What is a spiral duct?
Spiral duct has always been green — long before the term came into being. The spiral duct industry started in Northern Europe at the end of World War II. As economies recovered, new and better buildings were incorporating ventilation and conditioning systems that had been developed during the previous few decades.
What is spiral and how does it work?
The Spiral website presents Spiral as a powerful educational tool, and aims to explain and raise awareness of the impact of using technology within the classroom, emphasising that use of this platform “empowers teachers, engages learners”, and to illustrate the transformational affordances of their software. The perceived empowerment for…
Who is spiral manufacturing company?
Spiral Manufacturing Co., Inc. is a leader among spiral duct manufacturers, offering spiral pipe and high pressure products in various forms for your project and industrial needs, including high pressure galvanized pipe, low pressure galvanized pipe, and PVS underground pipe.
Why choose spiral pipe?
We manufacture to match or surpass all standards set forth by the Sheet Metal and Contractors National Association (SMACNA). Spiral pipe is a workhorse in the modern HVAC, aerospace, and manufacturing industries. Engineers who chose spiral pipe gain the benefits of a spiral lockseam construction, ensuring maximum rigidity and strength.
How do you use a spiral air conditioner?
1:5818:03How to use Spiral.ac - YouTubeYouTubeStart of suggested clipEnd of suggested clipOkay so let's start then so first thing you need to do you need to go to spiral dot and you willMoreOkay so let's start then so first thing you need to do you need to go to spiral dot and you will need to create an account it's free. So once you create your account.
What are spiral assessments?
Spiral assessments will ensure that a student's grade reflects their current understanding. If a student fails a test on adding fractions and we never give them another opportunity to demonstrate their understanding as they learn and grow, is that test grade a true reflection of their ability level?
What are spirals for school?
Spiral notebooks are an essential school supply for students of all ages. They are a convenient way to keep all of your notes organized in a single book, either for a single class or multiple classes. It's also a basic need if you often write ideas for work or just jotting down your thoughts.
What is the spiral shape?
A spiral is a shape which winds round and round, with each curve above or outside the previous one.
What is spiral questioning?
The process, sometimes called the spiral questioning technique or detective analogy, allows teachers to query students with simple questions that build towards the complex. The pattern uses questions that are leveled (1=knowledge/comprehension, 2=application/analysis, 3=synthesis/evaluation).
What size is a spiral notebook?
In the United States a "regular size spiral bound notebook" is generally 10.5 inches long. But like most things, this is not always the case. The Five Star Wirebound College Ruled1 Subject Notebook measures 7 inches tall by 5 inches wide. What are the dimensions of some smaller sized notebooks?
Are spiral notebooks better?
And if you have ever tried writing on the go – writing with the book on your lap say – then a spiral bound notebook will win everytime. Usually they will have a hard, sturdy cover and you can fold the cover and pages round to the back creating a solid surface to write on.
How many pages is a spiral notebook?
Chipboard backing makes the pages easy to write on. Just Basics spiral notebook is wide ruled with 140 pages (70 sheets).
Spiral Manufacturing – Your Premier Spiral Duct Suppliers
Spiral Manufacturing Co., Inc. is a leader among spiral duct manufacturers, offering spiral pipe and high pressure products in various forms for your project and industrial needs, including high pressure galvanized pipe, low pressure galvanized pipe, and PVS underground pipe.
Spiral Pipe for Many Applications
Spiral pipe is a workhorse in the modern HVAC, aerospace, and manufacturing industries. Engineers who chose spiral pipe gain the benefits of a spiral lockseam construction, ensuring maximum rigidity and strength. Not only does it offer exceptional structural strength, spiral ductwork requires fewer hangers and joints.
Superior Service for Your Spiral Pipe and Duct Needs
As a leader among HVAC duct manufacturers, our team is able to handle a wide variety of projects involving spiral pipe and duct needs. We are dedicated to delivering solutions that help optimize your operations and productivity.
What is a spiral duct?
Spiral round lock-seam duct is the most efficient way to transport air in HVAC systems. The round profile greater flow efficiencies than rectangular ducts. Because round ducts are inherently stronger than rectangular profiles, they can be lighter metal gauges and can be installed in longer spans. The 4-ply spiral lock-seams of “spiral duct” create a product that is stronger than traditional welded-seam round ducts of the same gauge. Spiral lock-seams have practically no leakage, and are the only mechanical seams exempted from sealing under energy standards such as ASHRAE Standard 90.1-2013.
Where did spiral ducting start?
The spiral duct industry started in Northern Europe at the end of World War II. As economies recovered, new and better buildings were incorporating ventilation and conditioning systems that had been developed during the previous few decades. But they had three problems — energy was expensive, raw materials were also expensive and often in short supply, and there was a shortage of skilled labor with so many young men lost in the war. To solve all three problems, spiral ducts were developed. Round is the most efficient shape for transporting air. It has lower pressure drops, saving fan horsepower, and there is less heat gain/loss through the surface than with rectangular shapes.
