HVAC Unit 34 Indoor Air Quality Review Questions
ASHRAE Standard _________, "Ventilation for Acceptable Indoor Air Quality," is the standard generally used to determine acceptable indoor air quality.
62-2001 pg 878
Static electricity is much greater in ______ air
A) dry pg 889
Ion generators ______ particles in an area. ABCD
B) charge pg 887
The recommended relative humidity for a home is between: ABCD
D) 40 to 60% pg 889
List five different sources of indoor air pollution.
Moisture Mold Humidifiers Carpets Fireplaces pg 878
What are two substances molds need in order to grow?
Moisture and food. pg 880
Three different biological contaminants are ______, ______, and ______.
Molds, viruses, dust mites pg 880
T or F: Some humidifiers have their own waterheating devices.
True pg 891
Radon is a _______, ______, and ______ gas.
colorless, odorless, radioactive pg 879
Describe the difference between absorption and adsorption.
Absorption - process of one substance being absorbed by another. Adsorption - process of a thin film of the liquid or gas adhering to the surface of a solid substance. pg 885
An electrostatic precipitator is the same as: ABCD
C) electronic air cleaner. pg 887
If radon gas is suspected, what should be done?
Corrective action should be taken to eliminate the source. Procedures for the reduction of the radon gas should be performed by contractors or individuals who have satisfactorily completed the EPA Radon Contractor Proficiency Test. pg 880
The purifier ingrediant in an activated charcoal air purifier may be: ABCD
D) any of the above - activated carbon, coconut shell pellets, manufactured from coal. pg 887
Three methods to control indoor air contamination are ______, ______, and ______.
Eliminate the source of the contamination Provide adequate ventilation Provide a means for cleaning the air. pg 878
Describe the difference between an evaporative and an atomizing humidifier.
Evaporative humidifier - places moisture on a surface called a media and exposing it to dry air. As air is forced through or around the media, moisture is picked up. pg 890 Atomizing humidifier - discharge tiny water droplets into the air, which evaporate very rapidly into the duct airstream or directly into the conditioned space. pg 892
T or F: Carbon monoxide is produced by mixing vapors from nitrogen dioxide and sulfur dioxide.
False, it comes from carbon and oxygen pg 883
Why is it essential for the furnace to be operating when an atomzing humidifier is being used?
If the furnace is not operating, moisture will accumulate and cause corrosion and mildew. pg 892
How does ventilation improve air quality?
It removes some pollutants from the air and dilutes the remaining pollutants with acceptable outside air. pg 884
Three general types of air cleaners are _______, ______, and ______.
Mechanical filter, electronic air cleaners, ion generators, and ultraviolet C light. pg 885
T or F: Fiberglass filter media are generally coated with a special non-drying, nontoxic adhesive on each fiber.
True. pg 886
The relative humidity in heated homes is generally the _____ in the winter season.
lowest pg 889
The plenum-mounted humidifier is installed in the _____ plenum. ABC
supply or return air plenums. pg 890
