Which device is utilized to measure draft in a furnace?

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The correct choice is the manometer, as it is specifically designed to measure pressure differences, including draft pressure in a furnace system. Draft is the difference in air pressure that helps to regulate the airflow within the furnace, which is crucial for efficient combustion.

A manometer typically consists of a U-shaped tube filled with a liquid, usually water or mercury. When there is a difference in pressure between the two sides, the liquid level will change, allowing the operator to calculate the pressure difference and thus the draft. This measurement is essential for ensuring that the furnace operates safely and efficiently.

In contrast, other devices mentioned serve different purposes. A thermometer measures temperature, a barometer measures atmospheric pressure, and an altimeter is used to measure altitude by calculating the pressure of the atmosphere at various heights. None of these devices are suitable for measuring the draft in a furnace, which specifically requires the capability to measure very small differences in pressure, hence making the manometer the appropriate choice.

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