6 Inch / 150mm Flexible Duct for Air Conditioning, Ventilation & HVAC Systems
Kingsman Engineering & Industrial Insulation Ltd is a leading importer and supplier of HVAC products, air-conditioning materials, refrigeration products and insulation solutions in Kenya and East Africa.
We supply and source 6-inch flexible ducting, approximately 150 mm nominal diameter, for suitable air-conditioning, ventilation and air-distribution applications.
6-inch flexible duct is a commonly encountered HVAC duct size and can be used for suitable connections between ductwork, grilles, diffusers, fans and other air-distribution components.
Its flexibility makes it particularly useful where ductwork needs to pass around obstacles, connect to terminal air outlets or accommodate installation constraints.
Looking for 6-inch flexible duct in Kenya?
Contact Kingsman Engineering for current availability, product specifications, quantities and quotations.
Call / WhatsApp:
0722 209 507
0721 953 570
What Is 6-Inch Flexible Duct?
A 6-inch flexible duct is a flexible air duct with a nominal diameter of approximately 6 inches, commonly identified as approximately 150 mm in metric HVAC applications.
It is designed to transport air through appropriate HVAC and ventilation systems while allowing the duct to bend and accommodate changes in direction.
Flexible ducting can be used to connect:
- Main ductwork to branch connections
- Branch ductwork to grilles
- Branch ductwork to diffusers
- Ventilation fans to suitable duct routes
- HVAC equipment to ductwork
- Air distribution outlets to duct branches
- Compatible extraction systems
The correct application depends on the HVAC design, airflow requirement, pressure conditions and product specification.
6-Inch Flexible Duct Size in Millimetres
A nominal 6-inch flexible duct is approximately 150 mm in HVAC metric sizing.
Mathematically, 6 inches equals 152.4 mm, while many HVAC products use 150 mm as the nominal metric equivalent.
| Nominal Size | Approximate Metric Equivalent |
|---|---|
| 6 inch | 150 mm |
This distinction is important when connecting flexible duct to another HVAC component.
Always confirm the actual connection dimensions before ordering.
If you are replacing an existing duct, send Kingsman:
- Connection diameter
- Photograph
- Required length
- Insulated/non-insulated requirement
- Application
6-Inch Flexible Duct Supplier in Kenya
Kingsman Engineering supplies HVAC, refrigeration and insulation products to customers in Nairobi and across Kenya, with supply capabilities extending into the wider East African market.
We serve:
- HVAC contractors
- Mechanical engineers
- Air-conditioning installers
- Refrigeration technicians
- Building contractors
- Facility managers
- Maintenance companies
- Industrial businesses
- Commercial businesses
- Institutions
- Project procurement teams
For major projects, send us your BOQ, HVAC drawing, mechanical schedule or product specification.
What Is 6-Inch Flexible Duct Used For?
6-inch flexible duct can be used in applications where its diameter, construction and airflow capacity are appropriate.
Common applications can include:
1. Air-Conditioning Systems
6-inch flexible duct may be used for suitable supply-air connections and branch connections.
2. Ventilation
It can be used for appropriate fresh-air, exhaust and general ventilation applications.
3. HVAC Branch Connections
It can form part of a branch connection between larger ductwork and an air outlet.
4. Grille Connections
Flexible duct can connect a suitable branch duct to an appropriately sized supply or return grille.
5. Diffuser Connections
6-inch flexible duct can be used to connect compatible ductwork to selected diffusers.
6. Ventilation Fan Connections
It can be used with compatible ventilation or extraction equipment where the fan connection and airflow requirements are appropriate.
6-Inch Flexible Duct for Air Conditioning
In an air-conditioning installation, flexible duct may form the final connection between the main or branch duct system and an air outlet.
A simplified system can look like:
Air-Handling Equipment → Main Duct → Branch Duct → 6-Inch Flexible Duct → Diffuser/Grille
The 6-inch diameter does not by itself determine the amount of air the duct can deliver.
The system design should consider:
- Required airflow
- Air velocity
- Static pressure
- Duct length
- Number of bends
- Duct construction
- Connection size
- Outlet type
- HVAC equipment specifications
For commercial and industrial installations, the mechanical design should determine the appropriate duct diameter.
6-Inch Flexible Duct for Ventilation
6-inch flexible duct can be suitable for various ventilation applications.
Potential applications include:
- Fresh-air supply
- Exhaust air
- General ventilation
- Equipment ventilation
- Branch ventilation
- Air extraction
- Selected workshop applications
- Commercial ventilation
The product should be suitable for the operating temperature, pressure, air quality and environment.
