Heating I Section#1 Furnace - Gas and Oil Quiz#7

This study session deals with duct systems, registers and grilles.

The estimated completion time for this study session is sixty minutes.

Objectives
At the end of this study session, you should be able to:

• List eight components of the duct system in a forced air system.
• List twelve problems with duct systems.

List 3 factors that cause friction loss in duct systems.

1. Duct size
2. Elbows
3. High velocity
4. Duct shape
5. Length of duct.

List 6 conditions found with duct systems.

1. Disconnected
2. Dirty
3. Removed during renovations
4. Obstructed or crushed
5. Leakage
6. Wires or pipes in ducts
7. No air or weak air flow
8. Rust
9. Uninsulated ducts
10. Registers or grilles in garages
11. Poor location
12. Too few return grilles
13. Registers obstructed
14. Painted shut or damaged.

Starting at the supply plenum, list the components of the duct system which the air travels through to deliver heat to the room, and as the air re-enters the furnace at the return site.

The heated air is pushed through the supply plenum, along the supply ducts, out the registers into the room. The air travels across the room from supply register to return grill, through the return ducts to the return plenum, where it re-enters the furnace to be reheated.

Why is it unsafe to have a supply register supplying heat to a garage?

Exhaust fumes can enter the house when the furnace is not running.

In a heating-only climate, an uninsulated duct running through a cold space will deliver _____ air to room at the end of the duct.

Cool

The vapor barrier on an insulated duct in an uninsulated space in a heating-only climate should be:

On the side of the insulation closest to the duct

Wiring or plumbing pipes in return ducts are:

Acceptable

Wiring or plumbing pipes in supply ducts are:

Unacceptable

A return grill allows us to modulate the air flow.

False