What are the consequences of a damaged or absent exterior damper on a clothes dryer?

A damaged or absent exterior damper on a clothes dryer can have several significant consequences, particularly in terms of airflow and home safety. When the damper is not functioning properly or is completely missing, it fail to effectively control the exit of hot and moist air generated during the drying process. This allows not only conditioned air from inside the home to escape but also opens a pathway for outdoor air, including pests such as rodents and insects, to enter the house.

Moreover, without a proper damper, lint, moisture, and odors may also enter the living space, leading to potential indoor air quality issues and increased humidity levels, which can contribute to mold growth. In contrast, a well-functioning damper helps to maintain the efficiency of the dryer by ensuring proper exhaust, protecting the home from unwanted elements, and contributing to better ventilation overall.

The other options do not reflect the actual risks associated with a damaged or absent damper. So, while there are efficiency benefits with proper airflow, the critical concern is the potential for unwanted entry of air and vermin, which emphasizes the importance of a functioning exterior damper for any clothes dryer installation.