Should AC discharge (supply) vents be grilled with metal or wood?

The correct choice highlights the importance of minimizing condensation in AC discharge (supply) vents. Wood is often selected for this application because it can absorb moisture, reducing the likelihood of condensation forming on the surface. Condensation can lead to various issues such as mold growth, damage to the vent, and decreased efficiency of the air conditioning system.

Choosing wood for the vents may also provide some natural insulation, which can help in maintaining the air temperature as it moves through the ductwork. This can be particularly beneficial in preventing cold surfaces that attract moisture, which is a key concern in air handling systems.

Metal, while durable, can sometimes exacerbate condensation issues due to its conductive properties, which allow temperature changes to affect the surface more directly, potentially leading to moisture forming on the metal. Plastic, though lightweight, may not provide the necessary moisture absorption properties that wood offers. Therefore, wood is generally favored in this context to enhance performance and reduce maintenance concerns related to condensation.