how to make hvac ductwork

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How to Make HVAC DuctsPlace a 4 foot by 8 fo …Lay the steel ruler on …Align the end of the r …Slide the ruler away f …Slide the ruler until …Slide the ruler until …Slide the ruler until …Use the last marks to …Open the clamp mechani …Bend the metal at 90 …更多结果…

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