During yearly maintenance of a pellet hearth system, what component should not be lubricated unless specified?

The correct choice is that blowers should not be lubricated during maintenance unless specifically indicated by the manufacturer’s guidelines. This is important because many modern blowers are designed with sealed bearings that do not require lubrication. In fact, applying lubricant to these types of blowers can cause damage or lead to failure due to attract dust and debris, which can adversely affect their performance.

Additionally, blowers are engineered to operate efficiently without additional lubrication and might already have sufficient lubricant sealed within them. Therefore, following manufacturer recommendations is crucial to maintain optimal functioning and longevity of the system. Always refer to the specific maintenance instructions provided for each component to ensure proper care and avoid unintended harm.