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  1. #1
    Join Date
    Aug 2018
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    Options to change filter size?

    My washable filters caused a restriction that caused cavitation and threw my motor/wheel out of alignment. I solved that issue and even after a deep cleaning I still get a little thudding on high speed with the filter in (none when running bare). These filters are 10 years old and despite regular cleaning they are too restrictive right now.

    Why not switch to a disposable? For some reason the owner decided to go with a custom filter size when they built the house. I guess they wanted the biggest 1" they could fit for efficiency. They are 25.75 x 35 x 1. I cannot find a filter off the shelf close to this size unless I'm looking in the wrong stores. Custom disposables in this size start at $30 a pop. The other unit is an odd size also at 23.75 x 30.25 x 1.

    I have added pics of the setup.

    https://ibb.co/pKs3mPH
    https://ibb.co/Nx8mGH2

    Any thoughts on options here? Maybe installing a filter retainer under the blower (smaller dimensions) but using a 4" to compensate for the reduced footprint? I'm hoping someone has some creative solution that makes it a breeze for my tech to accomplish when he is out this week.

  2. #2
    Join Date
    Mar 2018
    Location
    Chico, Ca #StateofJefferson
    Posts
    681
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    Can you take any pics from a bit further back to show the whole return ducting? How big are the return openings?

  3. #3
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    22,261
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    How in the hell does a washable or any filter cause cavitation?

    W T F

  4. #4
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    9,085
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    Quote Originally Posted by elecguy View Post

    My washable filters caused a restriction that caused cavitation and threw my motor/wheel out of alignment.

    I solved that issue and even after a deep cleaning I still get a little thudding on high speed with the filter in (none when running bare).
    These filters are 10 years old and despite regular cleaning they are too restrictive right now.

    Why not switch to a disposable?
    For some reason the owner decided to go with a custom filter size when they built the house.
    I guess they wanted the biggest 1" they could fit for efficiency. They are 25.75 x 35 x 1.

    I cannot find a filter off the shelf close to this size unless I'm looking in the wrong stores.
    Custom disposables in this size start at $30 a pop.
    The other unit is an odd size also at 23.75 x 30.25 x 1.

    I have added pics of the setup.

    https://ibb.co/pKs3mPH
    https://ibb.co/Nx8mGH2

    Any thoughts on options here?

    Maybe installing a filter retainer under the blower (smaller dimension ) but using a 4" to compensate for the reduced footprint?

    I'm hoping someone has some creative solution that makes it a breeze for my tech to accomplish when he is out this week.
    Adding a housing for 5" thick 500+ Sq inch MERV 8 or 10 filter would definitely be an appropriate, non-creative/ Common solution.

    https://www.discountfilters.com/air-...-pack/p100951/
    OR SIMILAR / EQUAL

    The filter certainly did Not cause cavitation. Cavitation applies to WATER ( OR Liquid).
    _______ How about … Blower Vibration

    https://www.bing.com/search?q=cavita...uZ2jOV8HD0qIyU
    Last edited by dan sw fl; 06-09-2019 at 05:08 AM.
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  5. #5
    Join Date
    Aug 2018
    Posts
    10
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    Thread Starter
    Sorry, wrong nomenclature... I'm used to the term for when a prop in the water is outpacing the ability for the water to flow and the prop becomes unstable, without distinction for the technical definition of producing air pockets in the liquid. I was referring more to the effect on the prop than the medium it is interacting with.

    But yes, supply side air flow was too low for the blower and causing it to vibrate.

    I will tell him about the 5" setup referenced. Thank you.

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