PVC H Chair Accessories

Crafted from high-quality polyvinyl chloride (PVC), the chair-shaped sectional profile features a unique "chair-like" cross-section with supportive flanges and webs. Serving as a critical structural backbone, it provides robust mechanical reinforcement for duct panels, flanges, and accessories, effectively preventing deformation under dynamic air pressure or mechanical loads. Lightweight yet durable, this component is ideal for corner connections, bracket fixings, and edge reinforcements, ensuring long-term stability in high-frequency usage environments. Its chemical resistance to moisture, corrosion, and common HVAC contaminants further enhances system longevity.​

Our pre-insulated duct accessories include factory-integrated elbows, tees, reducers, and flanges, all embedded with premium thermal insulation. The insulation core, available in either polyurethane (PU) or polyisocyanurate (PIR) foam, offers exceptional thermal resistance (PU: ≤0.024 W/m·K; PIR: ≤0.022 W/m·K) and sound absorption, reducing energy loss by up to 30% compared to non-insulated systems. PIR variants excel in high-temperature scenarios (up to 150°C) with improved fire retardancy (B1 fire rating per GB 8624), making them suitable for sensitive environments like data centers or hospitals. These pre-fabricated accessories minimize on-site labor, enabling precise and rapid installation while maintaining airtight seals.​

The PVC H flange joint, measuring 4 meters in length, serves as a reliable connecting element for pre-insulated duct panels. Its H-shaped cross-section design ensures seamless alignment and secure fastening via bolts or quick-release clamps, creating a leak-proof connection with airtightness compliant with ISO 15069 standards (leakage rate <0.1 m³/m·h at 1000 Pa). Constructed from impact-resistant PVC, the flange joint withstands thermal expansion/contraction and mechanical stress, ensuring consistent performance across temperature fluctuations (-20°C to 60°C for PU; -40°C to 140°C for PIR systems). Its standardized 4-meter length matches common duct panel dimensions, streamlining inventory management and installation workflows.​

The heart of the system, these panels consist of a rigid foam core (PU or PIR) sandwiched between protective facings, such as galvanized steel, aluminum foil, or UV-resistant polymer sheets. The PU panels excel in general HVAC applications with excellent thermal efficiency, while PIR panels offer superior fire resistance and high-temperature stability, making them ideal for industrial exhaust systems or smoke extraction networks. The panels' modular design allows easy assembly into rectangular or circular ducts, with pre-cut grooves for flange integration. Typical thicknesses range from 25mm to 100mm, customizable to meet specific R-value requirements (R-value: 1.2 m²·K/W for 50mm PIR).​