I've received a response!
Now that I can see the pictures and the dates/ where they're made, it looks like the
"fluted" filter was made in 2010 and the smooth dome end filter was made in 2013.
(the first five digits of the date code represent yr/day ex: 10- 2010, and 061- 61st
day of year) There may have been a design change between the two dates, but I don't
have access to see when all the changes to the filters are made unfortunately.
Regardless, the "fluted" filter is past it's shelf life of 4 years. Like I said in
my previous email, that filter is supposed to have a smooth dome end according to
the engineering drawing of the filter. If your supplier is selling you these out of
date filters I would take/send them back. We do have filter plants in both the U.S.
and Mexico, so I'm not going to say these are counterfeit, but I will look into the
issue. You need to use the smooth dome filter though and again, if you have any of
the "fluted" filters they are likely out of date. If you have any more questions/
concerns please let me know.
Now that I can see the pictures and the dates/ where they're made, it looks like the
"fluted" filter was made in 2010 and the smooth dome end filter was made in 2013.
(the first five digits of the date code represent yr/day ex: 10- 2010, and 061- 61st
day of year) There may have been a design change between the two dates, but I don't
have access to see when all the changes to the filters are made unfortunately.
Regardless, the "fluted" filter is past it's shelf life of 4 years. Like I said in
my previous email, that filter is supposed to have a smooth dome end according to
the engineering drawing of the filter. If your supplier is selling you these out of
date filters I would take/send them back. We do have filter plants in both the U.S.
and Mexico, so I'm not going to say these are counterfeit, but I will look into the
issue. You need to use the smooth dome filter though and again, if you have any of
the "fluted" filters they are likely out of date. If you have any more questions/
concerns please let me know.