ACR-205 Homework week 8

Electronic air cleaners generally have ____.

• ionizing sections

• charcoal filters

• pre filters

• All of the above.

A pleated filter ____.

• does not clog up as quickly as a standard filter

• has much more surface area that non-pleated filters

• none

• Both a and b.

One of the most common substances used as an absorber is ____.

• charcoal b

• silica gel

• fiberglass

• foam rubber

Humidification generally relates to the process of causing water to ____ into the air.

• condense

• evaporate

• be ionized

• be filtered

The controller for a humidifier, a humidistat, has an element that is ____-sensitive.

• moisture

• light

• infrared

• temperature

Atomizing humidifiers discharge ____ into the air.

• CO2

• electronic ions

• carbon dioxide

• tiny water droplets

What are the relative humidity limits recommended for residences?

• 20% to 40%.

• 30% to 50%.

• 40% to 60%.

• 50% to 70%.

A fiberglass media air filter contains a dust-holding adhesive that helps prevent particulates from ____.

• migrating downstream

• migrating upstream

• absorbing odors

• releasing spores

Because humidifiers use water, the evaporative surfaces and water reservoir must be cleaned and sanitized regularly to prevent the distribution of ____ by the moving airstream.

• fungi

• bacteria

• algae

• All of the above.

Caution must be used with changing from one air-cleaning filter type to another. If a technician replaces a low-density filter with a high-density filter it is very likely that the airflow will be reduced.

• true

• false