Air Filters
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Thread: Air Filters

  1. #1

    Air Filters

    It's time I changed out my air filters and the same question always comes up: Do you get what you pay for? Are the higher priced one's really worth it in the long run?

  2. #2
    Join Date
    Jun 2011
    Posts
    375
    Depends on what you want your filters Tp do. I use 2inch pleated at home. I replace them when I get too much restriction across them and my cfms drop close to the minimum required for my unit. I get mine wholesale, no way I would buy the pleats from home despot. Wife has allergies so I like the 2 inch to grab pollen etc.

    If you just want to keep your coils and heatx clean, 1 or 2 in taw should be fine.

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  3. #3
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,095
    She short answer is it depends....
    If your duct system can handle the better filters that is the way to go but I would bet less than 10% of the duct systems out there can.. If you are looking for a good filtration you would want to have a media filter cabinet installed after a full duct assessment was done. In many cases a cheaper filter will filter BETTER than a restrictive one as the velocity of the air is less. If the velocity is too great the particles will get sucked through the filter instead of being captured and retained.
    ...

  4. #4
    Join Date
    Jun 2010
    Location
    Danbury Ct 1/2 hour from NYC
    Posts
    204
    NO. The 3m filters at HD are restrictive and most split systems installed around here are short on return air. I know a ton of guys who live by the IT'S ONLY THE RETURN. It;s only the amount of air the system needs to operate efficiently, quietly, and most of all it's lifespan of the units and motors! There is nothing wrong with regular 30 day 1 inch filters when they are changed when they are supposed to around umm lets see maybe 30 days. All jokes aside it depends on your ductwork and amount of return air you have but nothing like a clean filter. I install Trions or spaceguards on the majority of my jobs but I only have a pleated 1inch in my own house I just stay on top of it. Restrictive filters can also cause drainage issues.

  5. #5
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,728
    The way around the restriction problem is a little creative sheet metal work to allow a larger, thicker filter to be used. A thicker filter has more area, and using a larger filter multiplies that effect. Since the CFM through the medium must remain the same, the larger the area, the slower the airflow to make that CFM. So, the slower air has particles drop out of it more easily, like a slow river has a lot of silt on the bottom, where a fast river has none.

    I would not stick with the 1" filtrete. I'd go 2" at the very least, and make a filter rack that can hold a big filter.
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