Pre-Insulated Ductwork Complete Sealing Accessories Guide

PIR and phenolic pre-insulated ductwork, sealing accessories determine duct air tightness, anti-condensation performance and overall service life. Joint seams, flange connections and cut panel edges are vulnerable spots for air leakage and moisture infiltration.  GFI offers a complete line of sealing accessories specifically designed for pre-insulated ductwork comprising three  product categories: high-tensile aluminum foil sealing tape, joint flange profiles 和 duct-specific sealant. These products are compatible with GFI all  PIR and phenolic duct panels.

Aluminum Foil Tape: Seals basic gaps and prevents moisture penetration

Aluminum foil tape is an essential sealing material for ductworks installation. It is primarily used to seal panel joints, repair cuts, and fix damaged facings. The aluminum foil layer forms a complete vapor barrier, preventing external moisture from penetrating the foam core.

1. Product Performance Advantages

GFI aluminum foil tape is thickened and stretchable, making it tear-resistant. Its adhesive backing offers strong adhesion and resists peeling in both high- and low-temperature environments.

2. Suitable Applications

• General commercial projects: Sealing joints in concealed PIR duct panels for ceilings in shopping malls, office buildings, and hotels;
• Semi-exposed outdoor projects: Repairing gaps on the surfaces of black UV-coated ductwork in exhibition tents;
• Spot repairs: Repairing damage to the aluminum foil facing caused by transportation or cutting, and temporarily sealing small gaps;

Splicing Flanges: Reinforcing Ductwork Structures and Ensuring Airtight Seams

As connecting components between straight ducts, elbows and reducers. Flanges serve a dual purpose of structural reinforcement and seam sealing, making them indispensable accessories for large-diameter ducts and high-pressure air distribution systems.

1. Product Performance Advantages

GFI flange grooves are precisely matched to sheet thickness. Rigid profiles enhance the overall structural strength of the ductwork and reduce deformation and vibration.

2. Suitable Applications

• Large-scale ventilation projects: Joining large-cross-section main supply ducts in shopping malls and exhibition halls;
• High-pressure ventilation systems: High-velocity supply ductwork in factories and large-scale office buildings;
• Fire protection and smoke exhaust ductwork: Segmented connections for metal fire-rated ducts and thickened PIR fire-rated ducts;
• Damp underground spaces: Basement ventilation ductwork; the one-piece flange design minimizes moisture infiltration through gaps.

Specialized Sealant :Deep-Seal Flange Solution for Humid and Clean Environments

GFI’s sealant for ductwork is flexible, heat-resistant, non-corrosive and resistant to mold and moisture. It fills gaps in flanges and deep voids at panel joints.

1. Product Performance Advantages

The sealant remains elastic after curing and accommodating slight duct deformation without cracking.It does not corrode PIR/PUR or Phenolic foam core materials

2. Suitable Applications

• High-humidity conditions: Flange sealing for ventilation ducts in damp underground equipment rooms and swimming pools;
• Clean medical environments: Filling and sealing of phenolic duct flanges in hospital operating rooms and cleanrooms;
• High-standard fire protection projects: Double-layer sealing of fire-resistant duct flanges to enhance fire containment performance;
• Low-temperature air distribution systems: Central air conditioning low-temperature supply ducts, preventing condensation from seeping through flange gaps.

结论

Sealing pre-insulated ductwork requires the appropriate combination of aluminum foil tape, flanges and sealant based on the panel type operating environment and air pressure and humidity conditions.  GFI sealing accessories are our own PIR and phenolic pre-insulated duct panels. They deliver perfect dimensional and performance compatibility. Customers can ship these accessories together with duct panels in full container loads, sourcing all HVAC installation consumables from us in one-stop.