Name the component that changes electric power from high Voltage to lower Voltage.

Explain $4$ tasks and how you could use a Magnehelic Gauge for them.

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$21.$ Why must a series of velocity pressure readings be made on ducts prior to providing a traverse complete reading:

$22.$ I need to verify the CFM in an air handler that has electric heat. Using the temperature rise method, how do I do this? Explain in detail. $q,$ x $q,1\mathrm{.}08$ X $q,$ T

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aed $$ea$.$ noces.

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I need to verify the airflow from a $22$ ceiling diffuser. What tool do I use? $-$

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