What is the maximum allowed temperature differential between makeup air and the conditioned space?

What is the maximum allowed temperature differential between makeup air and the conditioned space?

• A. 8 °F
• B. 10 °F
• C. 12 °F
• D. 15 °F

Answer: (B)

When makeup air is introduced to replace exhausted air, its temperature should be close to the space’s conditioned temperature. Keeping the difference to no more than 10 °F helps avoid uncomfortable drafts and reduces the extra heating or cooling the system must do to bring that incoming air to the room temperature. For example, if the space is 75 °F, makeup air should be roughly between 65 °F and 85 °F. Larger differentials would increase energy use and comfort issues, so the maximum allowed differential is 10 °F.

When makeup air is introduced to replace exhausted air, its temperature should be close to the space’s conditioned temperature. Keeping the difference to no more than 10 °F helps avoid uncomfortable drafts and reduces the extra heating or cooling the system must do to bring that incoming air to the room temperature. For example, if the space is 75 °F, makeup air should be roughly between 65 °F and 85 °F. Larger differentials would increase energy use and comfort issues, so the maximum allowed differential is 10 °F.