Can you help me not with a particulate efficiency question, but with a question on resistance efficiency?
The static pressure drop on many electronic units ranges from .18 to .27. In the same range as some of these 4 or 5" thick non-electronic media filters.
How can I think of pressure drop when:
- eg my AHU/DUCT system measures .5 SP no filter in? ( I chose .5 as I read this is a max objective for sp on a system)
- filter sp rating is .25
- filter note says filter at .5
- the AHU operates up to .8 sp
So when filter is new, sp is starts at .5 + .25 = .75.
This looks to me like I only have .05 of static to raise before I have to replace the filter!!
Is it correct to think of this that way? Margin for loading the filter with particulates is way too low?
What am I missing?