A duct flange 20mm is a profile rail fixed to rectangular duct ends so sections bolt or clamp together.
Use it with 20 mm duct corners and G-clamps. Seal the joint with gasket or sealant.
What is a duct flange 20mm?
Rectangular ducts are often joined with a flange system. A flange profile is fixed to each duct end, corners lock the profiles together, and the corner bolts pull two sections tight. G-clamps then hold the long sides, and a gasket or sealant makes the joint airtight.
Profiles come in sizes such as 20, 25 and 30 mm, chosen by duct size and pressure. Therefore, flanges, corners and clamps must all be the same profile size.
Further reading
- Air ducts (Wikipedia)
- HVAC systems (Wikipedia)
- Sheet metal (Wikipedia)
Key terms explained
- Flange profile
- A formed steel rail fixed to a duct end for joining.
- Duct corner
- A corner piece that links four flange rails and takes a bolt.
- G-clamp
- A clip that holds two flanges together along the sides.
- Galvanized sheet
- Zinc-coated steel used to make ducts.
Features and benefits
- Fast, strong duct joints.
- Profiles in 20, 25 and 30 mm.
- Matching corners and clamps.
- Galvanized for corrosion resistance.
Technical specifications
| Product | Duct flange |
|---|---|
| Profile | 20 mm |
| Material | Galvanized steel, confirm with quote |
| Length | Confirm with quote |
| Supplier | Sparks Plumbing Experts Ltd, Nairobi |
| Supplier | Sparks Plumbing Experts Ltd, Nairobi |
Sizes, grades and ratings depend on stock and model. Tell us what you need, and we will confirm before you order.
Applications of a duct flange 20mm
- Office ductwork. Supply and return ducts.
- Kitchen extract ducts. Rigid ducts behind hoods.
- Malls and hotels. Large duct networks.
- Hospitals. Ventilation ducts.
- Factories. Process extract ducts.
- Air handling units. Connections to AHUs.
- Car park ventilation. Large ducts.
- Duct repairs. Replacing damaged joints.
How to choose and install
- Use the same profile size for flanges, corners and clamps.
- Choose larger profiles for bigger ducts.
- Seal joints with gasket or sealant.
- Support ducts with hangers at regular spacing.
Why choose Sparks Plumbing Experts
- Fans in several sizesInline duct fans and box fans come in a range of diameters, so you can match airflow to the room.
- PVC and metal optionsChoose corrosion-resistant PVC for humid rooms or metal housings for tougher conditions.
- Grilles and diffusers tooDiffusers, louvers and grilles finish the system you are ventilating.
- Sizing guidanceTell us the room size and duct route, and we help you pick a fan with enough airflow.
- Visit or collect in NairobiOur store is at KCB Building, Enterprise Road, in the Industrial Area, so you can see parts before you buy or collect your order.
- Quotes your wayAsk for prices by phone, WhatsApp, email or the online quote form, whichever suits you on site.
- Over 1,600 products in one placeOur catalogue covers 55 categories, so one supplier can handle most of your parts list.
- Help choosing the right partSend a nameplate photo, a drawing or the old part, and we help you match size and specification.
- Single items or project quantitiesWe price a single replacement part just as readily as a full site order.
- Supply across East AfricaWe serve customers across Kenya. We also supply buyers in Uganda, Tanzania, Zanzibar, Rwanda, Burundi, DR Congo, Ethiopia and South Sudan.
Related products and accessories
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Ordering from Sparks Plumbing Experts
We supply customers across Kenya. We also serve buyers in Uganda, Tanzania, Zanzibar, Rwanda, Burundi, DR Congo, Ethiopia and South Sudan. You can collect from our store at KCB Building, Enterprise Road, Nairobi, or ask us about delivery to your site. Send your quantities and specifications, and we will reply with prices and availability.
Request a Quote WhatsApp 0726 086 895
Frequently asked questions
Which corner fits a 20mm duct flange?
A 20 mm duct corner.
What details do you need to quote duct fittings?
Tell us the item, size, quantity and, for sheets or panels, the area or dimensions. A photo of the old part, a nameplate or a drawing also helps. Then call or WhatsApp 0726 086 895, or use the quote form on this page.
Do you deliver duct fittings outside Nairobi?
Yes. We supply customers across Kenya. We also serve buyers in Uganda, Tanzania, Zanzibar, Rwanda, Burundi, DR Congo, Ethiopia and South Sudan. Delivery or courier arrangements are agreed when you confirm the order.
How much does a duct fitting cost in Kenya?
The price depends on the item, size and quantity. Therefore, send your list with a quote request and we will reply with current figures.
Which profile size do I need?
It depends on duct size and pressure. Ask us.
Are the parts galvanized?
Most are. Confirm with the quote.
How many clamps per joint?
Space them along long sides as the design needs.
Do you sell duct sheet in gauges?
Yes, confirm gauge and size.
Do joints need sealant?
Yes, for airtight ducts.
Where can I buy duct flange 20mm in Kenya?
Buy it from Sparks Plumbing Experts Ltd at KCB Building, Enterprise Road, Industrial Area, Nairobi. We are open Monday to Friday, 8 am to 5 pm, and Saturday, 9 am to 12 noon. You can also order by phone or WhatsApp on 0726 086 895. We deliver across Kenya and to Uganda, Tanzania, Zanzibar, Rwanda, Burundi, DR Congo, Ethiopia and South Sudan.
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Prices change with size, model and quantity. Request a quote from Sparks Plumbing Experts for current figures.
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