Forum Discussion

wopachop's avatar
wopachop
Explorer
Jun 27, 2021

Better AC filter for those who havnt seen it yet

Done this the last couple summers with a household filter. Its the black label from Lowes. The different sizes are the same price, so get the 20x30 (or largest you see) if you decide to try it.

I remove the foam filter and the plastic screen. Last year i used a wind meter to measure air speed coming out of the vents. That was with a smaller filter last year and it didnt seem to restrict flow.

Also last year we had lots of fires. People were putting these filters on the back of a box fan to filter the air. Not the worse idea.

  • hypoxia's avatar
    hypoxia
    Explorer
    Jun 29, 2021
    Gdetrailer wrote:
    Pleated filters like that are considerably more restrictive to air flow than the original washable foam filter.

    Agree! The original style were there for a good reason. You are not doing your A/C unit a favor. These units were not made for that filter.
  • Gdetrailer's avatar
    Gdetrailer
    Explorer III
    Jun 27, 2021
    Pleated filters like that are considerably more restrictive to air flow than the original washable foam filter.

    It is good that you checked air flow but even a slight restriction under the correct conditions may result in the A/C cools to freeze up into a solid block of ice much faster than they would otherwise.

    I use those filters on my wood burner fan box to reduce wood ash from getting blown through the house. I modified the fan box to use two filters in fact side by side and even that causes a noticeable change in air flow.

    I won't even consider them on my home furnace, causes the furnace to trip the overtemp limits once and a while..

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