Residential HVAC Installation Practice Exam 2025 - Free HVAC Practice Questions and Study Guide

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How can the net wall area be mathematically expressed?

Net Wall Area = Gross Wall Area - Window Area

Net Wall Area = Gross Wall Area - Door Area

Net Wall Area = Gross Wall Area - Area of other components

Net Wall Area = Gross Wall Area - Door Area - Window Area - Area of other components

The correct answer is D because the net wall area is calculated by subtracting the door area, window area, and the area of any other components from the gross wall area. This calculation gives a more accurate representation of the actual wall area that requires heating or cooling.

Option A is incorrect because it only considers subtracting the window area from the gross wall area, omitting the door area and other components which also impact the net wall area.

Option B is incorrect as it only accounts for the door area being subtracted from the gross wall area, neglecting the window area and other components that should also be considered.

Option C is incorrect because it simplifies the calculation by subtracting the area of other components from the gross wall area without accounting for both window and door areas, which are essential in determining the net wall area.

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