NATE Gas Heat Practice Guide questions with correct answers

What precautions are required when mounting any gas furnace on a wood platform in an attic? CORRECT ANSWER None The gas control valve may be damaged if exposed to an inlet pressure above what? CORRECT ANSWER 14 inch W.C. How many elbows and joints should a vent connector have? CORRECT ANSWER As few as possible to reduce resistance of flue gases. Under what conditions, if any may the technician route the exhaust of the furnace into the exhaust vent of the water heater: CORRECT ANSWER Under no conditions may you use the water heater exhaust vent. How may a technician terminate the intake and exhaust for proper operation of a high efficiency gas furnace when using scheduled 40 PVC pipe: CORRECT ANSWER By using the specific manufacturers termination kit or make one to meet their requirements. When suspended with metal strap and no saddle, flexible duct should be: CORRECT ANSWER supported with a minimum strap width of 1/2". A technician is installing a gas furnace and the customer has decided not to install an air conditioner. Making this decision, the affect it will have on the installation of the supply ductwork is: CORRECT ANSWER Leave adequate space should be allowed for addition of a coil in the future when feasible. Leveling of a Mercury bulb is __________ CORRECT ANSWER Critical Spray-type atomizing humidifiers are installed to do what? CORRECT ANSWER Discharge moisture into the supply duct.