Anyone know outter diameter of 18" Fi BL WITHOUT rubber gasket

[46panel 10+ year member]

I would look for myself but don't want to deal with pulling it off because it is installed in a flush mount and would be a pain to take off at the moment. I know with the gasket it is 18.5" but I am thinking of going with a different design for 4 of them and space is VERY tight and every inch is important so I need to know if I take the gasket off, if I will lose the little bit of space I need.

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[46panel 10+ year member]

Ha nvm I fail. Just remembered I had another BL basket and cone in the house I was able to check. And diameter does go down a little bit. Just a little over 18" now. If I don't get rid of the 4 soon might be attempting to wall them off!