Flexible duct connects fans, diffusers and grilles where rigid duct is hard to route.
Keep runs short and avoid kinks. Choose the diameter you need.
What is a flexible duct?
Ducts carry air between fans, rooms and the outside. Flexible ducts bend round obstacles and connect diffusers, while rigid ducts carry larger air volumes over longer runs.
Grilles and louvers finish the system. Double deflection grilles have two sets of blades to direct air up, down and sideways, and louvers let air in or out while keeping rain out.
Further reading
- Air ducts (Wikipedia)
- Louvers (Wikipedia)
- Ventilation in buildings (Wikipedia)
Key terms explained
- Flexible duct
- A bendable duct, often aluminium foil or PVC on a wire spiral.
- Double deflection grille
- A grille with two sets of adjustable blades.
- Airflow (m3/h or CFM)
- How much air a fan moves. 1 m3/h is about 0.59 CFM.
- Static pressure
- The resistance a fan must push against from ducts, filters and grilles, in pascals (Pa).
- Air changes per hour (ACH)
- How many times the air in a room is replaced each hour.
Features and benefits
- Flexible and rigid duct options.
- Adjustable grilles.
- Weather louvers.
- Common sizes in stock.
Technical specifications
| Product | Flexible duct |
|---|---|
| Sizes | Confirm diameter and length |
| 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 flexible duct
- AC diffuser connections. Flexible duct to diffusers.
- Bathroom extract. Duct runs to outside.
- Kitchen extract. Ducts behind hoods.
- Office supply air. Grilles in walls and ceilings.
- Plant room intake. Louvers for fresh air.
- Generator rooms. Intake and exhaust louvers.
- Dryer venting. Flexible duct for dryers.
- Return air. Grilles for return paths.
How to choose and install
- Match duct size to the fan and diffuser.
- Keep flexible ducts short and straight.
- Seal joints with tape and clamps.
- Choose louvers with insect mesh where needed.
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, and we also supply buyers in Uganda and Tanzania.
Related products and accessories
Browse more: Ventilation · HVAC · Electricals · Louvers.
Ordering from Sparks Plumbing Experts
We supply customers across Kenya, and we also serve buyers in Uganda and Tanzania. 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
What details do you need to quote ducts and grilles?
Tell us the space size and use, duct size and length, power supply, or the model you are replacing. 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 ducts and grilles outside Nairobi?
Yes. We supply customers across Kenya, and we also serve buyers in Uganda and Tanzania. Delivery or courier arrangements are agreed when you confirm the order.
How much does a duct cost in Kenya?
The price depends on the type, size, motor and quantity. Therefore, send your list with a quote request and we will reply with current figures.
Can flexible duct be long?
Keep it short, because long runs add resistance.
Do you sell insulated flexible duct?
Yes, see our insulation range.
How do I size a grille?
Measure the opening and check airflow.
Do louvers keep rain out?
Weather louvers reduce rain entry. Add mesh for insects.
How are ducts joined?
With connectors, clamps and tape.
People also search for
flexible vs rigid duct
Flexible duct is easy to fit. Rigid duct has lower resistance on long runs.
flexible duct sizes
Common sizes include 4, 6, 8, 10, 12 and 14 inch.
double deflection grille sizes
Sized by face dimensions. Measure the opening.
Ducts and grilles price in Kenya
Prices change with size, model and quantity. Request a quote from Sparks Plumbing Experts for current figures.
axial vs centrifugal fan
Axial fans move lots of air at low pressure. Centrifugal fans push against ducts and filters.
how to size a ventilation fan
Room volume times air changes per hour gives the airflow. Then allow for duct resistance.
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