A Comprehensive Guide to Spiral Duct Fittings
Spiral duct fittings are essential components in HVAC systems. It helps to direct airflow efficiently. This guide provides a clear and straightforward explanation of these fittings, their uses, and benefits. It does not matter if you are a professional or a DIY enthusiast. Here is a comprehensive guide to spiral duct fittings. Must read this guide, I hope you will find this helpful.
A Comprehensive Guide to Spiral Duct Fittings:
Spiral ducting is a round duct made from spirally wound sheet metal. It is cost-effective because it uses a third less metal than rectangular ducting.
It also leaks less due to fewer joints when run in long, straight sections. Spiral ducting is strong and is used in heating and ventilation. It includes the air conditioning, commercial kitchens, and dust and fume extraction.
Plastic ducting is lighter and resistant to corrosion, making it useful where corrosion is a concern. It has been easier to install in the past.
For example, the smooth interior walls of spiral ducting reduce friction and offer a better seal. Its rounded shape fits into tighter spaces more easily. Exposed spiral ductwork gives a professional space a modern look. Additionally, its design with shallower angles helps maintain airspeed, ensuring efficient airflow.
Spiral duct fittings Types:
There are three main types of spiral duct fittings: single wall, double wall, and insulated double wall. Each type offers unique features and benefits for cost-effective and efficient HVAC solutions.
Single-wall spiral duct fittings:
Single-wall spiral duct fittings have a smooth interior and can be insulated without a core. They seal easily, save energy, and look better than bulky rectangular ducts.
Double wall spiral duct fittings:
Double wall spiral duct fittings are also known as dual wall. These are used in exposed areas like industrial settings. They provide noise and temperature control.
Insulated double-wall spiral duct fittings:
Insulated double-wall spiral duct fittings are ideal for long HVAC systems of various sizes. They are strong, durable, energy-efficient, and visually appealing.
Advantages of Spiral Ducting:
The advantages of spiral ducting are given here:
Low cost. It is made efficiently with minimal material.
Low air leakage performs well in pressurized systems.
Strong and durable.
Attractive appearance.
Easy to install and seal.
Familiar with duct designers, architects, and quantity surveyors.
Compatible with a wide range of accessories.
Disadvantages of Spiral Ducting:
Here are the disadvantages of spiral ducting:
Logistics: Spiral ducting can be challenging to transport due to its size.
Connecting: Sealing spiral ducting properly can take time, and it can take longer to connect compared to plastic ducting. However, our Ducting, with rolled edges, clips together quickly, combining the benefits of spiral ducting with easy connection.
Dimensions of Spiral Ducting:
Spiral ducting dimensions include diameter and length.
The diameter ranges from
80mm to 1250mm, with standard sizes available:
80mm
100mm
125mm
150mm
160mm
180mm
200mm
224mm
250mm
280mm
300mm
315mm
355mm
400mm
450mm
500mm
560mm
600mm
630mm
710mm
800mm
900mm
1000mm
1120mm
1250mm
The typical length is 3 meters, ideal for long runs and safe bracketing during installation.
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What are the most common spiral ducting fittings?
Bends: Available in 30, 45, 60, and 90 degrees for turning corners.
Access doors: Allow access for cleaning or equipment maintenance inside ducts.
Bird beaks: Air outlets with a mesh to prevent rain and animals from entering.
Blast gate dampers: Gate valves used in dust extraction systems.
Cap ends: Used to close off the end of ducts.
Meshed cap ends: Caps with mesh for airflow.
Circular flange rings: Join ducting without sealant and screws.
Sound attenuators: Silencers for ducting.
Cloaking plates: Cover the area around ducting passing through walls.
Concentric reducers: Reduce the size of ducting along a run.
Male/female connectors: Male connectors join spiral pipes; female connectors join fittings like bends, reducers, and T-pieces.
Curved boots: Add branches to spiral ducting runs at a 90-degree angle.
Cut in collar saddles: Add branches to duct runs at a 45-degree angle.
Dektites: Create weatherproof seals for ducting, pipes, and flues on roofs.
Flat bar flanges: Connect spiral ducting to a flange with a top hat spigot.
Flat shoes: Branch off a circular duct from a square duct.
Inline duct heaters: Heat the air passing through ductwork.
Grilles: Provide airflow into rooms.
Louvres: Resist rain with angled blades.
Inline filter boxes: Filter air within ducting.
Pressed saddles: Enable duct branching.
Rocket boosters: Split duct runs into three or more smaller branches.
Split clips: Bracket ducting.
Suspension clips: Hang ducting from ceilings.
Swedish cowls: Vertical duct terminals to prevent rain entry.
T pieces: Branch ducting at 45 and 90-degree angles.
Top hat spigots: Connect ducting to flat surfaces.
Weather collars: Prevent water from entering buildings around duct exits.
Weather cowls: Stop rain, snow, and birds from entering ducting.
Y-pieces: Y-shaped ducting branches.
FAQs:
How far apart should spiral duct hangers be placed?
That explains the recommendation of placing supports 8 to 10 feet apart when installing 4 and 5-foot joints of rectangular duct. Round spiral duct, typically provided in lengths of 10 feet or more, requires fewer joints and thus fewer supports. Another important factor to consider is the weight of the duct.
How does a spiral pipe connect?
Slip joints are the easiest way to join a spiral pipe. For fitting-to-fitting connections (male to male), use a separate coupling, C-1-F, or a short, hand-cut section of spiral pipe that can serve as a quick, in-the-field coupling.
Do you crimp a spiral duct?
No, common hand tools aren't sufficient. Due to the heavy gauge and reinforced spiral beading of the pipe, it requires a motorised press for crimping. It’s much easier to use Oneida Air Systems' spiral pipe adapters to join spiral pipe components.
Conclusion:
Spiral duct fittings are essential for effective HVAC systems. They provide strength, a modern look, and easy installation. You should know about the different types, benefits, and common fittings that will help you make the right choices for your ductwork. This guide is useful for both professionals and DIY enthusiasts to ensure reliable and efficient ducting.