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Evaporative humidifiers → work on the principle of providing moisture on a surface and exposing it to dry air
True False
an electrostatic precipitator is the same as → an electronic air cleaner
True False
list 5 different sources of indoor air pollution → moisture,mold,pressed wood furniture,humidifier,moth repellents,dry-cleaned goods,house dust mites,carpets,drapes,fireplace, and house hold chemicals
True False
Environmental tabacco smoke (ETS) is more commonly known as _____. → Second hand smoke
True False
Air in homes tends to be drier in the winter. Why? → Cold outside air from infiltrates the conditioned space.
True False
Radon is a ___,___& ____ gas → discharge tiny water droplets into the air
True False
three general types of air cleaners are → Molds,mildew,bacteria ( also dust mites)
True False
why is it essential for the furnace to be operating when an atomizing humidifier is being used → Minerals in water
True False
One of the most common substances that is used as an absorber is _____. → spray-nozzle; centrifugal
True False
the recommended relative humidity in heated homes is between → 40% and 60%
True False
The controller for a humidifier, a humidistat, has a power element that is _____ sensitive. → spray-nozzle; centrifugal
True False
Atomizing Humidifiers → work on the principle of providing moisture on a surface and exposing it to dry air
True False
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.
True False
the purifier ingredient in an activated charcoal air purifier may be → activated carbon,coconut shell pellets,manufactured from coal.
True False
ion generators_____particles in the area → mechanical filters;electronic air cleaners;ion generators
True False
What is the major objection to an atomizing type humidifier? → A type of humidifier that discharges tiny water droplets into the air that evaporate rapidly to raise the humidity of the air.
True False
the plenum-mounted humidifier is installed in the ____plenum → supply or return
True False
What are the relative humidity limits recommended for residences? → 40% and 60%
True False
Two substances mold needs to grow → discharge tiny water droplets into the air
True False
Humidification generally relates to the process of causing water to _____ into the air. → tiny water droplets
True False
The American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) has guidelines governing indoor air quality. These guidelines are called ASHRAE Standard _____. → eliminate the sources of contamination. provide adequate ventilation. provide means for cleaning the air.
True False
When odor is a concern, a filter containing _____ should be used. → charcoal
True False
Describe an atomizing humidifier. → discharge tiny water droplets into the air
True False
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
True False
A house is built on property whose soil is rich in uranium. The occupants of the house may _____. → Cold outside air from infiltrates the conditioned space.
True False
Atomizing humidifiers discharge _____ into the air. → tiny water droplets
True False
Why are high efficiency particulate arrestor (HEPA) filters desirable? → Cold outside air from infiltrates the conditioned space.
True False
three methods to control indoor air contamination are → eliminate the sources of contamination. provide adequate ventilation. provide means for cleaning the air.
True False
Three different biological contaminants are → Molds,mildew,bacteria ( also dust mites)
True False
The two types of atomizing humidifiers are the _____ and _____. → spray-nozzle; centrifugal
True False
If reservoir-type humidifiers are not properly maintained, which of the following can be discharged into the air? → Mold (all sorts of stuff)
True False
Deep extended surface air filters are up to three times more efficient than regular air filters because the filter media used is _____. → Non woven cotton
True False
the relative humidity in heated homes is generally the ____ in the winter system → 40% and 60%
True False
Electronic air cleaners generally have _____. → an electronic air cleaner
True False
A high density fiberglass filter media air filter will catch and retain _____% of the particles in the air. → 70%
True False
describe the difference between absorption and adsorption →
AB-sorption is the proces of one substance being absorbed by another.
AD-sorption is the process of a thin film of liquid or gas adhering to the surface of a solid substance.
True False
Why should humidifiers be cleaned on a regular basis? → tiny water droplets
True False
The steps to aggressively controlling the contamination of indoor air would involve _____. → eliminate or minimize the source of contamination before trying something mechanically
