Refer to table 22D at the end of this practice test. A furnace rated at 120,000 Btu/hr is to be installed 50` from a gas meter. Given: gas at an 11″ WC, .6 spec. gravity, .5 pres. drop, & 1000 btu per cf. What is the size of the supply line to the furnace?

Refer to table 22D at the end of this practice test. A furnace rated at 120,000 Btu/hr is to be installed 50` from a gas meter. Given: gas at an 11″ WC, .6 spec. gravity, .5 pres. drop, & 1000 btu per cf. What is the size of the supply line to the furnace?