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Pete C.

wrote:

On Fri, 24 Aug 2007 12:41:03 -0700, wrote:

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).

How's about 'change it when it's ****ing dirty' ?

This will require ****ING LOOKING AT IT once in a while, and
making a DECISION.

Yes, looking at the filter periodically is a good idea. I've seen cheap
filters that failed and periodic inspection would catch that and limit
the damage.

Beyond that, there are a few air filter monitors available that monitor
airflow or pressure and indicate when a filter should be changed similar
to the indicators on most truck air filters these days.