Gas burners for heating boilers can be divided into two general classes:
a. Mixing and non-mixing
b. Refractory and ribbon-type
c. In-shot and up-shot
d. Pre and after mix
e. Atmospheric and fan-assist
Answer: D
Gas burners for heating boilers can be divided into two general classes:
a. Mixing and non-mixing
b. Refractory and ribbon-type
c. In-shot and up-shot
d. Pre and after mix
e. Atmospheric and fan-assist
Answer: D