distance between flush clips

A handy person from Rhode Island says:
December 11, 2013
I have a wooden storm door ( 36 X 92 in) with a wooden framed insert panel. Into this insert panel sits an insert panel of plexiglass with an aluminum frame. (I have another one with screening for summer.) Swisco flush clips (with threaded rivnuts and thumbscrews) are the best solution for me.

My question: The panel dimensions are 24 x 53 inches. At what distance/ how many flush clips should I install?

Thank you.
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Dave Sr. from SWISCO responded:
December 12, 2013
We recommend using 2 on the top and bottom and 4 (or even 6) on each side. As for the distance between them, it's really up to you. I usually put them 12" to 16" apart.
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