Underwriters Laboratories standard 181 B covers:
A) Methods of connecting and sealing ductboard.
B) Methods of connecting and sealing metal duct.
C) Methods of connecting and sealing flexible duct.
D) Methods of connecting and sealing all types of duct.
Question 2
What is a multiposition furnace?
A) It is a furnace that can be used in most any position.
B) It is a furnace that can use multiple types of fuels.
C) It is a vent-free oil furnace that can be installed anywhere.
D) It is a furnace that can be converted to a boiler.