V0 PPs Fireproof Ductwork

Product Model	V0 Flame Retardant PPs Non-Standard Duct Fittings
Category	Custom Equipment Fabrication
Reference Price	Price on request

Hot Customizable for Working Conditions 10 Technical Parameters

Product Overview

The V0 PPs Flame-Retardant Duct is a non-standard corrosion-resistant ventilation duct and its accessories, manufactured using PPs sheets that meet the V0 flame-retardant grade, through cutting, bending, hot melt welding, and flange processing. It is used for conveying corrosive exhaust gas with high requirements for fire resistance. V0 represents a high plastic flame-retardant grade, indicating that the material self-extinguishes quickly upon fire exposure and does not produce flaming drips in standard vertical burning tests. Compared to ordinary PPs ducts, V0 PPs ducts maintain acid and alkali corrosion resistance while offering enhanced flame retardancy, making them primarily suitable for indoor, equipment floor, and high fire-resistance requirements corrosion-resistant exhaust systems.

This product falls under non-standard equipment processing, meaning it is not a standard finished product with fixed specifications. Instead, it is processed section by section based on engineering drawings and on-site measured dimensions: the cross-section can be square, rectangular, or round, and it can be processed into straight ducts, elbows, tees, crosses, reducers (large-to-small ends, square-to-round), flanges, dampers, inspection covers, etc. The sheet thickness is selected based on duct diameter, air pressure, and reinforcement requirements, with welds using the same V0 flame-retardant welding electrodes. For indoor corrosion-resistant exhaust projects with complex layouts, numerous equipment connections, and special cross-sectional dimensions, non-standard processing ensures precise matching between the ducts and the site.

Xicheng Environmental can undertake non-standard processing of V0 PPs flame-retardant ducts and accessories based on drawings or samples, or provide detailed processing drawings based on on-site measurements. We offer complete V0 flame-retardant corrosion-resistant piping systems, including sheets, ducts, accessories, flanges, and dampers, as well as ancillary V0 flame-retardant equipment such as spray towers and activated carbon boxes. This ensures uniform material and flame-retardant grade throughout the entire system, making it suitable for indoor corrosion-resistant ventilation projects in industries such as chemical, electroplating, semiconductor, and laboratories.

Working Principle

The duct itself serves as an exhaust gas transportation channel and does not perform purification functions. Its role is to transport exhaust gas collected from pollution sources to purification equipment and then discharge it through an exhaust stack under the power of the fan. The fan creates negative or positive pressure in the system, causing airflow to move along the duct. The cross-sectional size of the duct is determined based on air volume and design velocity. Low velocity is uneconomical, while high velocity results in excessive resistance and noise. Corrosion-resistant ducts achieve efficient exhaust gas transport to treatment facilities through reasonable cross-sectional design and duct fitting layout, ensuring corrosion resistance and airtightness.

The key performance of V0 flame-retardant ducts lies in the material and welding. PPs is polypropylene with flame-retardant additives, resistant to acid, alkali, and salt corrosion. V0-grade sheets suppress combustion upon contact with a flame source, self-extinguish, and do not produce flaming drips, reducing the risk of the duct being ignited and flames spreading along the pipeline. Connections between ducts are made using V0-grade PPs welding electrodes for hot melt welding or flange connections. The welds must ensure both strength and sealing (preventing exhaust gas leakage or air leakage) while maintaining flame-retardant continuity, avoiding fire-prone weak points at welds and flange gaskets. It should be noted that V0 flame retardancy reduces the fire risk of the duct itself, but the system still requires fire dampers, thermal expansion compensation for supports/braces, and static electricity grounding to be installed in accordance with regulations.

Structural Composition

The V0 PPs flame-retardant duct system consists of straight ducts, various fittings, flanges, supports/braces, and accessories. Straight ducts are divided into rectangular (square) ducts and round ducts. Rectangular ducts are formed by bending and welding PPs sheets, while round ducts are formed by rolling sheets into circles and welding. External walls of ducts are equipped with reinforcing ribs or rings based on dimensions to withstand negative or positive pressure from fans without deformation.

