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a fan box. i classify it as retrofit, though of course they're used when a fan
is installed in
new construction.
old box (1950's) offered knockouts on sides and back, under the clamp.
http://img16.imageshack.us/img16/3841/westinghousefanbox42779me.jpg
new box, with workaround: short twine taped to pull cable into box after box is
recessed
"behind" sheetrock.
http://img11.imageshack.us/img11/1583/backknockoutold42859kj.jpg
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knockouts should be thru back of retrofit fan box
