Exfiltration air leaving the building as replacement air is an example of replacement air for combustion from inside. Which option shows this?

Exfiltration air leaving the building as replacement air is an example of replacement air for combustion from inside. Which option shows this?

• A. Exfiltration air leaving the building
• B. Infiltration air from outside
• C. Air from the kitchen area
• D. Filtered air from inside

Answer: (A)

Replacement air for combustion is the air that must be supplied to a space where combustion is occurring, and the direction of air movement matters. Exfiltration describes interior air moving from inside the building to the outside. This interior air is the air that might be consumed or displaced by combustion inside the building, so its movement outward represents the interior air involved in the replacement process. Therefore, the option describing air leaving the building aligns with replacement air coming from inside. Infiltration would be outside air entering the space, which is replacement air from outside rather than inside. Air from the kitchen area isn’t a defined replacement-air source, and filtered air from inside implies recirculated air rather than air moving out to replace consumed interior air.

Replacement air for combustion is the air that must be supplied to a space where combustion is occurring, and the direction of air movement matters. Exfiltration describes interior air moving from inside the building to the outside. This interior air is the air that might be consumed or displaced by combustion inside the building, so its movement outward represents the interior air involved in the replacement process. Therefore, the option describing air leaving the building aligns with replacement air coming from inside.

Infiltration would be outside air entering the space, which is replacement air from outside rather than inside. Air from the kitchen area isn’t a defined replacement-air source, and filtered air from inside implies recirculated air rather than air moving out to replace consumed interior air.