epa filter 95%-HDR

[orland25]

HI FRIENDS;which is the low presion drop accepted for a filter before the change.the it limit,for a filter precisionaire epa filter 95%-HDR TYPE 24-24-12

[jo-hvac]

I think 1.5wc I could be wrong,we change ours at 1.5wc we use AAF if i'm wrong please tell me!

[powerhead]

I was taught to change them once the Initial (new, clean) Pressure Drop has been doubled. After the Initial Pressure Drop doubles the filter loads up very quickly and if you wait too long after this point you will have a completely clogged filter.

Measure the Initial PD or get this info from the filter manufacturer. Mark the I.P.D at the gauge for reference.

[dan sw fl]

Originally posted by orland25
HI FRIENDS;which is the low presion ( sp* pressure) drop accepted for a filter before the change. the it ( * ? ) limit, for a filter precisionaire epa filter 95%- HDR TYPE 24-24-12

What do your System line losses and Fan Curve look like?

http://www.flanderscorp.com/Catalogs/A-122804.pdf
Page 109, INITIAL 2,000 CFM = 1.0"

Will an ADDITIONAL 1" of dP create a lower than acceptable air flow condition?

Did you determine dP s and air flows at start-up?

Do you monitor (i.e. daily { or appropriate innterval }WRITTEN chart ) 95% filter dP and associated air flow?

______ Solution is TOTALLY DEPENDENT on YOUR Specific application.