FS and FD Junction boxes. what does "FS" stand for?

Merry Christmas
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As far as I know....

FS = Ferris box standard or shallow

FD = Ferris box deep.

Of course now you can get a plastic FS or FD. :confused:
 
FS and FD Cast Device Boxes:
Single Gang; Malleable Iron, Aluminum
UNILETS? for use with Threaded Rigid Metal Conduit and IMC. FS Box
2.00? Deep, FD Box 2.69? Deep. Furnished with Internal Ground Screw.

I'd say also it's fitting shallow, or deep
 
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