Taifun hole diameter without chimney?

[scutterflux]

Hello,

I'm looking for a quick answer to the diameter of the hole were the chimney goes in the taifun?

I understand you can get chimneys in 1 mm, 1.2 mm, 1.5 mm inner diameter but what if you remove the chimney completely?

I have one on order and know I prefer around 2 mm.