Name the structure that can be made of any incombustible material, and protects the combustible floor around the fireplace.
What will be an ideal response?
outer hearth
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In the language of GD&T, explain the differences between two planar surfaces being opposed, partially opposed, or non-opposed.
What will be an ideal response?
In heating mode, where is the airflow directed?
A) Dash vents B) Floor C) Windshield D) Both B and C
What type of vent is used with 90% Category IV furnaces?
A) 90% efficiency furnaces do not require a vent B) Type B double wall gas vent C) PVC D) Single wall stainless steel
How many wires are needed for a communicating control system to control a three-stage heat, two-stage cool heat pump?
A) Four wires—two for power and two for communication B) Nine wires—one for each stage plus reversing valve and power C) Five wires—one for each stage heat and cool D) No wires are required because communicating systems are wireless.