Which three items are typically included in a grille callout?

The items included in a grille callout are primarily focused on the specifications that define how the grille will function within the HVAC system. These specifications typically encompass the type of grille being used, the method of connection to the ductwork or system, and the cam or adjustment features that may be part of the grille design.

Understanding the function of these callouts is important in HVAC design and installation. The type describes the specific style of the grille, such as a return or supply grille, which influences air distribution. The connection details ensure that the grille can be properly attached to the duct system, facilitating an efficient flow of air. The cam features, if applicable, indicate how airflow can be adjusted once the grille is in place, providing flexibility in managing air distribution after installation.

While the other options include relevant aspects of HVAC components, they do not directly align with the specific criteria typically included in a grille callout. For instance, size, shape, and color focus more on aesthetic and fitting properties rather than functional specifications, while location, orientation, and material may pertain to broader installation contexts but lack the direct specification details needed for a grille callout. Pressure, flow, and temperature are parameters measured during operation and are not part of the specifications used for selecting