Although I love the "natural" filter that occurs when the top is off, up here in Alberta that is at best, a 4-5 month option I drive off-road for work and every km is either mud/gravel slinging or a dust bomb. As a result of the visible dust coming through the vents I thought I would do a custom upgrade to the 2011+ cabin filter. So I started measuring and pondering how do I fit something in there that would work. Well after lots of patience from the NAPA guy opening boxes of cabin air filters for me. I came across one that I thought had close to the right measurements. So 18$ investment and a little luck I trimmed exactly 3 3/4 inches off a Ford windstar cabin filter and low and behold I snuck it in there and it fit like a glove! Unbelievable. The Napa part number is Envirosheild 4807. I will try an upload the photo's.
It will be interesting to see how it looks in 6 months.
Just thought I would share this with the 07-10 owners.

Runamuk

 

Looking forward to it, thanks.

 

One is the filter in place and the second one is with the filter in and recirc door closed.

 

so what you're saying is that there is no oem filter available for the 2011+?? or is it because the oem is mediocre? I'm replacing mine with my next oil change and haven't done my research yet..

 

No I was being cheeky...the 2007 to 2010 models do not have a cabin filter, however the 11 and 12's do to my understanding.

 

What did the final dimensions end up being for the filter?

 

Obtained from: NAPA AUTO PARTS

Part Number: FIL 4807

Product Line: NAPA Gold Filters

Attributes:
Air Filter Height (Inches) : .984"
Air Filter Length (Inches) : 11.496"
Air Filter Style : Air Panel Filter
Air Filter Width (Inches) : 5.236"

 

Thanks, like the idea. Where exactly is it installed?

 

Mine I cut from a $5 HVAC filter I bought at Lowes. Enough material to make 8 cab filters.