These products can be custom built for your project or can be purchased through a stocking distributor in your area for common diameters and lengths.
Oval spiral ductwork.
The design of a duct system utilising flat oval duct follows the same procedures used with rectangular duct.
Flat oval spiral pipe is fabricated in spiral lock seam or longitudinal welded construction.
The spiral pipe is more energy efficient as it has lower airflow resistance.
Round spiral duct is the best choice for duct construction but if you don t have the room flat oval is still a better choice than rectangular duct.
This means 18 x 34 flat oval spiral duct will have the same friction loss as 25 7 round spiral duct.
Because of this spiral ducts can be manufactured with less heavy gauges than would be used in longitudinal rectangular ducts.
Semco spiral round and flat oval duct systems provide you with the advantages of automation and mass production without the expense of investing in the required equipment.
Where space limitations require the use of oval duct the circular duct is converted to its equivalent roladuct spiral flat oval duct by using the selection chart.
So if you still look at spiral flat oval duct as an expensive rectangular duct with the corners rounded off you need to move out of the 1980 s and see the changes that have taken place in the last 25 years.
Another great advantage of flat oval spiral duct work is that the cost of operating them is relatively low.
Applied end treatments can be e z flange with barrel clamp standard slip connection or angle iron rings.
The spiral lock seams used by round and oval ducts increase the ducts stringency.
Round oval single wall double wall galvanized galvaneal aluminum or stainless steel for a list of spiral pipe accessories please go to our products page other products available include fire dampers louvers control backdraft dampers registers grilles diffusers roof curbs equipment supports fans.
Next find 25 7 for a flat oval with a smaller minor axis.
Nominal size mm base tube dia.
H x w h x w h x w.
Backed by sate of the art manufacturing unit we have been able to develop a quality range of pre insulated double walled flat oval spiral duct this double walled insulated flat oval spiral duct includes an external pressure tight metal shell and a 12 5 25 50mm thick of fiberglass mineral wool puf insulation.
Flat oval duct has been designed for restricted space conditions that cannot accept round spiral duct.
To change the size first note the equivalent round size listed for 18 x 34 it is 25 7.
Unlike other types of ductwork spiral and oval offers optimal performance when lined or fabricated using a double wall system.
Change 18 x 34 flat oval to a smaller size.
For pricing mm equivalent round mm due to friction loss.
Maximum length 3 5m double corrugated.
Sizes of flat oval spiral duct.
