Gas chapter 11 practice exam questions and answers

A room contains two fuel burning appliances. The total btu input of both appliances is 125,000 BTU's. How many cubic feet are required for the room NOT to be considered confined space? - ans-125,000/1000 = +50 6250 What is the maximum length of the flexible gas connector going to a furnace? - ans-6' Given: A 75,000 btu furnace with three burners and a recommended manifold pressure of 3.5 in W.C. What size should the orifices be if the furnace is installed in Salt Lake? - ans-44 When can a category I fan assisted furnace be connected to a masonry chimney? - ans-7 times rule What are the distances listed direct vent appliances must terminate from openings where combustion products can enter a building? - ans- What are the materials that can be used for piping natural gas? - ans- An 80,000 BTUH furnace is supplied with 890 DTU/Cu. Ft. gas. How many cubic feet of gas are required per hour? - ans-80,000/890=89.88 If a building is not of unusually tight construction, what is the minimum volume of unconfined space that will be required for an 80,000 BTU furnace and a 35,000 btu water heater? - ans-(total btu/1000)/50=5750