What gauge is spiral pipe?
We make diameters ranging from 3” to 92” and metal thicknesses from 26 gauge to 16 gauge. The following is our construction standard for positive pressures to +10” WG.
How long is a standard spiral duct?
Where rectangular duct is normally provided in 4 or 5 foot nominal lengths, the standard for spiral duct is 10 feet with lengths as much as 20 feet commonly provided.
Why are roof ducts round?
Rooftop duct should always be round when possible. The round shape sheds rainwater and prevents excessive snow and ice loads. But for most of the country the main reason is wind. A round duct experiences only about 40% of the wind force a comparable rectangular duct would see. Hanger and support spacings are greater for round ducts. And this is truly a round duct, not an 8 or 12-sided adaptation from rectangular duct. Our standard construction uses our spiral duct as the outer shell and a round metal longitudinal-seam duct for the inner shell. Your performance is the same as for our other round duct products.
Which shape of duct is the most efficient for transporting air?
To solve all three problems, spiral ducts were developed. Round is the most efficient shape for transporting air. It has lower pressure drops, saving fan horsepower, and there is less heat gain/loss through the surface than with rectangular shapes. Round is also the strongest shape for transporting air.
Do you have to seal the longitudinal seams of a rectangular duct?
First of all, you have to seal the longitudinal seams of the rectangular duct. You don’t have to seal the spiral lockseams of the spiral ducts. That is specifically stated in the ASHRAE standard, and testing has confirmed that spiral seam leakage is negligible — between a Duct Leakage Class of 0.02 and 0.3.
What is spiral duct?
Spiral duct is an often specified and commonly known duct pipe style. As the name implies, the duct is formed by spiraling and locking strips of metal together to form a continuous piece. This forming method enables the manufacturer to produce various lengths of duct in less time, creating a duct that is typically less expensive than duct formed by rolling sheets. Yet, when considering ductwork options for your customers and looking at the entirety of the project from design, manufacturing, shipping, installation and ongoing maintenance, spiral duct may not be the best solution. Consider the information below and the possible alternative of Clamp Together Duct as a better solution.
How is spiral duct formed?
None of them are easy. Flanges/Angle Rings- The problem with this process is that spiral duct is formed by locking edges of the metal together. This creates spirals of 4 thicknesses of metal.
Is clamp together duct cheaper than spiral duct?
And while the straight duct is cheaper, the branches, elbows and other fittings are no cheaper than other systems. Clamp Together Duct pipe is more expensive than spiral duct but usually, the difference in price is only in the straight duct. The fittings are approximately the same price.
Is spiral duct good for industrial use?
Spiral duct has been around a long time and if you have used it regularly, you are likely comfortable with the benefits - or at least the apparent benefits of spiral duct for industrial applications. Recently, US Duct has received a number of inquiries from contractors and reps looking for something to substitute for traditional spiral duct ...
Is spiral ducting longer than long?
Spiral duct typically comes in lengths that are not conducive to handling, especially in larger sizes. While the long length may appear to provide faster installation, the truth is that the difficulty of maneuvering it into place increases exponentially with length. The difficulty of loading and unloading spiral duct from trucks increases ...
Do you need a collar for spiral duct?
Spiral fittings (elbows, branches, etc.) can be made with big end/small end connections and eliminate using collars when joining fittings to the straight duct but collars are still necessary for joining straight duct. Both fittings and straight duct also require tape or screws to secure the connections.
Why are ducts high velocity?
Increased velocities produce higher duct friction losses. In order to maintain flow against the higher duct friction, it is necessary to have greater pressures at the air source. Therefore, the terms “high pressure” and “high velocity” generally go hand in hand. Conversely, this is true of “low pressure” and “low velocity”.
What is class A seal?
2 Seal Class A: All seams, joints, fastener penetrations and connections sealed.
How to attach spiral duct to a duct?
Collars create branches from a rectangular duct. Cut a hole in the duct and use a collar to attach spiral duct.
Why is closed duct stronger than open duct?
Closed duct is stronger than open duct because it has a seam that is already locked in place.
What type of connector is needed to connect two pieces of duct?
Male straight connectors are required to connect two pieces of duct.
Do you need a clamp for duct and fittings?
Standard Duct and Fittings. No need for clamps or connectors— duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly. 304 stainless steel is more corrosion resistant than steel and aluminum.
What is round spiral duct made of?
All round spiral duct and fittings shall be manufactured from G-90 galvanized steel, conforming to ASTM and SMACNA standards.
What degree is a conical branch?
Branch connections in medium pressure systems shall be conical for 90 degree taps, and straight for 45 degrees. Seams and tap connections shall be tack welded and sealed with mastic for use up to 4” w.g., or solid welded for use to 10” w.g.
