When a home air filter manufacturer recommends a filter change every
90 days, what duty cycle do they assume the filter wil be used?
1 hour per day?
10 hours per day?
24 hours per day?
I think they should list filter change recommendations in hours (e.g.
filter good for 300 hours of use).
(Some thermostats like my LUX have filter-life counters that show the
number of hours the filter was used since it was last changed).
You need to change it every 90 days, unless it needs to be changed sooner,
or operating conditions result in you being able to change it less
You should be able to call LUX and ask them how many hours you can go
between filter changes. After all, they put the hour meter in there, so they
should be able to tell you how to use it. But then, they don't make filters,
so their guess is as good as..... If they give any answer, and don't just
hang up on you. At least one of the manuals they have online gives their
theory as to how many hours = 90 days, and it's not any of the guesses that
you've made. So, my first answer is likely to be the most correct answer.
If you don't like these answers, you'll need a new thermostat.
By the way looking at it really doesn't tell you the condition if you have
an electrostatic filter. According to Filtrete the electronstatic fibers
loose their ability to atttrack the smallest particles before the filter is
Based on EU-2 rated filter media with an area of 01121 square meter
and a face velocity of 2 m/s a pressure drop across the filter of 25 Pa
would indicate a clean filter.
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These ratings are (I'm guessing) the result of internal standards
used by the manufacturer and are mainly designed to allow comparison
between their products and for advertising (you are more likely to
purchase a filter that needs changed less often, even if more
In practice (as the owner of t dogs, 4 cats and 2 kids) I find that
every week the filter needs a good vacuuming and every month it
needs replacing - irregardless of what the package says. Point is
you need to determine what is normal for your situation and stick
I purchase the higher quality filters that claim to reduce allergens.
They are considerably more expensive (about 12 bucks) but do seem
to reduce dust in the house. Ironically the 'better' filters
would need changing more often.
Note that there are available reusable filters that you can hose
off once a month.
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