Air Duct Calculator - Slide Rule

$13.99
by Inc. Builder's Book
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Air Duct Calculator -Slide Rule Style This rectangular air duct calculator is the technicians favorite. Provides the following information with one setting:- Friction- Velocity- Round Duct Size- Surface Area...and more Size: 4" x 8.5". ISBN No. 9781622709823Sturdy construction of heavyweight calculator board with 6 metal eyelets.

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