement product, with the right count and right size, right away.  Whatever your needs we can help you with any questions you may have about your filters.

Twin City Filter Service offers a wide range of filter materials, pads, frames and more. Custom filters are also available. Commercial air filters, bulk media, and other materials are available at our location or upon request. We ship same day to customers coast to coast and offer next day delivery in Minnesota, Wisconsin, Iowa, South Dakota and North Dakota. Twin City Filter Service may be reached at (612) 721-4000.

About Us

For over 70 years Twin City Filter has been a family business providing both filter service and filter sales. We began serving the Greater Twin Cities Metro Area and grew into a coast to coast, border to border business.

Speed, Accuracy, Quality and Value

We provide filters, custom filters and service to contractors, office complexes, condos, business parks, colleges, and other industrial, commercial and residential developments.