opens from the left
Basically there are two things to look at to see if the door can be reversed. First is to look if the door is lighted or has a munion heater. Not reversible if it does. Second is to look at the door post on the side that opens to see if it has Tap holes for the hinges to be moved. They are usually covered or plugged. If it does, check the hinge design and bolt pattern to match in case it requires opposite hinges. I believe that master built has spring loaded bottom hinge and can not be flipped. But designs change from year to year.
I found the manual for the Master-Bilt MBGR24H here: http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/MB-MBGR24H_iom.pdf
Unfortunately there is nothing in the documentation to suggest a reversible door for the MBGR24H.
I also checked sales documentation online which did mention features like reversible doors on later Master-Bilt models.
To be 100% certain, I recommend calling Master-Bilt directly at 800-647-1284
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