Maintenance Tips & Tricks – 1999 – # 18

By Plant Engineering Staff September 1, 1999

Checking rotation

Problem : You have installed a new ventilation blower and forgotten to check it for rotation. You can’t easily get visual access.

Solution : Don’t hold a strip of tissue near the duct outlet. You’ll be misled because a centrifugal blower moves air in the forward direction even when it’s rotating backwards. Instead, use your clamp-on ammeter. A blower turning the wrong way draws only a fraction of its rated current.

Contributor : Martin Green, Benchmark Testware, Winnipeg, MB; 204-774-4932

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