My contractor left me with 4 cases of filters for a Waterfurnace Legend 070. They look to be two filters taped together. But now they're gone. The specs on page 21 of SC1100AL.pdf : 1 - 20 x 25 [508 x 635] 1 - 20 x 22 [508 x 559] I assume I order a case of 20 x 25 and another of 20 x 22 . But then what ? It doesn't seem there's enough support to put one on top of the other. How do you support them ? sean