Insulated 6-Inch Flexible Duct
Insulated flexible duct combines the flexible air duct with a thermal insulation layer.
It can be useful when transporting conditioned air where heat transfer and condensation need to be controlled.
Potential applications include:
- Air-conditioning systems
- Supply-air distribution
- Ceiling spaces
- Commercial buildings
- Residential HVAC
- Selected ventilation systems
The exact insulation material and thickness depend on the specific product.
Contact Kingsman for current product specifications and availability.
Non-Insulated 6-Inch Flexible Duct
Non-insulated flexible duct does not incorporate a thermal insulation layer.
It may be appropriate for applications where insulation is not required, including certain:
- Ventilation systems
- Exhaust systems
- Short duct connections
- Indoor air-distribution applications
The choice should be based on the application rather than simply the duct diameter.
6-Inch Flexible Duct Construction
Flexible ducts can have different constructions depending on their intended application.
A product may contain:
- Flexible inner liner
- Reinforcing wire
- Insulation layer
- Outer jacket
- Reinforced connection section
Different manufacturers and product series can have different:
- Materials
- Temperature ratings
- Pressure ratings
- Insulation thicknesses
- R-values
- Maximum air velocities
- Installation requirements
Therefore, Kingsman will confirm the actual specification of the product available at the time of quotation.
6-Inch Flexible Duct Technical Considerations
When selecting 6-inch flexible duct, consider the following.
Nominal Diameter
Approximately 6 inches / 150 mm.
Required Airflow
The duct must be appropriately sized for the required airflow.
Duct Length
Longer runs generally create greater pressure loss.
Bends
Sharp bends can increase resistance.
Compression
Compression reduces the effective flow area.
Sagging
Excessive sag can increase resistance and affect airflow.
Temperature
The duct construction must be suitable for the air temperature.
Pressure
The product should be compatible with the system’s static pressure.
Installation Environment
Consider whether the duct is installed:
- Above a false ceiling
- Inside a plant room
- Within an office
- In a commercial building
- In an industrial environment
- In an exposed location
How Much Air Can a 6-Inch Flexible Duct Carry?
This is one of the most important questions customers ask.
There is no single CFM value that applies to every 6-inch flexible duct installation.
The actual airflow depends on:
- Duct diameter
- Duct length
- Air velocity
- Friction
- Static pressure
- Number of bends
- Duct construction
- Compression
- Sagging
- Connection quality
- HVAC equipment
A properly engineered HVAC system should therefore determine the duct size from the required airflow and acceptable pressure loss.
Important
Do not choose a 6-inch duct simply because someone has given you a generic CFM number.
For a project, the safest approach is to follow the mechanical design or provide Kingsman with the equipment specification and required airflow.
6-Inch Flexible Duct vs 4-Inch Flexible Duct
The difference in diameter also changes the available cross-sectional area.
| Feature | 4-Inch | 6-Inch |
|---|---|---|
| Approx. nominal diameter | 100 mm | 150 mm |
| Cross-sectional area | Smaller | Larger |
| Potential airflow | Lower, depending on design | Higher, depending on design |
| Space requirement | Lower | Higher |
| Typical use | Smaller connections | Larger connections/applications |
A 6-inch duct should not automatically replace a 4-inch duct or vice versa.
The HVAC system determines the appropriate diameter.
6-Inch Flexible Duct vs 5-Inch Flexible Duct
| Feature | 5-Inch | 6-Inch |
|---|---|---|
| Approx. diameter | 125 mm | 150 mm |
| Cross-sectional area | Smaller | Larger |
| Potential airflow | Lower, depending on design | Higher, depending on design |
| Space requirement | Lower | Higher |
| Typical application | Smaller connections | Larger connections |
The actual airflow performance depends on the complete system and installation.
6-Inch Flexible Duct vs Rigid Duct
Flexible duct and rigid duct can serve different functions within the same HVAC system.
Flexible duct
Useful for:
- Final connections
- Areas with obstacles
- Short flexible runs
- Connections to grilles and diffusers
- Installations where flexibility is required
Rigid duct
Commonly used for:
- Main duct routes
- Larger distribution systems
- Permanent duct runs
- Engineered air-distribution systems
A common arrangement is:
Rigid main duct → branch duct → flexible final connection → grille/diffuser
How to Install 6-Inch Flexible Duct
Correct installation can have a major effect on performance.
Step 1: Confirm the Diameter
Confirm that 6 inches / approximately 150 mm matches the intended connection and design.
Step 2: Plan the Route
Keep the duct route as direct as practical.
