What type of grille does Exhaust fan 2, located south of the chiller in Room 007, use for air intake?

The exhaust fan in question is specified to use an 18" square grille for air intake, which aligns with common practices in HVAC design where specific sizes are designated based on the airflow requirements and the design of the system. The 18" square grille is typically chosen for its ability to provide an adequate area for air intake, ensuring optimal airflow and efficiency for the exhaust fan's operation.

In contexts such as room design, positioning of equipment, and airflow dynamics, having the correct size and type of grille is crucial. An 18" square grille allows for sufficient air volume to enter the exhaust fan, which is especially important when dealing with equipment like chillers that have specific cooling and air exchange requirements.

Other options like a 12" round grille, a 24" rectangular grille, and a 10" circular grille would either be too small or too large compared to the specified requirement, impacting the effectiveness of the air intake for the exhaust fan operation. This understanding of grille sizing helps in maintaining airflow balance and ensuring that ventilation systems operate within their designed parameters.