Aga t2 how big to make air hole? Don't know drill bit sizes

[MesaMitch]

Hey guys going to a machine shop tomorrow to drill out my air hole in my aga t2

What size do I make it for maximum vapor ?

I was thinking of going 1.3 - 1.5 mm
But I don't know what to tell them If they ask me what size in drill bit measurements

Can some one tell me what 1.3 1.4 and 1.5 would be ?

And is 1.5 too much?

Thanks guys!

 

[crxess]

You will only know what is to much for your preference once there. then it is to late.

Some like 1.5mm
Some say it is to airy