Step 3: Avoid Sharp Bends
Use smooth changes of direction.
Step 4: Avoid Compression
Do not crush or flatten the duct during installation.
Step 5: Support the Duct
Provide appropriate support to reduce excessive sagging.
Step 6: Secure Connections
Use appropriate connection and fastening methods.
Step 7: Seal Joints
Air leakage at connections can reduce system performance.
Step 8: Inspect the Installation
Look for:
- Kinks
- Crushing
- Sagging
- Tears
- Loose connections
- Unsealed joints
Common 6-Inch Flexible Duct Installation Mistakes
Excessive bends
Creates additional resistance.
Excessive length
Adds unnecessary pressure loss.
Poor support
Can cause sagging.
Crushing
Reduces the effective flow area.
Incorrect diameter
Can result in excessive resistance or inadequate airflow.
Poor sealing
Can allow conditioned air to escape.
Incorrect product selection
A duct intended for one application may not be suitable for another temperature, pressure or environment.
How to Measure for 6-Inch Flexible Duct
When replacing an existing duct, start by checking the connection.
Measure the diameter
Confirm the nominal connection size.
Measure the route
Measure the actual required length rather than simply measuring between two points.
Check insulation
Determine whether the existing duct is insulated.
Identify the connected equipment
For example:
- Grille
- Diffuser
- Fan
- HVAC unit
- Branch duct
- Ventilation equipment
Take photographs
Photographs can help when requesting a replacement.
Send Kingsman the available measurements and photographs if you are unsure what product you need.
6-Inch Flexible Duct for Commercial HVAC Projects
6-inch flexible duct can form part of HVAC installations in:
- Offices
- Hotels
- Restaurants
- Shopping centres
- Schools
- Hospitals
- Retail stores
- Commercial buildings
- Institutional facilities
For project procurement, Kingsman recommends submitting the BOQ, HVAC drawing or mechanical schedule.
This allows the required sizes and quantities to be reviewed against the project requirements.
6-Inch Flexible Duct for Residential HVAC
Potential residential applications include:
- Houses
- Apartments
- Villas
- Residential developments
- Selected air-conditioning systems
- Ventilation systems
The appropriate duct diameter should still be determined from the required airflow and system design.
6-Inch Flexible Duct for HVAC Contractors
Contractors ordering 6-inch flexible duct should provide:
- Diameter
- Insulated/non-insulated requirement
- Required length
- Quantity
- Application
- Project location
- Technical specification, if available
For bulk orders, send your BOQ or material schedule to Kingsman.
6-Inch Flexible Duct Supplier in Nairobi
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Contact Kingsman Engineering & Industrial Insulation Ltd.
We are developing a comprehensive HVAC product range for customers across Kenya and East Africa.
Call / WhatsApp:
0722 209 507
0721 953 570
6-Inch Flexible Duct Supplier Across Kenya
Kingsman supplies HVAC and related engineering products to customers in:
- Nairobi
- Mombasa
- Nakuru
- Kisumu
- Eldoret
- Thika
- Kiambu
- Naivasha
- Machakos
- Meru
- Other locations across Kenya
Delivery depends on product availability, quantity and destination.
Contact us to confirm current stock and delivery arrangements.
6-Inch Flexible Duct Supplier in East Africa
Kingsman Engineering & Industrial Insulation Ltd is a leading importer and supplier of HVAC, refrigeration and insulation products in Kenya and East Africa.
We can discuss supply requirements for customers and projects in:
- Kenya
- Uganda
- Tanzania
- Rwanda
- South Sudan
- Other East African markets
For regional projects, send your BOQ, product list or technical specification to:
Why Choose Kingsman Engineering for 6-Inch Flexible Duct?
Leading HVAC Supplier
Kingsman Engineering is positioned as a leading importer and supplier of HVAC products in Kenya and East Africa.
Comprehensive HVAC Range
Our HVAC portfolio is being developed across:
- Air distribution
- Flexible ducting
- Grilles
- Diffusers
- Ventilation
- Air curtains
- HVAC insulation
- Refrigeration
- Air-conditioning installation materials
Project Supply
Contractors and procurement teams can submit BOQs, drawings and specifications.
Technical Product Guidance
We aim to help customers identify the appropriate product according to their application and available specifications.
Kenya and East Africa
We supply customers throughout Kenya and support regional East African requirements, subject to product availability and logistics.
