HERS - Certified Home Energy Rating System Rater Blower Door & Duct Testing Questions and Answers

Question 1

A HERS Rater is performing a blower door test on a 2,500 sq ft house with 8-foot ceilings.
The final reading on the manometer is 1,800 CFM50.
What is the approximate Air Changes per Hour at 50 Pascals (ACH50)?

Accepted Answer

5.40 ACH50

Answer

4.82 ACH50

Answer

6.00 ACH50

Answer

7.20 ACH50

Question 2

According to ANSI/RESNET/ICC 380, what is the standard pressure difference that must be induced across the building envelope for a single-point blower door test?

Accepted Answer

50 Pascals

Answer

25 Pascals

Answer

75 Pascals

Answer

100 Pascals

Question 3

When performing a duct leakage to outside test, what is the primary function of the blower door?

Accepted Answer

To pressurize or depressurize the house to the same pressure as the duct system (typically 25 Pa).

Answer

To pressurize the duct system to 50 Pa while the duct tester measures leakage.

Answer

To create a neutral pressure plane between the house and the outdoors.

Answer

To measure the total building envelope leakage simultaneously with the duct leakage.

Question 4

A HERS Rater is preparing a home for a blower door test according to RESNET standards. Which of the following should be done to prepare the house?

Accepted Answer

Close and latch exterior windows and doors, but do not apply extra sealing.

Answer

Seal all HVAC supply and return registers with tape.

Answer

Turn off the water heater and seal its flue vent.

Answer

Close all interior doors to isolate each room.

Question 5

Which of the following scenarios describes a 'Total Duct Leakage' test?

Accepted Answer

A test that measures all the air leaking from the duct system, regardless of whether it leaks into conditioned or unconditioned space.

Answer

A test using both a blower door and a duct tester to measure leaks to the attic and crawlspace.

Answer

A test performed at the rough-in stage before drywall is installed.

Answer

A test where the duct system is pressurized to 50 Pa and compared against the building's CFM50 value.

Question 6

When performing a duct leakage test in accordance with ANSI/RESNET/ICC 380, the duct system is typically pressurized or depressurized to what pressure differential relative to the surrounding space?

Accepted Answer

25 Pa

Answer

50 Pa

Answer

75 Pa

Answer

10 Pa

A HERS Rater is performing a blower door test on a 2,500 sq ft house with 8-foot ceilings.The final reading on the manometer is 1,800 CFM50.What is the approximate Air Changes per Hour at 50 Pascals (ACH50)?

A HERS Rater is performing a blower door test on a 2,500 sq ft house with 8-foot ceilings.
The final reading on the manometer is 1,800 CFM50.
What is the approximate Air Changes per Hour at 50 Pascals (ACH50)?