The maximum dimensions of doors for Twin 60 and Jason recommended by the manufacturer Coburn is a guideline only. According to Coburn’s technical department, it was laid down by the original designer of the system and any evidence & reasoning for them has been lost to time. The weight is by far the most important measurement of the door. If your doors are MDF then, at 2120 x 560 x 18mm, your doors should weigh approximately 17 kg each.
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