Related HVAC Products from Kingsman
A 6-inch flexible duct installation may also require:
- HVAC grilles
- Double deflection grilles
- HVAC diffusers
- Inline duct fans
- Extractor fans
- Axial fans
- Air curtains
- HVAC dampers
- Armaflex insulation
- Fiberglass insulation
- Rockwool insulation
- Aluminium insulation tape
- Copper pipes
- Refrigerants
- Vacuum pumps
- Refrigeration accessories
Explore the complete HVAC Products in Kenya range from Kingsman Engineering.
Frequently Asked Questions About 6-Inch Flexible Duct
1. What is a 6-inch flexible duct?
A 6-inch flexible duct is a flexible air duct with a nominal diameter of approximately 6 inches, commonly identified as approximately 150 mm in metric HVAC sizing.
2. What is 6-inch flexible duct in millimetres?
A 6-inch duct is approximately 150 mm nominal size.
Mathematically, 6 inches equals 152.4 mm, so always confirm the actual product dimensions before ordering.
3. What is 6-inch flexible duct used for?
It can be used for suitable HVAC, air-conditioning, ventilation, air-distribution and exhaust applications.
4. Can 6-inch flexible duct be used for air conditioning?
Yes, where the HVAC design specifies an appropriate airflow and connection size.
5. Can 6-inch flexible duct be used for ventilation?
Yes. It can be suitable for ventilation, air extraction and fresh-air applications where its construction meets the system requirements.
6. Can 6-inch flexible duct be insulated?
Yes. Insulated flexible duct products can be available in this nominal size depending on the manufacturer and current product availability.
7. What is the difference between insulated and non-insulated duct?
Insulated duct includes a thermal insulation layer around the air-carrying duct, while non-insulated duct does not.
8. How much air can a 6-inch flexible duct carry?
There is no universal airflow figure.
The appropriate airflow depends on duct diameter, length, air velocity, pressure, bends, construction and installation.
9. Can I use 6-inch duct instead of 4-inch duct?
Not automatically.
The larger diameter changes the system’s airflow characteristics and should be selected according to the HVAC design.
10. Can I use 6-inch duct instead of 8-inch duct?
Not without checking the system design.
Reducing duct diameter can increase resistance and affect airflow.
11. Can 6-inch flexible duct connect to a diffuser?
Yes, where the diffuser connection and HVAC design are compatible.
12. Can 6-inch flexible duct connect to an extractor fan?
It can be used with compatible fans where the connection diameter, airflow, pressure and temperature requirements are appropriate.
13. Can flexible duct be installed above a false ceiling?
Yes, flexible duct is commonly used in ceiling spaces where suitable.
It should be properly routed and supported.
14. Does flexible duct need support?
Yes. Appropriate support helps prevent excessive sagging and deformation.
15. Can 6-inch flexible duct be used for exhaust air?
Suitable flexible duct products can be used for exhaust applications, provided the material is appropriate for the exhaust temperature and operating conditions.
16. Does the length of flexible duct affect airflow?
Yes.
Longer runs generally create greater resistance than shorter runs, all else being equal.
17. Do bends affect airflow?
Yes.
Sharp or excessive bends can increase pressure loss.
18. What causes flexible duct to collapse?
Possible causes include:
- Excessive compression
- Poor support
- Improper installation
- Excessive bending
- Inappropriate product selection
- External mechanical pressure
19. How do I measure 6-inch flexible duct?
Measure the connection diameter and determine the required length along the actual installation route.
For replacements, photographs are useful.
20. Where can I buy 6-inch flexible duct in Kenya?
Contact Kingsman Engineering & Industrial Insulation Ltd for current availability, specifications and pricing.
21. Does Kingsman supply 6-inch flexible duct in Nairobi?
Contact Kingsman to confirm the current product availability and quotation.
22. Can Kingsman supply 150mm flexible duct outside Nairobi?
Supply and delivery arrangements can be discussed depending on product availability, order quantity and destination.
23. Do you supply flexible duct to contractors?
Yes. Contractors, HVAC technicians, engineers, businesses and project procurement teams can request quotations.
24. Can I order 6-inch flexible duct in bulk?
Yes. Send your required quantity or BOQ for quotation.
25. Can Kingsman help me determine the correct duct size?
Yes.
Provide the equipment details, connection dimensions, airflow requirement, HVAC drawing, BOQ or photographs where available.
26. What other HVAC products does Kingsman supply?
Kingsman’s expanding HVAC range includes flexible ducts, grilles, diffusers, ventilation products, air curtains, HVAC insulation and related refrigeration and air-conditioning materials.
27. Can I send my HVAC BOQ to Kingsman?
Yes.
Send your BOQ or material schedule to:
info@kingsmanengineering.co.ke
Or contact:
0722 209 507 | 0721 953 570