Check how thick the filter is with most roughly 1 inch thick.
Furnace filter pressure drop comparison.
On my next filter change i m going to repeat the experiment with merv 8 and 11 and see if there s a difference but my initial impression is that mpr is bs.
The fiberglass filters have a 0 10 to a 0 13 drop going from 300 fpm to 500 fpm across the filter.
Chart of filter pressure drop for filters with merv ratings from 2 to 13.
I tried it a couple times.
But most people seem to have had no.
Merv fpr and mrp.
Furnace filters are replaced by measuring the width by the length.
For this there are three primary codes.
We test 20 filters for pressure drop and efficiency.
So a filter that measure 20 inches long by 25 inches wide would be replaced by a 20 x 25 filter.
David springer home energy magazine article nov.
Funny just ran across this test below comparison of different filters and it doesn t look good for any but the 1 simple fiberglass filters.
This one begins a series testing various furnace filters for their pressure drop when used in a real furnace.
Nordic pure reports the filter s pressure drop as 0 24 inch which puts it a shade higher than the similar merv 12 equivalent filtrete 1500 at 0 22 inch.
Buy a replacement that matches your filter size.
Tested the pressure drop across it pulled it out and replaced it with an mpr 1100 or whatever they say mercy 8 is equivalent to.
Even though filter tests are standardized it is not unusual for the same type of filter to be tested in two different laboratories with two different results.
It is often very difficult to compare pressure drop for hvac air filters.
In simple terms manufacturers of furnace filters perform testing to assess how well the filters block out or trap air.
2009 they tested all the filters at the same width and height 16 x 25 but the depth varied.
And speaking of filter pressure drop here s their chart for filters with merv ratings from 2 to 13.
All the others pleated start from around 0 20 on up at 300 fpm.
