Research has shown that the most serious air leaks occur

at the top and bottom of the conditioned envelope.

The U.S. Department of Energy also says that a home's heating and cooling costs can be reduced by as much as 30% by

using proper insulation and air-sealing techniques.

Thermal boundaries consist of

insulation and an air space barrier.

The thermal resistance of the insulation and the surface area of the shell of the house will determine

how much heat is transmitted through the shell.

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HVAC 266 ventilation practice test

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1
When the pressure of the combustion appliance zone (CAZ) is lower than the pressure of the vent system, ________________
perfect combustion will occur.
backdrafting will occur.
condensation will occur.
thermal bypass will occur.
2
Research has shown that the most serious air leaks occur
at the top of the conditioned envelope.
at the top and bottom of the conditioned envelope.
through the HVACR system.
through draft hoods and fire places.
3
The U.S. Department of Energy also says that a home's heating and cooling costs can be reduced by as much as 30% by
using proper insulation and air-sealing techniques.
planting trees and vegetation to shade the property.
performing a combustion analysis on all gas-burning appliances.
replacing the structure's windows.
4
Thermal boundaries consist of
areas where air can infiltrate or exfiltrate.
attics and crawl spaces.
insulation and an air space barrier.
thermal bypasses and intermediate zones.
5
The most popular energy index is the
EPA index.
HERS index.
IECC index.
Energy star.
6
In the Department of Energy climate zones 5, 6, 7, the standard air changes per hour for an Energy Star dwelling is
15
4
10
20
7
A home that is classified as a "net zero" home
has an Energy Star rating of 85.
has an index score of 0.0.
is completely off the grid.
has an index score of 100.0.
8
The thermal resistance of the insulation and the surface area of the shell of the house will determine
the type of heating and cooling equipment that should be installed.
how much heat is transmitted through the shell.
the emittance factor of the windows.
the square footage of the conditioned space being audited.
9
The ignition temperature of natural gas is
700°F to 800°F
500°F to 600°F.
1100°F to 1200°F
1500°F to 1600°F.
10
____% of the total energy losses can often be blamed on air leakage in forced-air duct systems.
25
45
55
35

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