Ducting

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DUCTING

DUSTECH fabricated accordance with 2005 ‘SMACNA’ standards, ASHRAE standards o as per consultants specifications.

 

Rectangular duct work has been the main type of duct work in history of HVAC. It is still used today on a greater percentage of commercial projects over any other type. Commercial construction jobs. Every piece we manufacture meets or exceeds standards and project requirements, including Leeds and GREEN CONSTRUCTION STANDARDS.

 

Dustech is in fabrication of SPIRAL, OVAL & RECTANGULAR DUCTS & ducts products in galvanized iron steel, aluminum, stainless steel, fire rated ducting, linear acoustic insulation and aluminum cladding with an option of painting & powder coating.

RECTANGULAR DUCT

DUSTECH’ Rectangular duct and fitting are factory fabricated to furnish with a high quality line of products in a board range of standard size. To minimize field- ssembly/fabrication cost. Rectangular duct is supplied in lengths upto 4 feet.

 

Longitudinal seams are typically made with Pittsburgh lock in transverse joint S&C cleat joint, four-bolt connectors are available.

 

DUSTECH-Rectangular duct work can be shipped completely assembled or knock down in ‘L’ shape. ‘DUSTECH’ standard rectangular products are fabricated to meet SMACNA, ASHREA duct connection/fabrication standards. We can also custom fabricate rectangular duct work for commercial and industrial application according to consultant specification.

 

This table gives minimum duct wall thickness (gage) for use of flat type joint system. Plan S and hemmed as connectors are limited to 2 in. wg maximum. Slip and drives must not be less than two gages lighter than the duct wall nor below 24 gage. Double S slips must be 24 gage for duct 30in. (762mm) wide or less and 22 gage for greater width.

DUCT DIMENSION (mm) PRESSURE CLASS (in. wg)
Positive or Negative
⅟2 1 2 3 4 6 10
200 26 26 26 24 24 24 22
201-250 26 26 26 24 22 20 18
251-300 26 26 24 22 20 18 16
301-350 26 24 22 20 18 18
351-400 26 22 20 18 18 16
401-450 26 22 20 18 16
451-500 24 20 18 16
501-550 22 18 16 16
551-600 22 18 16 16
601-650 20 18
651-700 18 16
701-750 18 16
751-900 16

REINFORCEMENT IS REQUIRED

Duct gage 26 to 22 20 18 16
Minimum flat slip and drive gage 24 22 20 18

DUCT ASSEMBLY ARRANGEMENT

To install the TDF corner, hook first leg of corner under flange. Snap the second leg of TDF corner into place on the duct flange using hammer.

 

The corner may also be installed by setting the duct upon its end so the flanges are flat against a floor, and then tapping the corner into place with a hammer. The floor supports the flange prevent damage by the procedure.

 

The preparation is required on only one end of each duct to be joined. Fix the continuous length of gasket on the center of the TDF flange on all four side.

Apply sealent over the corner if small gap occure at the center of the Duct and TDF flange. Place on prepared flange together and insure the alignment by inserting the carrage bolt and then Duct need to be clamped by the standard Dustech cleats at every interval of 6” as shown in the figure with the help of Dustech brouch tool.

 

Ensure not to use hammer for installation of cleat which may caused damage to the Duct.

SPIRAL DUCT

“DUSTECH” has been established to supply spiral duct and associated fittings our commitment to excellence also extended our leading after sales services and supply program’s “FOR ORDERING TO ON GOING SUPPORT.” Dustech specializes in HVAC & Dust extraction systems. We at Dustech (Roll-o-fab) master the science of air management with the experience of derstanding of practical applications, ensure the project is error free, on time and on budget. We look forward to work with your organization. Thanks for considering “DUSTECH DUCT” For your next project.

