Air and Air Sealing

Question 1

Infiltration

Answer 1

the unintentional leakage of outside air into a house, measured as cubic feet per minute, or CFM

Question 2

Air Exchange Rate

Answer 2

number of times the interior volume of air changes over in one hour (air changes per hour) or ACH

Must know the infiltration first

ACH = CFM x 60 / volume

Question 3

Exfiltration

Answer 3

Air unintentionally flows out of the house, when the pressure inside is higher than the pressure outside (positive pressure)

Question 4

Velocity

Answer 4

How fast the air is moving inside to outside or visa versa. Measured in CFM

Question 5

Air Pressure

Answer 5

Measured in Pascals

DeltaP

Air moves from higher pressure to lower pressure

Question 6

Airflow

Answer 6

Air movement

Question 7

Pressure Boundary

Answer 7

Where we need to stop the airflow in a home. Same place as the thermal boundaryp

Question 8

Stack Effect

Answer 8

Air movement also known as the chimney effect - driven by buoyancy force. the greater the density difference, and the higher the structure, the greater the buoyancy force.

Question 9

Wind effect

Answer 9

is the preassure related effect of wind on a hohse. Air leaks in the envelope allow air to infiltrate, and that in turn pushes air already inside, out.

Question 10

Mechanical Effect

Answer 10

air movement resulting from mechanical systems such as HVAC, Ventilation, or dyer exhaust

Question 11

Air Barrier

Answer 11

a material used for controlling air flow

Question 12

ACH

Answer 12

Air changes per hour

Question 13

Air Sealing

Answer 13

the practice of installing appropriate materials to stop airflow in certain areas of the home.