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HV Duct: High-Velocity HVAC Duct Sealant
HV Duct is a professional-grade, water-based duct sealant designed for sealing joints in high-velocity heating, ventilation, and air conditioning (HVAC) ductwork. It delivers a pressure-resistant, airtight seal on sheet metal ducting and remains permanently flexible after curing. Suitable for both internal and external applications, HV Duct is easy to apply, non-slumping, and adheres strongly to galvanised steel, aluminium, and common ducting substrates.
Key Features & Specifications
- Water-based, low-VOC formulation for safe indoor use
- Pressure-resistant – ideal for high-velocity air systems
- Flexible seal accommodates thermal and mechanical movement
- Non-slump formula – suitable for horizontal and vertical joints
- Adheres to galvanised steel, aluminium, and fibreglass ducting
- Dries to a durable, paintable finish
- Suitable for internal and external ductwork applications
Why Choose HV Duct?
- Maintains airflow integrity and energy efficiency
- Helps meet building energy compliance standards
- Fast application with brush or caulking gun
- Safe for use in confined indoor spaces
- UV-resistant – ideal for exposed duct joints
Best Practices: Do's & Don'ts
Do
- Ensure surfaces are clean and dry before application
- Use brush or extrusion gun for uniform coverage
- Apply in temperatures between 5°C and 40°C
Don't
- Don’t apply over standing water or active condensation
- Don’t use on surfaces contaminated with oil or rust
- Don’t expose uncured product to freezing temperatures
Trade Use Cases: Applied in the Field
HVAC Installer: Sealing Sheet Metal Joints
The Problem
High-velocity duct system leaking at mechanical joints, reducing efficiency and triggering inspections.
The Solution
HV Duct created a flexible, airtight seal over each joint, restoring system integrity and meeting compliance.
Best Practice
Use a brush to apply a consistent layer over seams, allow 24 hours to dry before system pressure-up.
Frequently Asked Questions
What types of ducts is HV Duct compatible with?
HV Duct adheres to galvanised steel, aluminium, fibreglass, and other common duct substrates. It’s ideal for both rigid and flexible ducting.
Can HV Duct be used on exterior ductwork?
Yes. Once fully cured, HV Duct is UV- and weather-resistant, making it suitable for external use.
How long does it take for HV Duct to dry?
Drying time is typically 24 hours, depending on humidity and application thickness. Full cure may take up to 72 hours.
Can I paint over HV Duct?
Yes. HV Duct dries to a paintable surface and can be coated with most water-based paints once cured.
Is HV Duct safe to use indoors?
Yes. HV Duct is a water-based, low-VOC formulation and is safe for use in occupied buildings and enclosed spaces.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Sealing sheet metal HVAC duct joints | Maintains airtightness and pressure efficiency in high-velocity systems | HVAC Installers, Mechanical Contractors |
| Jointing insulated duct board systems | Flexible seal adapts to movement and thermal expansion | Air Conditioning Technicians |
| Sealing around duct penetrations through masonry or plasterboard | Improves fire barrier and air-tight performance | Builders, Commercial Fit-Out Teams |
| Preventing dust and air leakage in return air systems | Improves indoor air quality and energy efficiency | HVAC Maintenance Teams, Facility Managers |
| DIY HVAC duct repairs | Easy application with brush or cartridge, low odour | Homeowners, DIY Enthusiasts |
How to Apply HV Duct: Step-by-Step
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1. Surface Preparation
Ensure all surfaces are clean, dry, and free from oil, dust, and rust. Light abrasion may help adhesion on smooth or painted surfaces.
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2. Cut and Load
Cut nozzle at an angle to match desired bead width. Load cartridge into a standard caulking gun or use a brush application directly from tub.
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3. Apply Sealant
Apply a uniform bead of HV Duct to all seams and joints. Use a brush to spread the sealant evenly if required.
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4. Tool & Smooth
Tool the bead with a spatula or brush to ensure full contact and a neat finish. Avoid overworking the sealant.
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5. Allow to Cure
Allow to dry for 24 hours before pressure testing or exposing to external weather. Full cure is typically achieved within 72 hours depending on conditions.
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6. Clean Up
Clean tools and excess product with water while still wet. Once cured, mechanical removal is required.
Limitations & Safety
Product Limitations
Not suitable for continuously submerged or high-humidity environments such as pools or steam ducts.
Avoid use on oily or greasy metal surfaces without proper degreasing.
Do not apply when ambient temperature is below 5°C or above 40°C.
Protect uncured product from freezing temperatures.
Safety & Handling Guidelines
Personal Protective Equipment
Wear gloves and protective clothing to prevent skin contact. Safety glasses recommended during overhead or brush application.
Ventilation
Ensure adequate ventilation during application, especially in enclosed duct spaces.
Storage & Disposal
Store in a cool, dry area between 5°C and 30°C. Keep containers sealed when not in use. Dispose of product and container in accordance with local regulations.
First Aid Measures
Eye Contact: Rinse thoroughly with clean water for 15 minutes. Seek medical advice if irritation persists.
Skin Contact: Wash with soap and water. Remove contaminated clothing.
Inhalation: Move to fresh air. If discomfort persists, consult a doctor.
Ingestion: Rinse mouth. Do not induce vomiting. Seek immediate medical attention.
Refer to the Safety Data Sheet (SDS) for HV Duct for full safety details.
HV Duct Substrate Compatibility & Surface Preparation
Galvanised Steel & Aluminium
Surface Prep
Wipe clean with a solvent cloth to remove oil and dust. Light abrasion may improve adhesion on smooth surfaces.
Primer Not Required
Fibreglass Duct Board
Surface Prep
Remove loose fibres and dust. Ensure the surface is stable and not shedding. Test adhesion on highly textured areas.
Primer Not Required
PVC or Coated Ducting
Surface Prep
Clean with alcohol-based cleaner. Lightly sand glossy surfaces before application.
Primer Optional – Test before full application
Concrete, Brick or Masonry Surrounds
Surface Prep
Remove dust and debris using a stiff brush or vacuum. Surface must be dry before application.
Primer Not Required
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