A Metal Halide, florescent, or specialty bulb may flicker and turn off during the first 100 hours burn in period. A normal house hold bulb may acturally burn filiment off the outside of the glass as well. Let everything cool down and restart.
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It is recommended, where possible,
to use rigid duct. It has less resistance
to air flow and allows the fan to
operate much more efficiently. If
flexible duct is used, be sure the duct
is as straight as possible.