How does venting compare on 80 percent and 90 percent efficient heating units?
A) 90% furnace vents are 10% larger in size than 80% furnace vents
B) 80% units require outside air to be piped in for combustion and 90% do not
C) 80% furnaces use PVC vent and 90% furnaces use type B gas vent and
D) 80% furnaces use type B vent and 90% furnaces use PVC pipe for venting material
D
You might also like to view...
Variable capacitance-type sensors are often used to measure temperature values.
Answer the following statement true (T) or false (F)
The color bands blue, gray, brown, gold describe which one of these resistors?
A) 680 ? ±5% B) 68 ? ±5% C) 680 ? ±10% D) 68 ? ±10%
The construction document set consists of
A) construction drawings and specifications. B) construction drawings. C) construction drawings and construction schedule. D) construction drawings, construction schedule, and specifications. E) construction drawings, construction schedule, and owner-contractor agreement.
A single diode can be connected as a full wave rectifier.
Answer the following statement true (T) or false (F)