When you buy a new type of product you are unsure if it will perform as the company describes in its supplement. Well I can say that this product exceeds all expectations. I bought two filters for my house and after installing them I felt the air was flowing with less resistance which was messing up my system. I installed Castle Filters in January 2018 and my system is running better than before. I recommend Castle Filters to anyone who wants their heating and air conditioning system to work better than ever.
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