Spoke to Apeks today. Apparently the current practice is NOT to install both the conical filter and the disc filter together.
For DIN applications, the conical filter should be used. For yoke apps, the disc filter should be used. However for a yoke config that is used with EANx, they recommend the conical filter be used.
Some of their US csutomers requested a 'filter guard' for yoke configs - as the lack of the disc filter was felt to be 'unsightly'. This is only in US service kits apparently.
So, now Im stuck with both filters installed. Apeks said that this could cause too much breathing resistance (though it tested, and feels fine..). I do use EANx from time to time, and I can't remove the disc filter without dissasembling the 1st stage (I think).
For DIN applications, the conical filter should be used. For yoke apps, the disc filter should be used. However for a yoke config that is used with EANx, they recommend the conical filter be used.
Some of their US csutomers requested a 'filter guard' for yoke configs - as the lack of the disc filter was felt to be 'unsightly'. This is only in US service kits apparently.
So, now Im stuck with both filters installed. Apeks said that this could cause too much breathing resistance (though it tested, and feels fine..). I do use EANx from time to time, and I can't remove the disc filter without dissasembling the 1st stage (I think).