Duct Accessories

A GI Duct Corner, also known as a Galvanized Iron Duct Corner or Duct Flange Corner, is a crucial component used in heating, ventilation, and air conditioning (HVAC) systems and various industrial applications. It is essentially a piece of galvanized iron sheet, typically bent at a 90-degree angle, that facilitates the connection and reinforcement of straight duct sections, allowing the ductwork to change direction.

A TDF (Transverse Duct Flange) corner is a key component in the fabrication of rectangular HVAC (Heating, Ventilation, and Air Conditioning) ducts. It's an integral part of the TDF flanging system, which provides a strong, leak-resistant, and relatively easy-to-assemble method for connecting ductwork sections. Here's a short specification of a TDF corner: Function: To connect the four sides of a rectangular duct flange, forming a rigid and air-tight corner for the TDF duct connection system. Material: Typically galvanized steel, though other materials like stainless steel may be used for specific applications (e.g., corrosive environments). The gauge of the steel will vary depending on the duct size and pressure requirements, but common gauges range from 18 GA to 24 GA. Design/Profile: Integrated Lip/Flange: The defining feature is a pre-formed lip or flange that runs along its edges. This lip is designed to interlock with the formed TDF profile on the duct sheet itself. Angle: Most commonly a 90-degree angle to form a standard rectangular corner. Corner Reinforcement: Often includes a dimple, embossment, or pre-punched hole for insertion of a corner clip or bolt for additional reinforcement and sealing. Gasket Groove (Optional): Some TDF corners may have a small groove designed to accommodate a sealant or gasket material for an even tighter seal. Dimensions: Leg Lengths: The two perpendicular legs of the corner will have specific lengths that correspond to the width of the TDF profile on the ductwork. Overall Size: Varies based on the size of the ductwork it's designed for, as TDF systems come in different standard sizes (e.g., TDF 25, TDF 35). Key Features & Advantages: No Welding Required: Eliminates the need for welding on-site, simplifying installation. Cost-Effective: Reduces labor costs due to faster assembly. Strong and Rigid Connection: Provides excellent structural integrity to the duct system. Good Sealing Properties: When properly assembled with clips and sealant, it offers a high degree of airtightness, minimizing air leakage. Standardized: Widely adopted in the HVAC industry, making components readily available and interchangeable. Installation: TDF corners are typically inserted into the pre-formed TDF profile on the duct ends and then secured with TDF clips or bolts, often in conjunction with a sealant. In essence, the TDF corner is a precisely manufactured piece that, when combined with the TDF roll-formed duct ends and specialized clips, creates a highly efficient and effective method for assembling HVAC ductwork.