[Shop-talk] Furnace Filters

[Ian McFetridge]

Hi Jim,
That is basically what I did with our HVAC system when I couldn't get the
4" filters during CV supply craziness.  The 4" was supposed to be changed
between 4 and 6 months, so I just bought the 1" filter and changed it each
month.  I did use bent wire (like what is used to hold an insulation batt
between joists) to press the 1" filter against the side of the enclosure.
We've since moved, but I did not have any issues with it; in fact, I think
changing the 1" filter more often did a better job balancing filtration and
flow.

Best,
Ian

On Mon, Dec 13, 2021 at 5:20 PM Jim Stone <1789alpine at gmail.com> wrote:

> The company that installed my HVAC system a few years ago used a filter
> box on the return line that takes 20” x 25" x* 4”* filters, which is an
> unusual, and thus expensive, size - filters generally run about $25 each -
> that is not readily available other than online.  During construction, my
> general contractor just had a cheap 20” x 25" x *1” *filter in there that
> seemed to work just fine.  I checked the installation instructions for the
> furnace and there are no specifications for the filters, other than that
> they need to be changed regularly, which is getting pretty expensive.  Is
> there any reason I couldn’t just use 1” filters, which are less than half
> the price?  Maybe even put two of them in the box, a good one first to
> catch most of the dust and a cheap one like the contractor used as a
> secondary one.  It is a snug fit and I don’t think there is any danger of
> them tipping, but two would make it impossible.
>
> Thanks,
> Jim
> _______________________________________________
>
> Shop-talk at autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.96
> Archive: http://www.team.net/pipermail/shop-talk
> http://autox.team.net/archive
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/shop-talk2@mcfetridge.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/shop-talk/attachments/20211213/ea8dac42/attachment.htm>