Humidification in residences equipped with ducted warm air heating systems:
a. Is not necessary because the humidity does not change with heating
b. Is provided for by placing a single humidifier in the furnace plenum or in the warm air duct
c. Is accomplished by installing a second heating system, such as hot water
d. Is supplied entirely by normal living processes such as cooking, washing, and breathing
e. Requires separate humidifiers for each heated area
Answer: B