Study Guide 34
What are the relative humidity limits recommended for residences?
40% to 60%
The American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) has guidelines governing indoor air quality. These guidelines are called ASHRAE Standard _____.
62-2001
A high density fiberglass filter media air filter will catch and retain _____% of the particles in the air.
70%
Electronic air cleaners generally have _____.
A pre-filters
How does adding humidity to the air in a residence affect the thermostat setting?
By raising the relative humidity in the air, a person is more comfortable at a lower thermostat setting.
Air in homes tends to be drier in the winter. Why?
Cold outside air from infiltrates the conditioned space.
A house is built on property whose soil is rich in uranium. The occupants of the house may _____.
be subjected to radon gas
When odor is a concern, a filter containing _____ should be used.
charcoal
Describe an atomizing humidifier.
A type of humidifier that discharges tiny water droplets mist into the air that evaporate rapidly to raise the humidity of the air.
Why are humidifiers usually installed in the supply duct of a gas-fired forced air heating system?
Hot air has lower humidity and it will natural accept the water vapor
What is the major objection to an atomizing type humidifier?
Minerals in water
If reservoir-type humidifiers are not properly maintained, which of the following can be discharged into the air?
Mold (all sorts of stuff)
Why should humidifiers be cleaned on a regular basis?
Prevent biological contaminants, buildup of mold and bacteria.
Environmental tabacco smoke (ETS) is more commonly known as _____.
Second hand smoke
Why are high efficiency particulate arrestor (HEPA) filters desirable?
They filter minute particles that can contain mold, dust mites, bacteria and pollen.
One of the most common substances that is used as an absorber is _____.
charcoal
The steps to aggressively controlling the contamination of indoor air would involve _____.
eliminate or minimize the source of contamination before trying something mechanically
Humidification generally relates to the process of causing water to _____ into the air.
evaporate
Atomizing humidifiers discharge _____ into the air.
mist
The controller for a humidifier, a humidistat, has a power element that is _____ sensitive.
moisture
Deep extended surface air filters are up to three times more efficient than regular air filters because the filter media used is _____.
pleated
The two types of atomizing humidifiers are the _____ and _____.
spray-nozzle; centrifugal
