Ventilation ducts are essential equipment in fields such as air conditioning, purification, ventilation, and dust removal. Strict adherence to installation standards is crucial for ensuring the normal operation of the ventilation system, extending the lifespan of the equipment, and maintaining environmental hygiene. Below is a detailed explanation of the specific content of ventilation duct installation standards.
I. Foundation and Support
1. Foundation
First, a stable foundation must be provided for the installation of ventilation ducts. The duct foundation should meet the requirements and regulations of the building, such as concrete strength, waterproofing, and corrosion resistance. Before installation, a foundation inspection is necessary to ensure the flatness, levelness, verticality, and correct positioning of the duct foundation.
2. Support
The support for ventilation ducts should fully consider factors such as the self-weight of the ducts, environmental temperature changes, and loads including wind pressure. During the support process, durable, corrosion-resistant, and flame-retardant materials should be selected, and the positions, spacing, and methods of each support point should be arranged according to design requirements to ensure that the ventilation ducts are stable, secure, and safe.
II. Fire Prevention and Smoke Control
1. Fire Prevention
Before installation, ventilation ducts should undergo insulation and fire prevention treatment at locations such as inside and outside the duct, joints, and walls according to building requirements. The materials used for ventilation ducts should have good flame-retardant properties; fireproof cloth and sealing materials should meet national standards and obtain relevant quality inspection reports.
2. Smoke Control
The design of smoke control systems must fully comply with building design requirements. During installation, non-combustible materials should be used, and appropriate smoke doors and sealing devices should be installed to ensure system integrity and fire resistance. Smoke doors must be installed at the outlet of the ventilation ducts, and removable fireproof partitions must be used between the ducts and smoke doors to prevent fire spread.
III. Intermediate Joints
During the installation process of ventilation ducts, the selection of joints and connection methods significantly affects system performance and reliability. Therefore, when selecting joints and installation methods, various factors such as duct position, operating environment, and system requirements must be considered.
1. Flange Connection
Flange connection is one of the most commonly used joint methods in ventilation ducts. It features a simple structure, easy installation, strong disassembly capability, and good tightness. However, attention must also be paid to issues such as material selection for flanges, positioning accuracy, sealing performance, and bolt tightening force.
2. Riveted Connection
Riveted connection, also known as expansion rivet connection, is a method that connects two parts in a duct using rivets. This connection method has advantages such as high strength, simple structure, and no need for heat treatment; however, its disadvantage is that it cannot be disassembled and requires on-site operation with certain technical skills and experience from workers.
IV. Duct System
1. Design
In designing ventilation ducts, environmental factors, usage requirements, and safety requirements should be fully considered. Appropriate tools such as wind tunnel tests or CFD simulations should also be used during the design process to analyze and verify parameters like flow velocity, resistance, and pressure drop to ensure duct effectiveness and cost-effectiveness.
2. Manufacturing and Installation
During the manufacturing and installation of ventilation ducts, monitoring of materials, processes, and quality is necessary. The materials for ventilation ducts should comply with relevant national standards; during manufacturing processes, strict control over dimensional accuracy and surface flatness is required to ensure proper tightness during installation. Additionally, suitable tools and methods should be employed during installation to ensure quality and effectiveness—for example using automatic welding equipment or controlling air-tightness tests.
The standardization and practicality of ventilation duct installation play an important role in the stable operation of systems and environmental hygiene. During installation processes, multiple aspects such as foundation and support, fire prevention and smoke control, intermediate joints, as well as duct systems need to be considered while employing corresponding materials, techniques, and methods to ensure installation quality and service life.