Fittings include elbows, tees, crosses, reducers (large-to-small ends, square-to-round), round-to-square, square-to-round, inspection covers, and cleaning openings, all welded from V0 PPs sheets. Duct sections are connected using flanges, which are welded from PPs sheets or formed flanges, equipped with sealing gaskets and bolts. The system can be equipped with V0 flame-retardant PPs dampers, check valves, and flexible connections. External to the ducts, PP-coated steel supports or corrosion-resistant supports/braces are installed to support long straight duct sections, accounting for thermal expansion and contraction. Fire dampers are installed at fire compartment crossings as per fire protection design, and flexible connections are used at duct connections to equipment for vibration isolation. All materials, welding electrodes, and accessories are selected in accordance with V0 flame-retardant requirements.

Specification and Model Table

The table below shows the main processing forms of V0 PPs non-standard ducts, with specific dimensions based on drawings.

Item	Processing Form	Description
Cross-section	Square, Rectangular, Round	Designed based on air volume
Fittings	Elbows, Tees, Reducers	Matched based on layout
Connection	Flange / Welded	Sealed and Flame-Retardant
Flame Retardancy	V0 Grade PPs	Self-Extinguishing

Product Features

The V0 PPs flame-retardant duct combines corrosion resistance with high flame retardancy, offers non-standard customization, and provides complete system solutions, making it a safe pipeline for indoor corrosion-resistant exhaust projects. The main features are as follows.

V0-grade flame-retardant PPs sheets, self-extinguishing, high flame-retardant grade
Corrosion-resistant to acids, alkalis, and salts, suitable for corrosive exhaust gas transport
Square, round, and irregular fittings processed non-standardly based on drawings
Welded with the same V0-grade PPs welding electrodes, good sealing and flame-retardant continuity
Complete supply of flanges, fittings, and dampers, ensuring uniform system material
Sheet thickness and reinforcement designed based on air pressure, reliable strength
On-site measurement and detailed design for precise matching with equipment and site

Material of Sheet	V0 rated flame retardant PP boards
Welding Rod Material	V0 Flame Retardant PP Welding Rod
Sectional Form	Square / Rectangular / Circular
Processing Method	Non-standard custom parts processing
Connection Method	Flange / Hot melt welding
Flame Retardancy Rating	V0 Level
Corrosion resistance performance	Acid and Alkali Salt Resistant
Accessories Pipe Fittings	Bent Tee Variable Duct Flow Valve
Plate thickness reinforcement	Designed according to wind pressure
Applicable scenarios	Indoor high fireproof requirements

Application Industries

Indoor high fireproof and corrosion-resistant exhaust ducts for chemical workshops
V0 flame retardant ducts for electroplating and surface treatment production lines
Corrosion-resistant ventilation ducts in equipment layers of semiconductor and panel factories
V0 flame retardant ventilation ducts for laboratories and testing institutions
Indoor pipeline systems with V0 flame retardant activated carbon boxes
Corrosion-resistant fire exhaust projects in basements and equipment mezzanines
Non-standard corrosion-resistant duct fabrication for complex routing and special cross-sections

Typical Process Locations

V0 PPs flame retardant ducts are used to connect hoods, purification equipment, fans, and exhaust stacks, forming a complete corrosion-resistant exhaust system: exhaust gas from pollution sources is collected by branch and main ducts, sent to scrubbers or activated carbon boxes for purification, and then discharged through V0 flame retardant fans and exhaust stacks. V0 PPs ducts are used in indoor and equipment layer sections, through fire compartment sections, and pipe sections connected to V0 flame retardant equipment to ensure the overall flame retardancy of the indoor system. Pipes are processed and numbered in segments according to detailed drawings, assembled with flanges on-site, and equipped with soft connections at equipment inlets and outlets. Fire dampers are installed according to fire protection design.

Before processing, the cross-section and plate thickness of each pipe segment are determined based on airflow, and processing drawings are drawn by combining on-site measurements and equipment interfaces, with dimensions and numbering marked for each pipe segment, fitting, and flange. During installation, assembly is performed according to numbering, with flange gaskets and bolts tightened evenly, welds and joints checked for seal integrity, support and hanger spacing meeting requirements without imposing weight on equipment, and thermal compensation installed on long straight pipe segments. During acceptance, the V0 flame retardancy certification of the plate material is verified, welds and flanges checked for tightness, and air leakage tests conducted to confirm the correct installation of dampers, fire dampers, and soft connections, ensuring the pipeline does not leak under negative pressure and meets fire protection requirements for flame retardancy level.

