Duct covers must be installed with the large hole of the key slot facing which direction?

Duct covers should be installed with the large hole of the key slot facing downward. This orientation is essential for several reasons:

Firstly, when the large hole faces downward, it allows for proper drainage of any condensation or moisture that might accumulate within the duct system. This is particularly important in areas subject to temperature fluctuations, where condensation can lead to mold growth or damage to both the ductwork and surrounding structures.

Additionally, having the key slot oriented downward makes it easier to secure and lock the duct cover in place, ensuring that it remains sealed during operation. This helps maintain the integrity of the duct system and prevents any unwanted contaminants from entering.

Furthermore, a downward orientation can aid in proper airflow within the system, as it avoids any obstructions that may occur if the key slots were positioned differently. By adhering to this installation guideline, you help to ensure the overall efficiency and safety of the ductwork system.