HVAC Filters and How They Work

MT Weatherization Training Center's "HVAC Filters" Webinar Quiz

To gain BPI credit for the webinar, completion of this quiz is required. If you would like for us to submit for credit for you, please remember to provide your BPI number! A 70% or higher is required to receive BPI credits.

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* 1. Address

First and Last Name *

Agency Name *

BPI Number (if applicable)

City/Town *

State/Province *

Email Address *

Phone Number

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* 2. Filters with a high MERV rating are better at filtering what contaminants?

a. Particles from 0.03 to 0.3 microns

b. Particles from 0.3 to 10 microns

c. Bacteria and crypto-sporidium

d. Toxic gasses and vapors

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* 3. Filters with a higher MERV rating have what characteristics?

a. They are cheaper

b. They catch more airborne debris

c. They allow more airflow

d. They don’t need to be changed so often

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* 4. What are some problems that could arise when changing from a MERV 8 to MERV 13 filter?

a. Increased noise

b. Excess heat delivered to rooms

c. Backdrafting of combustion appliances

d. Decreased airflow at rooms

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* 5. What is one advantage of converting from 1” to 2” or 4" filters?

a. 2” or 4" filters are cheaper

b. 2” or 4" filters are easier to find in stores

c. 2” or 4" filters decrease gas pressure

d. 2” or 4" filters clog more slowly

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* 6. What is a reasonable pressure drop across a furnace filter?

a. 2-3 ounces

b. 1.0 IWC

c. 20-30 PSI

d. 0.1 to 0.2 IWC

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* 7. What is the programmed response to decreased fan flow when a furnace fan is driven by an ECM motor?

a. Fan shuts off on thermal overload

b. Controller goes into fault mode

c. Fan reverses direction to clear blockage

d. Fan speed increases

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* 8. With an old-style (non-ECM motor) what happens to current draw when the airflow is reduced?

a. It increases

b. There is no way to know

c. It decreases

d. It stays approximately the same

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* 9. What is one way to maintain airflow while upgrading to a high-MERV filter?

a. Break-in the filter with compressed air

b. Stack two filters on top of one another

c. Reduce the fan speed

d. Increase the area of the filter

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* 10. Why should you care about furnace temperature rise when altering the configuration of filters?

a. Higher temperature rise can decrease consumption

b. High temperature rise can shorten the life of the furnace

c. Low temperature rise can result in freezing in Northern climates

d. Low temperature rise can result in increased emissions

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* 11. What does MERV stand for?

a. Maximum Electrical Resistance Variation

b. Minimum Efficiency Reporting Value

c. Motor Emmisivity Resistance Variation

d. Multi Electric Recall Value

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