At, our primary aim is your happiness. That's why we dedicate ourselves to ensuring your complete satisfaction with every purchase. Our commitment to excellence is reflected in not just one, but two guarantees. In the unlikely event that either you or we make a mistake with your order, we will go above and beyond to rectify it and make things right with our Filter Fit and Satisfaction Guarantees.

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We get it. Measuring your own HVAC system for custom furnace and AC filters can seem a little scary. But fear not! The team is here to help you succeed! And if you make a mistake, no worries. With our Filter Fit Guarantee, you can’t go wrong!

Here’s how it works. If you have an “oops!” moment measuring your filters and the new one doesn’t fit, simply call us at 866-469-8556 or send an email and we’ll remake that exact same product for you for free within 30 days of the date your order was delivered.* You just cover a $20 replacement shipping fee, and we’ll get your new remake right out to you.

See fine print below.

Tips for Measuring Filters

To make sure your custom filters fit right the first time, here are some tips from the filter measuring experts:

  • Never just assume what is printed on your old filter is the exact size. Measure your existing filter down to 1/8" for both the length and width and use those measurements for your new ones.
  • Check out our "How to measure your air filter" page for more information on getting the perfect fit.

Still a bit nervous? Start by ordering just one case of filters if you need multiple sizes before ordering for your entire system. That way you can see how quickly your custom filters are delivered (for FREE, BTW) and how perfect they fit, so you can order more with confidence!

If you have any questions about measuring your filters before placing your order, call our Customer Care Team. We’re here to help you get the perfect fit, every time!

* The only time you may incur a remake charge is if there is a difference in price between the original product and the remake.


If there is a defect in a product’s material, workmanship or it was not made to the same size and specifications you ordered, we promise to resolve the issue at no cost to you for up to 90 days from the date of purchase. We even pay for shipping! And if you’re not happy with your custom filters for any other reason within the first 90 days -- you don’t like the MERV rating, you need a different style (basic or pleated), etc. – we’ll remake that same product in the same size for the same great discount price you paid, plus give you an additional 10% off. Please see our Returns page for more details.

Fine Print

The Filter Fit Guarantee gives you the confidence to measure your own custom filters without worrying about making a mistake. If you do have a measuring mishap, we will remake that product to your corrected size specifications at no cost to you, other than a $20 shipping fee. The only time you may incur a remake charge is if there is a difference in price between the original product and the remake.

The Filter Fit Guarantee applies only to necessary remakes of a product due to customer error in measurements (i.e., incorrect/wrong size filter measurements provided by customer on order) resulting in product that is made to wrong size.

Product remakes will be made with customer’s corrected measurements applied to the original product ordered only. Product(s) will be remade in same style, rating, etc., per original order.

Requests for product remakes under guarantee must be made within 30 days of delivery date of original product to customer.

Customer must provide with photo showing how filter does not fit system when requesting remake under this guarantee.

Remakes under this guarantee are limited to one (1) case per order and a total of two (2) cases per household per customer lifetime whether for same or different product(s).

Any mis-measure remakes after the first four will be made at customer cost for the price of the original order, including any discounts, plus an additional 10% off.

Any product ordered outside recommended product sizes per specifications on our product pages is not covered. Bulk orders of 2 or more of the same product are not covered under this guarantee. Guarantee excludes HEPA filters, Freight or LTL Shipped Orders, and large filter sizes over 30" by length and/or width known as "Double Filters" (made with two combined filters, SKU includes "D"). No cash refunds are available under this guarantee.

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