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Calculate the required airflow in cubic feet per minute of a…

Calculate the required airflow in cubic feet per minute of an electric furnace that draws 60 amps at 240 volts. The measured temperature rise is 45 degrees F (Refrig. text page 813)

Published February 19, 2026
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A branch take off fitting shall not be installed closer than…

A branch take off fitting shall not be installed closer than 18 inches from a trunk end plate.(Manual D sec. 5)

Published February 19, 2026
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A thermistor start assist kit is used on:

A thermistor start assist kit is used on:

Published February 19, 2026
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The typical shut down sequence for a direct ignition burner…

The typical shut down sequence for a direct ignition burner system using a furnace control board is::

Published February 19, 2026
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On a 230 volt system the voltage from one leg to ground shou…

On a 230 volt system the voltage from one leg to ground should be

Published February 19, 2026
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As the secondary air is decreased, the percentage of carbon…

As the secondary air is decreased, the percentage of carbon dioxide in the flue gases increases, and the chance of producing carbon monoxide becomes greater.

Published February 19, 2026
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Unit and wall heaters are typically mounted on the ceiling o…

Unit and wall heaters are typically mounted on the ceiling or wall and use a fan to distribute the heat by forced convection. They are controlled by a low volt thermostat.

Published February 19, 2026
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In a capacitor start-Induction run motor a capacitor is plac…

In a capacitor start-Induction run motor a capacitor is placed in ______ with the centrifugal switch and the start winding

Published February 19, 2026
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In a series or parallel circuit, you can find the total powe…

In a series or parallel circuit, you can find the total power by adding the power produced through each resistance.

Published February 19, 2026
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The outside summer design conditions listed in the Manual J…

The outside summer design conditions listed in the Manual J Table 1 are based on ASHRAE weather data. This means that only ______ percent of the time the outdoor temperature will exceed the summer design temperature.

Published February 19, 2026
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