Fiberglass ducts are widely used in public buildings and HVAC systems due to their lightweight, integrated insulation and sound absorption properties. However, their structural characteristics dictate high installation precision requirements; improper control can easily affect system airtightness, operating noise, and overall lifespan.

I. Duct Dimensions and Geometric Precision Requirements

Before installation, the cross-sectional dimensions, length, and interface specifications of fiberglass ducts should be strictly verified to ensure consistency with the design drawings.

The duct cross-section should be square, without significant twisting, warping, or deformation. Excessive cross-sectional deviation can lead to abnormal local airflow and increased system resistance.

During the installation of straight duct sections, the axis should be kept straight, avoiding significant bends or "serpentine" offsets. The centerline deviation between adjacent ducts should generally be controlled within a small range to ensure the continuity and aesthetics of the overall piping.

II. Installation Precision Control at Connection Points

The connection points of fiberglass ducts are a key focus of installation precision control. Flanges or plug-in structures should be coaxially aligned, with flat interfaces, and free from misalignment or skewing.

Height differences or angular deviations at connections can easily lead to poor sealing, creating air leaks and reducing system efficiency.

Sealing strips or materials should be evenly stressed, and there should be no noticeable gaps after the joint is closed. Excessive compression can damage the fiberglass sheet structure, while insufficient compression will affect airtightness.

III. Horizontal and Vertical Requirements

When fiberglass ducts are installed horizontally, good horizontality should be controlled to avoid significant sagging or undulation. Especially in long-span ducts, excessive horizontal deviation will affect the stress distribution on the supports.

When installing risers or vertical ducts, verticality should be ensured to prevent the duct's weight from concentrating at a single connection point, causing joint deformation or cracking.

IV. Support Positioning Accuracy Requirements

The positional accuracy of supports directly affects the structural stability of fiberglass ducts. The spacing between supports should meet design and specification requirements and should not be too large or too small.

During installation, ensure that the supports and hangers are aligned with the duct's stress points to avoid localized suspension or uneven stress, preventing long-term deformation of the fiberglass sheets under pressure.

Protective measures should be taken at the contact points between the supports and hangers and the duct to prevent metal parts from directly compressing the fiberglass material and affecting the structural integrity of the duct.

V. Interface Sealing and Airtightness Accuracy

Fiberglass duct systems have high requirements for airtightness; insufficient installation accuracy often manifests first as air leakage.

The interface seal should be continuous and complete, with a uniform adhesive layer thickness, and there should be no gaps or omissions in the adhesive. After construction, key areas should be inspected to ensure there are no obvious potential air leaks at the interfaces.

Good installation accuracy can effectively reduce system operating noise, improve air supply efficiency, and reduce energy consumption.

VI. Coordination Accuracy with Other Systems

In integrated pipeline environments, fiberglass ducts should maintain reasonable spacing from water pipes, cable trays, sprinkler systems, etc. Elevation and routing should be planned in advance during installation to avoid duct deformation due to collisions or forced adjustments.

Where ducts pass through walls or floors, ensure that the opening size matches the duct's shape to avoid duct compression or stress concentration at the joints due to misalignment.

In summary, the installation accuracy of fiberglass ducts not only affects the appearance but also directly determines the system's airtightness, operational stability, and service life. Only through strict control of key aspects such as dimensions, connections, supports, and seals can the comprehensive performance advantages of fiberglass ducts in HVAC systems be fully realized.