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Advised gap for lidless racking?

377 views 3 replies 3 participants last post by  harlequin 
#1 ·
Im building some lidless wooden racking for 18ltr RUB's and I was wondering what kind of gap everyone else leaves between the top of RUB and next shelf?
I don't want it so tight its hard to move but not so big a baby boa could escape!
Will have heat mats under so will be less than 1mm lift from heating :)

Thanks!
 
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