Which of the following is not a gas-fired infrared heater?
a. Surface combustion heater
b. Low temperature catalytic heater
c. Quartz tube heater
d. Vented heater
e. Directly fired
Answer: C
Which of the following is not a gas-fired infrared heater?
a. Surface combustion heater
b. Low temperature catalytic heater
c. Quartz tube heater
d. Vented heater
e. Directly fired
Answer: C