Both are acid and alkali resistant, differing in flammability rating. Standard PPs sheets have limited flammability with a low rating, while V0 PPs sheets self-extinguish quickly upon fire exposure and do not produce flaming drips in standard combustion tests, offering stronger flammability resistance. They are suitable for high fire protection requirements in indoor spaces, equipment layers, basements, etc. Standard PPs sheets can be used for outdoor or low fire protection requirement applications to control costs. When selecting, ensure the entire indoor system (ducts, fittings, dampers, flexible connectors) is made of V0 material and provides flammability test reports. V0 should not be used only locally, otherwise the system's flammability continuity will be compromised.

When standard specifications cannot meet on-site requirements, non-standard processing is required, such as: complex indoor pipeline routing, requiring a large number of custom-shaped elbows and tees; special equipment interface dimensions and orientations, needing transition pieces like round-to-square and square-to-round; custom rectangular sections constrained by ceiling height and structural limitations; matching with V0 flame-retardant equipment requiring unified material and flange specifications; retrofitting projects with limited space requiring on-site measurement and piping installation. Non-standard processing is manufactured section by section according to drawings, ensuring precise installation, but the processing cycle is longer than standard pipes. Drawings or on-site measurements should be provided in advance.

Required. V0 Flame Retardant addresses the issue of the duct material itself being difficult to ignite and not spreading flames, which falls under material fire protection. Fire dampers are fire separation measures for ventilation systems. In cases where ducts pass through fire compartments, machine room partition walls, or floors, they automatically close to block smoke and fire from spreading through the ducts during a fire, which belongs to system fire protection design. The functions of the two are different and they cannot be mutually replaced. Whether to install fire dampers, their installation locations, and temperature ratings must be implemented in accordance with building fire protection design codes and fire review opinions, determined by the design unit. Fire dampers cannot be omitted simply because the duct is V0 flame retardant.

Qualified hot melt welding strength and sealing can meet the requirements of corrosion-resistant ducts. Air leakage and cracking are often caused by construction quality and operating conditions, such as improper welding temperature and speed, mismatched welding electrodes and sheet material or flame retardant grade, incomplete penetration or porosity in welds, aging of flange gaskets, excessive pipe support spacing causing stress, and failure to account for thermal expansion and contraction. Control measures include: using V0 welding electrodes of the same material, welding by skilled workers following the process, ensuring full welds and conducting inspections, uniformly tightening flanges, rationally setting supports and thermal compensation, and performing air leakage volume testing after installation.

Circular ducts offer low resistance, material savings, high strength, and reduced accumulation of debris. Under the same cross-sectional area, they provide excellent air tightness and cost-effectiveness, making them the preferred choice for outdoor overhead installations when space permits. Rectangular (square) ducts facilitate easy wall and beam mounting, maximize indoor space utilization, and align conveniently with rectangular equipment connections. They are commonly used in equipment rooms with limited ceiling height and indoor suspended ceilings, as well as for connecting with square purification equipment. Selection primarily depends on installation space, equipment interface compatibility, and cost-effectiveness. In complex indoor projects, a combination of rectangular, circular, and square-to-round transition pieces is often employed, with cross-sectional dimensions determined based on design velocity and airflow requirements.

Please provide ventilation system construction drawings (floor plans, sections, and system diagrams), flow rates and cross-sectional dimensions of each pipe section, exhaust gas composition and temperature, flame retardancy level requirements (V0), equipment interface dimensions and orientation, and on-site installation space. If construction drawings are unavailable, provide equipment layout and flow rate parameters, allowing the manufacturer to survey on-site and refine the processing drawings after confirmation before cutting. Additionally, specify plate thickness, flange standards, damper and flexible joint configurations, and whether fire dampers and support brackets are included. The more complete the data, the more accurate the pipe part numbering and on-site assembly, which can reduce rework and on-site pipe modifications.

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