Diffusers

This section describes how to use diffusers.

Common Diffuser Information

The values that can be specified for a diffuser are listed below.

Callout: The name of the diffuser.

Include in Schedule: This checkbox controls whether the diffuser type is displayed in the diffuser schedule that is inserted on the drawing. Most diffuser types will have this box checked. It is commonly unchecked for existing diffuser types.

Block Number: The block number used to choose the block for the diffuser.

Block Type: The type of block used to represent the diffuser. See the Diffuser Blocks section for more information.

Description: A description of what type of diffuser has been defined. The description will appear on the diffuser schedule on the drawing.

MFR/Model: A description of the model and manufacturer of the diffuser that will appear on the diffuser schedule on the drawing.

Notes: A note that will appear on the diffuser schedule on the drawing

CFM Range, Min: The minimum airflow for the diffuser.

CFM Range, Max: The maximum airflow for the diffuser.

Noise at Maximum: The noise level of the diffuser when the maximum amount of air is flowing through it. This value is displayed on the diffuser schedule on the drawing.

Airflow: The type of air flowing through the diffuser. The diffuser layers and block are chosen based upon the airflow.

Exhaust: Exhaust diffuser. Diffuser block typically has a full slash and a half slash.
Outside Air: Outside air diffuser.
Return: Return diffuser. Diffuser block typically has a single full slash.
Supply: Supply diffuser. Diffuser block typically has two slashes.

Throw Range, Min: The minimum distance that the diffuser will throw air. This value is displayed on the diffuser schedule on the drawing.

Throw Range, Max: The maximum distance that the diffuser will throw air. This value is displayed on the diffuser schedule on the drawing.

Pressure Drop Through Diffuser: The pressure drop through the diffuser. This value is provided by the manufacturer.

Face Width (in): The size of the diffuser. For rectangular, sidewall, and slot diffusers, the value is the width. For round diffusers, the value is the diameter.

Face Depth (in): For rectangular, sidewall, and slot diffusers, the depth of the diffuser. For round diffusers, the value is ignored.

Nominal Size (in): The nominal size of the diffuser. This value is displayed on the diffuser schedule on the drawing

Neck Width: The size of the diffuser neck. This value is either the width or the diameter, depending upon the value of the Neck Depth field.

Neck Depth: The depth of the diffuser neck. If this value is 0, the neck is round.

Connection Type: How ducts connect to the diffuser. This value can be changed on individual diffusers.

Top / Bottom: Ducts connect to the top or bottom of the diffuser, depending upon whether it is located on the ceiling or the floor.
Side: Ducts connect to the side of the diffuser.

Default Location: Where the diffuser is located. This setting controls which direction the ductwork connecting to the diffuser comes from. This value can be changed on individual diffusers.

On Ceiling: The diffuser is located in the ceiling. The ductwork connecting to the diffuser comes from above.
On Floor: The diffuser is located on the floor. The ductwork connecting to the diffuser comes from below.

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