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Heat press platen size by design

Enter design width and height in inches. Get a 12x15 / 15x15 / 16x20 platen class or NO_MATCH.

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Worked checks: 10x12 -> 12; 14x14 -> 15; 16x18 -> 20; 18x22 -> NO_MATCH. classLbs uses 12 / 15 / 20 for CTA matching.

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