Aluminium Semi Flexible Air Ducting

Name: Aluminium Semi Flexible Air Ducting
Brand: Auto Silicone Hoses
SKU: FAD076-ASH#2
Price: 14.11 GBP
Availability: InStock
Rating: 5.0 (3 reviews)

FAD076-ASH#2

£14.11

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Mirfield WF14 8NA
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Aluminium semi-flexible air ducting is a type of duct work commonly used in heating, ventilation, and air conditioning HVAC systems. It is made from aluminium, which makes it lightweight and flexible, allowing for easy installation in various applications.

Ducts are designed for flexible connections between specific ventilation system components, e.g. the main ventilation ducts and plenum boxes. They can also be used for hot air exhaust connections between fireplace fireboxes and for building air heating duct work.

Round ducting has the most effective airflow performance and should be considered as the first option, if space will allow. Connects to extractor fans, cooker hoods and other diameter systems.

The use of aluminium in the construction of the ducting provides a balance between flexibility and durability. Aluminium is resistant to corrosion, which is important for HVAC systems where the ducting may be exposed to different environmental conditions.

This type of ducting is not as rigid as traditional ducts, offering some degree of flexibility. It can be bent and shaped to accommodate the specific layout and requirements of the HVAC system.

While aluminium is generally resistant to temperature variations, it's essential to ensure that the specific ducting used is suitable for the temperature range expected in the HVAC system.

The interior surface of the ducting is typically smooth, promoting efficient airflow. However, care should be taken during installation to avoid sharp bends and kinks that could impede airflow.

The flexibility of the ducting makes it relatively easy to install, especially in situations where rigid ducts might be challenging to fit. However, care should be taken to avoid sharp bends that could restrict airflow.

When using aluminum semi-flexible air ducting, it's important to follow manufacturer guidelines and local building codes to ensure proper installation and compliance with safety standards. Additionally, regular maintenance is crucial to ensure the optimal performance of the HVAC system.

PLEASE NOTE - This is sent as a compressed length of 1 metre, however when stretched is the full 4 metres

Specifications

Type: Aluminium Ducting
Material: Aluminium
Colour: Silver
Standard: EN13501-1
Wall Thickness: 3mm
Bending Radius: 0.76 x D

Size Guide

Inside Diametermm	Outside Diametermm	Coil Lengthm
76	84	2
102	110	4
125	133	4
150	158	4

Measurements are nominal and may vary slightly.

How to measure ID

Measure the pipe, not the old hose

Heat and age make a used hose swell and go out of round. Take your reading across the metal outlet the hose slides onto — that measurement is your ID.

Use vernier calipers

Set the outer jaws across the widest point of the pipe. A tape measure round a curve reads low by a millimetre or two — enough to buy the wrong size.

Take three readings, keep the largest

Rotate 60° between each. If they disagree the pipe is oval; size to the biggest figure so the hose still seals.

Round to the nearest listed bore

Never go up: a bore wider than the fitting will not grip, whatever the hose is made of. If you land between listed sizes take the smaller bore, and secure it with a clip.

Order by ID, always. Every hose on this site is listed by internal diameter. OD is given for clearance only — it changes with wall thickness and ply count, so it is never the ordering size. On reducers, quote both ends, largest first.

Aluminium Semi Flexible Air Ducting

✅ -30°C to +150°C ✅ Lightweight ✅ Low Resistance

Frequently Asked Questions.

Answers to the questions we’re asked most about sizing, fitment and performance.

Still can't find your answer?

What is it used for?

Heating, ventilation and air conditioning runs, cooker hood and bathroom extraction, warm air distribution, and vehicle and workshop ventilation. Being semi-rigid, it holds the shape you bend it to.

What sizes and lengths do you stock?

Available in internal diameters from 76mm to 150mm, lengths from 2 Metres to 4 Metres. Order by internal diameter to match the spigot or machine outlet it connects to.

What temperature will it take?

-30C to +150C, manufactured to EN 13501-1. For genuinely hot air - engine exhaust or process air above that - you need silicone glass fibre ducting, which is rated -70C to +310C.

Can it be used on the suction side of a fan?

Yes - semi-rigid aluminium ducting is self-supporting and holds its bore, so it works on both the pressure and suction sides of a fan.

How do I cut it to length?

Snips or tin snips, cutting carefully round the profile. Wear gloves - cut aluminium ducting leaves sharp edges. Dress the cut end before fitting so it cannot cut into a seal.

How do I join lengths together?

Use a duct connector sized to the bore and secure each side with a worm drive clip or ducting clamp. We stock ABS male and reducing connectors for PU ducting in 50mm to 200mm outside diameter, covering 20 reducing pairings.