I have a Rackbrute 6U. In facts, it has 89hp by row (instead of 88). The power unit takes 5 hp.
-- ClaudeP

You’re right. But, please, that little extra hp in each row (one up and one down) must remain a secret! And it could have been a nice surprise for @davidkcolman, especially for his modules... You shouldn't try to fill those 2 small spaces: they allow for better ventilation. I have three RackBrute 6U. They are beautiful and smart :)

'On ne devrait jamais quitter Montauban' (Fernand Naudin).
https://soundcloud.com/petrus-major/tracks