“DUSTECH” CAN BE USED IN VAROIUS FIELD SUCH

  • As high and low velocity air handling
  • General ventilation
  • Warm air heating
  • Sound absorbers
  • Weather proof jacketing of pipeline
  • Column formers
  • Pier liners
  • Dust extraction
  • Fume extraction
  • Air conditioning
  • Tunnel/Mine Ventilation
  • Void/Spon Tubling
  • Daring/Irrigation
  • Pool Fundamation
  • Display Props
  • Conveyor
  • Culvet
  • Well Casing

ADVANTAGES OF DUSTECH DUCT

  • Energy efficient
  • Easy & fast installation
  • More straightly per square meter
  • Low noise level
  • Maintenance friendly
  • Modification & extraction is easy
  • Low friction losses
  • Need less handling arrangement
  • Light in weight
  • Low project cost
  • No accommodation of dust and foreign material in corner being smooth surface
  • Can be exposed for good a static
  • Used less raw material

AVALIBLITY OF SIZE/MARKED(28 SWG-18AWG)

  • Galvano (pb free)
  • Stainless steel
  • Milled steel
  • Galvanized steel
  • Aluminum

DUCT FITTINGS

All accessories bends, elbow, reducer off set, endxaps & Tee pieces etc are manufactured high speed modify with accurate dimension

SPIRAL DUCT

DUSTECH DUCT INSTALLATION INSTRUCTION

  • Spiral pipe must be cut at straight right angle and be burred.
  • Make sure the spiral pipe or large end fitting is ushed all the way in and up to the groove of the small end fitting.
  • Secure the slip connection together by using 1/8 sheet metal screws or rivets.
  • Place the screw or revits 1”-1⅟2 from the edge of the duct or the large end fitting to avoid cutting the gasket.

SELF SEALING COUPLING

  • Between 15% to 25% off you field installation cost lower down.
  • Ensure tight seats, assuring clean air quality and energy saving.
  • Fitting can be used with most spiral pipe, without calibration.
  • Ideal for exposed spiral projects finished duct work is clean with no silver tape
  • Fitting is available in a vasity of metal and gauge.
  • Fitting can be taken support easily after connection have been made.
  • Fitting can be reased,new screw hold can be added without destroying the integrity of self sealing system.
  • If at the same point the gasket is damaged the fitting can be used as a part of the self system by shipping on a new o ring.

SELF SEALING COUPLING

SIZE AND WALL THICKNESS CHART

NomMm          Inches NomMm          Inches NomMm          Inches
102                    4 432                  17 914                   36
127                    5 457                  18 965                   38
152                    6 483                  19 1018                 40
178                    7 508                  20 1057                 42
203                    8 533                  21 1118                 44
229                    9 559                  22 1168                 46
254                  10 584                  23 1219                 48
279                  11 610                  24 1270                 50
305                  12 660                  26 1321                 52
330                  13 711                  28 1372                 54
356                  14 762                  30 1400                 55
381                  15 813                  32 1500                 59
406                  16 864                  34 1600                 63

WALL THICKNESS FOR DIAMETERS (OTHER DIAMETERS AND THICKNESS UPON REQUEST)

0.6mm 0.8mm 1.0mm 1.2mm

OVAL DUCTING AND PIPING

Dustech spiral flat-oval duct is machine formed from Dustech round spiral duct. The flat shape is specifically designed for low head room and restricted space locations which cannot accept round duct.

FLAT-OVAL DUCT DESIGN:
The design of a duct system utilizing flat-oval duct follows the same procedures used with rectangular duct.

