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1. What is a multi-axis baffle? A multi-axis baffle refers to a baffle that has several blades, with each axis located at the center of its respective blade and connected by a rod system, allowing all these axes to rotate simultaneously. 2. What is a thermal insulation nail? Thermal insulation nails are sometimes referred to as backing fasteners. It is a component made of metal or refractory materials, used as a fixed refractory and insulating material. 3. What is an expanded surface? An expanded surface refers to the part of the surface on the outer side of a convective tube where protrusions or fins are added to increase the heat absorption area and thereby boost the amount of heat absorbed. 4. What is the expanded surface ratio? The expanded surface ratio refers to the ratio of the total exposed area to the external surface area of the light tube. 5. What is primary air? Primary air refers to the portion of air in the total combustion air that mixes with the fuel first. 6. What is secondary air? Secondary air refers to the additional air supplied to the fuel in order to compensate for the deficiency of primary air. 7. What is chimney temperature? Chimney temperature refers to the temperature of the flue gas as it exits the convection chamber. 8. What is firewall temperature? Firewall temperature (also known as furnace temperature) refers to the temperature of the flue gas as it exits the radiation chamber. 9. What is the hot surface temperature? The hot surface temperature refers to the temperature of the exposed surface of the refractory or insulating material that is in contact with flue gas or hot combustion air. This temperature is used to determine the thickness of fire-resistant or insulating materials as well as the heat dissipation rate. 10. What is coil pressure drop? Coil pressure drop refers to the difference in pressure between the inlet and outlet ends of the coil, including the static head.