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But I never recommend that this be the only time or criteria for checking/changing filters.While I'm in the new install of controls side of things now, for over 30 years I worked in what is essentially the in-house maintenance/operator side of things.switch how do you calculate the correct differential pressure across the filter to know when hes dirty? Filter types vary but say a perf 2" filter with a max velocity of 500fpm if all was well ie duct size, cfm dilivery.
As guy is gonna have to suddenly break off doing something else, or put something "on hold" so he can take care of the filters. So I tend to favor scheduling in, along with some other routine maintenace/inspection, that guy checks filters. You're the best judge of your installation's needs/requirements. Myself I favor at least a once a month, simple, visual and hearing check of equipment. As well as servicing of whatever else is in the area, a bit of routine cleaning, etc. After all, there will be times when for any number of reasons a particular set of filters barely have any loading at all, and other times when they'll be heavily loaded.
I agree with previous thread that regular inspection of filters would be helpful.
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IMHO, the way I look at this question, I always had two goals.
Detect abnormal condition early before subsequent castastrophic failure occurred.