Flat-Oval Spiral Duct

Flat-oval spiral duct is machine formed round spiral duct. The straight sections of the long sides are stretched taut and perfectly flat. The flat oval shape is specifically plain duct designed for low head room and restricted space locations which can't accept round duct.

Spiral Duct work systems in both round and flat-oval shape have many advantages. Some of the major advantages include

  bgbot.gif (46 bytes)  Light weight spiral reinforced walls.

  bgbot.gif (46 bytes)  Smooth streamline internal sufaces giving low
      frictionloss and no turbulence.

  bgbot.gif (46 bytes)  Long runs in continuous lengths.

  bgbot.gif (46 bytes)  Simple joining technique

  bgbot.gif (46 bytes)  Matted fittings of consistent size.

  bgbot.gif (46 bytes)  Reduced space requirement in height or depth.

Specifications
Thickness
0.63 (24G) to 1.0mm(20G)
Thickness of flat-oval spiral ducts are as per SMACNA "HVAC Duct Construction Standards" - 1985.

Major axis
Duct width
"B"

Spiral Duct
Thickness
Gauge(mm)

Duct Fittings
Thickness
Gauge(mm)

to24"

24 (0.63)

20(1.00)

25" to 36"

22 (0.80)

20(1.00)

37" to 48"

22 (0.80)

18 (1.25)

49" to 60"

20 (1.00)

18 (1.25)

61" to 70"

20 (1.00)

16 (1.60)

Length   : 4,8,10 and 12 ft. length


Material :
Galvanised steel, mild steel (CRCA), Aluminum,
Stainless Steel etc.,

Surface Constructions :
Plain or Corrugated (to increase the radial rigidity of the duct by 300%

Standard Sizes

Basic
Circular
diameter

Nominal Duct Height (A)

6"

8"

10"

12"

14"

16"

18"

20"

16"

22"
ø 12"

21"
ø 13 1/2"



18"

25"
ø 12 1/2"

24"
ø 14 1/2"

23"
ø 15 1/2"

20"

28"
ø 13"

27"
ø 15"

26"
ø 17"

25"
ø 18"

22"

31 1/2'
ø 13 1/2"

301/2"
ø 16"

29"
ø 17 1/2"

28"
ø 19"

27"
ø 2ø"

25 1/2"
ø 21"

 

  

24"

33"
ø 16 1/2"

32 1/2"
ø 18 1/2"

31"
ø 20"

3ø"
ø 21 1/2"

29"
ø 22 1/2"

28"
ø 23"

   

26"

36 1/2"
ø 17 1/2"

35 1/2"
ø 19 1/2"

34 1/2"
ø 21"

33"
ø 22 1/2"

32"
ø 23 1/2"

31"
ø 24 1/2"

29 1/2"
ø 25"

28"

39 1/2"
ø 18"

38 1/2"
ø 20"

37 1/2"
ø 22"

36 1/2"
ø 23 1/2"

35"
ø 24 1/2"

34"
ø 26"

33"
ø 26 1/2"

30"

42"
ø 21"

40 1/2"
ø 22 1/2"

39 1/2"
ø 24 1/2"

38 1/2"
ø 26"

37"
ø 27"

36"
ø 28"

32"

45"
ø 21 1/2"

44"
ø 23 1/2"

42 1/2"
ø 25 1/2"

41 1/2"
ø 27"

40 1/2"
ø 28"

391/2"
ø 29"

34"

48"
ø 22 1/2"

47"
ø 24 1/2"

46"
ø 26"

45"
ø 28"

44"
ø 29"

42"
ø 30 1/2"

36"

51 1/2"
ø 22 1/2"

5ø"
ø 25"

49"
ø 27"

48"
ø 28 1/2"

461/2"
ø 30"

451/2"
ø 311/2"

38"

53"
ø 25 1/2"

52"
ø 25 1/2"

51"
ø 29 1/2"

50"
ø31"

49"
ø 32 1/2"

40"

56 1/2"
ø 26 1/2"

55 1/2"
ø 28 1/2"

54"
ø 30 1/2"

53"
ø 32"

52"
ø 33 1/2"

42"

60"
ø 27 1/2"

58"
ø 29"

57"
ø 31"

56"
ø 33"

55"
ø 34 1/2"

44"

63"
ø 27 1/2"

61 1/2"
ø 30"

60"
ø 32"

59 1/2"
ø 33 1/2"

58
ø 35 1/2"

46"

65"
ø 30 1/2"

64"
ø 32 1/2"

62"
ø 34 1/2"

61"
ø 36 1/2"

48"

68"
ø 31"

67"
ø 33 1/2"

65 1/2"
ø 35 1/2"

64 1/2"
ø 37"

Pre-insulated Double-walled Flat-oval Spiral Duct Systems
Thermal / Acoustic Insulation:

A double-walled insulated Flat-oval Spiral Duct consists of an external pressure tight metal shell, a 12.5 / 25 / 50mm thick of fiberglass / mineral wool / puf insulation and internal plan protective metal liner for thermal insulation or perforated metal inner liner for acoustic insulation.

             

Duct Fittings

A complete line of duct fittings designed for low leakage and efficient performance is available for use with single-wall and double-wall Flat-Oval Ducts.

Joining System
Flat-Oval Spiral Ducts and duct fittings joined together by slip joint coupling.

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