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