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I don't know if the calculations "require" a tube around the window disks,
but it seems like a bad idea to NOT have one. Having the disk inside a tube
gives you more room for "pookie" to seal against the disk, plus it protects the
disk from side impact. My big window has a 2 inch wide flange for the disk to
sit on, plus a three inch deep tube surrounding the disk. That makes
5 inches of sika-flex the water has to get through to enter the sub. Probably
won't be possible to remove the disk un-damaged if I need to later though.
Frank D.
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