Ductwork:
Crucial role in directing air throughout the commercial HVAC system.
Different shapes and sizes of ductwork.
Types of Ducts:
Rectangular Ducts:
Advantages:
Greater flexibility for width or height restrictions.
Require less maintenance.
Disadvantages:
More difficult to seal joints.
Require more metal for the same airflow rate as round ducts.
Round Ducts:
Often used in low-pressure systems.
Advantages:
Easier to insulate and seal.
Easier to install, requiring less material and can be easily bent.
Smaller surface area per unit cross-sectional area, resulting in less leakage.
Disadvantages:
Require greater height clearance for installation.
More difficult to clean, leading to dust and debris buildup.
This buildup can reduce efficiency over time.
Duct Leakage and Plugging:
Causes: Low air speed, flexible ducts, modifications, lack of cleanouts.
Prevention: Welding seams to prevent leakage.
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