Custom Air Conditioning Filters


Because, If it doesn’t fit. It doesn’t filter.

We start your custom air conditioning filter by building you a permanent custom sized frame of sturdy aluminum and a permanently attached electrostatic charged screen. They won’t bend, melt or warp like plastic or cardboard furnace filters.

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We hand make every furnace filter frame to your exact size, so you’ll always have a filter that fits perfectly!

It’s the last furnace filter you will ever purchase.
All furnace filter frames are backed by a lifetime warranty!








We eliminated the path of least resistance.

To insure that all the air and pollutants go through the furnace filter and not around it, our filters feature our patented anti-bypass seal. When your air conditioner or furnace turns on, the difference in pressure causes an air tight seal. No bypass means your filtering 100 % of the air.


Air Filtration Options:air-handler

You choose from many types of air conditioning air filtration refills for your new furnace filter. You can use our popular Bio Sponge, Bio Sponge plus®, or our ultra-efficient Micro Sponge®refills.

All offer outstanding protection from airborne contaminants. Select the refills that fits your needs. You can also choose to add an activated carbon or zeolite refill, if you wish to control odors and V.O.C.’s.

Replaceable furnace filter refills assure a new, fresh furnace filter every time. No more guessing if your furnace filter is really clean and healthy.



You’ll never have to wait in store lines for your furnace filters again!

No more aggravating trips to the store to try and match sizes, and winding
up with an ineffective furnace filter. Simply contact your local Air Spong dealer, and we’ll rush your furnace, AC filters right to your door.

Initial package includes a permanent frame, and a one years supply of refills.

Request an Estimate

Service Type
Custom Air Conditioning Filters
Provider Name
County Line Air,
11197 Sacco Drive,Boca Raton,Florida-33428,
Telephone No.561-477-1212
Boca Raton
Custom built filters for your air conditioning with an electrostatic charge for maximum efficiency.