Rio 180 Door Size

[python59]

Hi all can anybody tell me the door opening size on a juwel rio 300
as i am thinking of upgrading from a rio 180 and need the max size of filter i can use in the door opining
i have a fx5 on my trigon 350 but think it will be to big
thanks

 

[python59]

so no replys to my post
so maybe i will just get a tetratec 1200 as i now this will fit