Learn Plenum box sizing FCU & AHU :

What is a Plenum Box

A plenum is a distribution box that is fastened to the air handling unit’s supply outlet and frequently return inlet. Additionally, plenum boxes are used to transfer warm or cooled air to many rooms. In addition, it serves to equalize the air and reduce noise produced by duct air movement.

Determine Airflow Requirements:

Finding out how much airflow the room needs is the first step. Usually, this is expressed in cubic feet per minute (CFM). This information can be computed based on the size and use of the area, or it can be obtained from HVAC system specs.

Types of Plenum Box:

• Supply Plenum Box: Distributes conditioned air from the HVAC system to various rooms or zones.
• Return Plenum Box: Collects air from different zones and channels it back to the HVAC system.

Materials of Plenum Box:

• Constructed from galvanized steel, aluminum, or other durable materials.
• Insulation might be added to reduce heat transfer or condensation.

Design Considerations:

• The shape and size are determined by airflow requirements and system design.
• Rectangular, square, or circular shapes are common.
• Insulated or non-insulated based on location and environmental conditions.

Installation of Plenum Box:

• Positioned strategically to ensure optimal airflow and efficiency.
• Connected to the main ductwork using appropriate fittings and seals.

Importance:

• Properly sized and installed plenum boxes ensure uniform air distribution, maintaining consistent comfort levels throughout the building.
• They contribute to system efficiency and performance.

Regulations and Standards:

• Sizing, materials, and installation methods might be governed by building codes and HVAC industry standards to ensure safety and efficiency.

Maintenance:

• Regular inspections and maintenance are necessary to ensure airflow remains unobstructed and the box remains sealed to prevent air leakage.