  • The system is first designed on the basis of circular duct.
  • Where space limitations require the use of oval duct, the table has been arranged in a maner that makes its uses similar to tables for rectangular duct and should be used in exactly the same way.
  • Spiral flat-oval duct is made only in the sizes listed in tables 1. For maximum economy, select your flat-oval duct size from table 1.
Height(A) = 152mm

Width # (B) = 483mm

Equialent round DIA for EQUAL Capacity & Friction Loss = 279

Oval
Made
From
Dia (mm) 356 381 406 457 508 559 610 660 711 762 813 864 914 965 1016 1047 1118 1168 1219 1270 1321 1372
Nominal Duct Height (A) 152 #483 ~279 #521 ~292 #560 ~305 #635 ~318 #711 ~330 #800 ~343 #876 ~368 #952 ~381 #1041 ~394 #1176 ~406
203 #533 ~343 #610 ~368 #686 ~381 #755 ~406 #838 ~419 #927 ~445 #1003 ~457 #1092 ~470 #1168 ~483
254 #584 ~394 #660 ~432 #737 ~445 #826 ~470 #902 ~495 #978 ~508 #1067 ~533 #1143 ~546 #1218 ~559 #1308 ~572 #1379 ~604 #1461 ~610 #1531 ~621 #1626 ~635
305 #635 ~457 #711 ~483 #787 ~508 #876 ~533 #953 ~559 #1029 ~572 #1118 ~597 #1189 ~625 #1270 ~635 #1349 ~662 #1435 ~673 #1511 ~696 #1600 ~699 #1660 ~716 #1753 ~724 #1820 ~742 #1918 ~762 #1981 ~784
356 #686 ~508 #762 ~546 #838 ~572 #927 ~597 #1003 ~622 #1080 ~648 #1165 ~671 #1245 ~680 #1320 ~713 #1410 ~724 #1481 ~752 #1562 ~762 #1646 ~787 #1727 ~787 #1802 ~821 #1892 ~846 #1952 ~850
406 #648 ~533 #737 ~572 #813 ~597 #889 ~622 #978 ~660 #1054 ~686 #1131 ~710 #1219 ~724 #1291 ~757 #1375 ~775 #1452 ~800 #1537 ~813 #1612 ~840 #1702 ~851 #1773 ~877 #1854 ~921 #1923 ~943
457 #711 ~584 #787 ~622 #864 ~660 #940 ~686 #1029 ~711 #1102 ~745 #1181 ~762 #1267 ~797 #1346 ~813 #1423 ~844 #1511 ~851 #1583 ~887 #1664 ~902 #1750 ~928 #1829 ~947 #1894 ~970
508 #749 ~635 #838 ~673 #914 ~711 #1003 ~737 #1073 ~775 #1156 ~800 #1241 ~830 #1321 ~851 #1394 ~882 #1473 ~902 #1554 ~934 #1638 ~940 #1724 ~974 #1803 ~978 #1865 ~1003
610 #1087 ~876 #1168 ~900 #1248 ~910 #1327 ~940 #1708 ~965 #1486 ~995 #1567 ~1006 #1646 ~1032 #1726 ~1040 #1807 ~1062

OVAL DUCT – SPECIFICATIONS

FLAT OVAL DUCT CONSTRUCTION FOR POSITIVE-PRESSURE DUCT SYSTEM

MINIMUM GALVANIZED STEEL THICKNESS

Thickness: 0.50(26G) to 1.2 mm (18G). Thickness of flat-oval spiral ducts as per SMACNA “HVAC DUCT CONSTRUCTION STANDARDS” -2005

Standard Length : 4,8,10 and 12ft. length

Material : Galvanized steel, mild steel (CR), Aluminium, stainless steel etc.

Surface constructions : Plain or corrugated (to increase the radial rigidity of the duct by 300%.

Surface finish : Powder Coated, Painted.

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Major Axis (mm) Spiral Seam Duct Longitudinal Scam Duct Fitting Suggested type of joint
610 24 SWG 22 SWG 20 SWG Groove Slip Connector
915 22 SWG 22 SWG 20 SWG Groove Slip Connector
1220 22 SWG 20 SWG 20 SWG Flange
1525 20 SWG 20 SWG 20 SWG Flange
1780 20 SWG 18 SWG 18 SWG Flange
1780 Over 18 SWG 16 SWG 18 SWG Flange