Identify the components of the HVAC system that should be checked at least annually to maintain good performance.
What will be an ideal response?
Among other items, air conditioner refrigerant level and compressor operation should be checked. In furnaces, combustion chambers should be checked for cracks or corrosion, blower motor belts should be checked for wear and bearings should be lubricated if necessary. In all HVAC units the air filters should be checked regularly and replaced as frequently as necessary.
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Using the graph below, if the government required that firms abate a1 units of pollution, this would be ________ because the marginal benefit from additional abatement is ________ than the marginal cost.
Evaluate: (40 × 5) ÷ (4 × 5)
Fill in the blank(s) with the appropriate word(s).
Analyze the frame in Figure P16.5 and draw the shear and moment curves for the members. Neglect axial deformation. EI is constant.
Which method enables ultraviolet (UV) lamps to be able to kill the maximum number of microbes in a duct
system? a. Install UV lamps in the airstream ahead of an EAC. b. Constantly bathe the evaporator coil with UV light. c. Cycle the UV lamps on and off with the furnace blower. d. Install UV lamps in the return air duct airstream.