In Figure 39-24, what controls the fan operation in heating?

What will be an ideal response?


The HFR NO contacts in the furnace ignition control board.

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When grinding valve seats, some machinists will grind the 45-degree angle after the 60-degree angle.

Answer the following statement true (T) or false (F)

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The United States uses which of the following standard systems of wire sizes?

a. Manufacturer’s Gauge b. Manufacturer’s Foundation c. American Wire Gauge d. International Electrotechnical Commission

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Who is the most noted animal handling and facility design expert in contemporary times?

A) Lynn Locatelli B) Temple Grandin C) Curt Pate D) Bernie Rollin

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The amount of water vapor that diffuses through a building assembly is affected by the following factors: the chemical composition of the building materials, the thickness of the building materials, and the ____ on each side of the building assembly.

A. bulk moisture B. ventilation C. absolute humidity D. heat index

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