Create Custom Air Filters

If you're having trouble finding air filters to fit your system, we have the solution. Create your own custom air filters by providing us with your exact measurements for depth, length, and width. Then, depending on your lifestyle, choose between the MERV ratings of 8, 11, and 13. See below for more information, or jump right in to design your custom HVAC filters today!

Follow the two steps below to build your custom filter.

Select Pleated Filter Style

Select Your Dimensions



Create Your Custom Air Filter

Custom-Size Air Filters in a Range of MERV Ratings

Factory Direct Filters carries the most popular options in filtration efficiency. We find MERV 11 to be best for pet owners and MERV 13 for those with allergies or asthma. If you aren't sure what's best for you and your family or office, check out our MERV guide, or see below for comparisons between energy savings and filtration efficiencies.

If you're having difficulty determining what size custom AC filter you need, our Helpful Tip for measuring your air filter makes it easy. Once you've found your filter's exact size, you can use the form above to begin creating your custom air filter.

Once you know your measurements and MERV rating preference, let us know how many custom furnace filters you want delivered right to your door, and we will get them to you with free shipping, no minimums.

Tip: We use the terms AC, HVAC, and furnace interchangeably because our filters work in all three systems. There's no need to specify anything more than your custom air filter's size and your preferred MERV rating.

Nominal Depth Actual Depth
1 ¾"
2 1¾"
The minimum size is 5" x 5" and the maximum is 40" x 40".
Custom sized filters are not eligible for returns.
Please Note: Due material limitations used to build a custom filter, we construct a double filter (two filter fused together) when any filter dimension is larger than 24.75" on both sides and or larger than 29.75" on one side.
Prices shown are list prices, any applicable discounts are applied in the cart before checkout.