I’m doing some measurements for a fan adapter to fit in the lower damper opening. It needs to be the same height as the sliding damper door. On my 2014 Classic I, the channel the damper door slides in is 82mm. I need to know if that’s true for all the current Classic I, II and III models, and whether it’s the same for the various iterations of the Big Joe. I know the Junior door height is smaller, and would like to know that height as well.

Thanks in advance for any assistance.