Permanent Replacement Filters for 3, 4, or 5 inch Filters

Why spend $100's per year on replacement filters?

Replace your 3, 4 and 5 inch Honeywell, Trion, Trane and other whole-house filters with a permanent, washable, lifetime-warranty filter. Contractors like to install these systems and then charge $75 - $150 everytime they change the filter. Stop wasting your money! Never buy another filter again.

These 2-inch filters also work great in Geothermal systems!

Common original filter sizes are 16x20x4, 16x20x5, 16x25x4, 16x25x5, 20x20x4, 20x20x5, 20x25x4, 20x25x5. Our permanent filters are 1-3/4 inch thick and can be made in ANY CUSTOM LENGTH and HEIGHT in 1/8 inch increments for NO ADDITIONAL COST.

Why is your filter thinner than my original filter? Simply because electrostatic filters cannot be made in 4 or 5 inch widths. This would result in too much filtration media and would impede air flow. Our filters are 1-3/4 inch thick with aluminum frames. They are washable and can be used as permanent replacements for your 4 and 5 inch filters. (See Point 3 below) When choosing a filter, it is important to look at dust arrestance as well as air resistance. Our filters are designed to provide an excellent balance between HIGH dust arrestance and LOW air resistance.

What is the MERV rating on your filter? These filters are comparable to a MERV 8 filter. They develop their electrostatic charge naturally as air passes through them. They do not have to be plugged in to a power source.

** FREE SHIPPING **

Our 2-inch BoAir 5-Stage filters feature a very low 0.10 W.G. air resistance and excellent 90% dust arrestance.

FILTER SIZING GUIDELINES

1. We can make our filters in 1/8 inch increments. Please type the EXACT filter size (Width x Height) you need in the box above. All filters are 1-3/4 inch thick.

2. Please double check your size as we cannot provide refunds due to errors in measurement. When measuring the filter slot, please allow room for any metal flanges, slots and/or doors in the filter housing area.

3. Please note that our filters are exactly 1-3/4 inch thick. Even though they may be thinner than your current filter, they are an effective replacement for the larger filters. However, some applications may require you to put spacers next to the filter to fill in the extra space. Most of our customers simply use blocks of wood or other inert household objects as spacers.