We change out the filter once a month due to people with allergies. We used to use store brands but this filter truly works better at trapping particles.
This is the best filter that I have found for my central air conditioning system. I also use the same type of filter in my heating system. Due to the size needed I use a combination of two different sizes for the heater. I would recommend your filters to any one who is looking for a great filter for there systems. You get a great product for a great price and are made of high quality material. YOU CAN TRUST YOUR FAMILIES HEALTH WITH THESE PRODUCTS.
Why do they put the installation date reminder box on the cardboard side with the metal grate. According to the instructions this side should face inward towards the blower??? Why does the picture in the instructions show the air flow ARROW facing away from the diamond shaped/metal side? This is confusing to have instructions say "wire side towards furnace fan but your pictures show the opposite. Thank you for the sticker reminder to place on my calendar.
I have been using these 18x18x1 filters for 5 years. Why aren't the best filters available? I have asthma and need the best filter. Better is just cleaning the air Best would really cleanse the air. Why not have them on sale? If we can't get them discontinue them and recommed a best filter.