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Ducting Products









Poly Ducting




Ducting Support and Instalation      
L.E.V Testing

Once a ducting dust extraction system has been installed it should be commissioned to ensure it is performing to its design specification. Appropriate details of airflow velocities and pressures should then be recorded to provide standard performance data for future reference.
L.E.V testing
Testing of the system should be carried out at least every 14 months to check for blockages, leaks or other deficiencies within the system. L.E.V. testing is carried out by our consultant engineer and a report is produced with any recommendations or remedial work that may be required to bring the system up to its original specification

All fit together ducting systems allow for some degree of leakage. Quick Assembly clamped ducting is no exception and is not sold as an airtight duct system. In addition to standard PVC foam gasket, ASM Ltd offers special clip gasket material for high heat and enhanced sealing. Further, the applying of sealants to the individual rolled ends can enhance the tightness of the system. However, the Quick Assembly clamped  duct system is sold as a quick way of installing and modifying ductwork, while at the same time retaining the usability of each component. In short, Q.A. is meant to be able to be taken apart, re-assembled, stored or moved. Completely eliminating the possibility for leakage jeopardises the inherent benefits of the duct. Standard Q.A. is designed to provide tight sealing and efficient airflow under negative pressures. To that end we are providing the following information for ducting situations where fan sizing is of extreme importance.

The following data was obtained using standard components and was performed in accordance with the ‘HVAC AIR DUCT LEAKAGE TEST MANUAL’. The information gives the leakage rate per joint of duct at various pressures. To utilise the chart, count the number of clips (this equals the number of pieces) per rise and multiply by the number given beside the corresponding diameter and under the applicable pressure. These numbers assume that the product is properly installed, free of dents in the joining ends and that the gasket is in place. Special gasket material and sealants will increase the sealing capabilities.
Dia (mm) 3”WG 5”WG 7.5”WG 10”WG 15”WG 20”WG 25”WG 30”WG
0.60 0.80
0.30 0.30
0.60 0.80
0.30 0.30
0.60 0.80
0.30 0.30 0.35
0.50 0.60 0.80
0.30 0.30 0.35
0.50 0.60 0.80
0.30 0.30 0.35
0.50 0.60 0.80
0.30 0.30 0.35
0.50 0.60 0.80
0.40 0.40
0.60 0.70 0.90
0.70 0.80
0.80 0.90 1.10
0.60 0.70 1.00
1.10 1.20 1.40
0.70 0.80 1.10
1.30  1.50 1.70
0.90 0.90 1.20
1.50 1.70 2.00
Duct Specifications
  • Components constructed of galvanised steel sheets produced by the continuous galvanising process, which conforms to lock forming quality ASTM A-527, and commercial quality ASTM A-526. Galvanised sheeting is
    produced with the minimum of spangle.
  • Components constructed of stainless steel will be 304 2B mill finish as standard, or 316 2B mill finish if specified.
  • Rolled Edge - Material sheet blanks are 1250mm long and rolled with a fully welded longitudinal seam. The ends of the duct are then formed at each end, thus producing a rolled edge on both ends of the duct, and creating reinforcement every 1250mm.
  • Flanged - Material sheet blanks are 2500mm long and rolled with a fully welded longitudinal seam. A flat bar flange is placed on the end of each duct, and is allowed to spin, thus making it easier to line up holes when installing. All rolled duct joints are secured by using a clip. Locking pins are installed to ensure that clips cannot be accidentally released once installed.

Duct should be supported as follows:

  • 100 Dia - 250 Dia on 7 metre centres.
  • 315 Dia - 900 Dia on 5 metre centres.

Supports should be installed to provide lateral stability to the entire ducting system. Each installation is unique and should be evaluated.

Velocity Requirements for Typical Materials
Conveyed Material Velocity FPM Example
Gases, Smoke, Vapour
1000 - 2000
All Vapours, Gases and Smoke
2000 - 2500
Very Fine Light Dust
2500 - 3000
Cotton Lint, Litho Powder, Wood Flour
Dry Dusts and Powders
3500 - 4000
Light Shavings, Rubber Dust, Soap Dust
Industrial Dust
4000 - 4500
Wet Sawdust, Metal Turnings, Wood Blocks
Heavy or Moist
4500 +
Moist Cement Dusts, Quick Lime Dusts
Rule of Thumb - Labour Guidelines

The following methods should be used for comparison and budgetary purposes only! By no means should they be used to confirm a job installation.
  • A+B = Manhours
  • Rolled edge duct = 10 hours per 50 metres
  • Flanged duct = 15 man hours per 50 metres
  • Straight runs and trunk lines
Machine Connections

  • Machiunes with 3 or more ports = 3 hours per machine
  • Machines with 1-2 ports = 2 hours per machine
Quick Method = (total number of ports) x 3 hours Y, Y x 2 Ducting system total man hours.
Installation Instructions 

The Quick Assembly Clip System is so easy to install that it eliminates time consuming and costly procedures. There is no longer any need to use rivets or screws, just the quick release clip with integral seal.
  • Easy to install
  • No rivets or screws required
  • Quick release clip with integral seal
  • Smooth internal finish
  • Easily adapted to existing systems
  • Available in galvanised and stainless steel
All Quick Assembly Clipped duct systems are equipped with a rolled collar at both ends that serves as a clipping edge for the Q.A. clip. This results in tight joints and, combined with the smooth internal finish producing low transitional resistance, ensures that the Quick Assembly Clipped duct System is ideal for pneumatic transport of material. Ease of assembly and re-assembly makes this the ideal system when re-siteing machinery, thus cutting possible costly down-time.
Step 1

Connect all 30o Branch pieces and 60o elbows to produce a required 90o angle. Lay out branch and elbow assemblies on the floor in line with machine entry points as shown.
Ducting segmented_bend Step 2

Connect the branches to ducting sections of the correct length and diameter. Adjustment to length on
 duct sections is achieved by using ASM Ltd slip joint assembly instructions
Ducting instalation step 2
Step 3

Carefully raise main or sub-main to required centre line height above floor using preferred ASM Ltd hanging material.
Ducting instalation step 3 Step 4

Extend branch arms to machines using correct length and diameter duct. Adjustment to length of duct sections is achieved by using ASM Ltd slip joint assembly instructions. Fit another 90o elbow on end of each horizontal run.
Ducting instalation step 4
Ducting Instaltion step 5 Step 6

Connect main or sub-main to filter, fan or desired machinery with required
standard or custom fitting manufactured by ASM Ltd, or continue with next section of system.
Ducting instalation step 6
Installing a Slip Joint into a Ducting System
Step 1

Requirements for using an adjustable slip are a duct length less than the standard 1250mm section of duct.
Ducting slip joint step 1 Step 2

Cut non-standard length from standard 1250mm section of duct.
Ducting Slip joint step 2
Step 3

Be sure that the cut section of the duct is placed into the line with the direction of air flow.
Ductwork instalation of Sli _joint step 3 Step 4

Adjust the assembly to the proper length required for the space to be filled.
Ducting instalatio slip joint step 4

Step 5

Finish connection using the adjustable slip assembly.
Ducting instalation slip joint step 5 Ducting instalation slip joint step 6
Installing a Branch Plate

Temporarily place the Branch Plate on the main duct in the required position, and while holding in place, mark the interior of the branch on the duct line where it is to be cut.

Take down Branch Plate and drill a starter hole in the main duct along the line traced from the branch. Then using metal snips or a jigsaw, cut out metal piece that has been traced out. File or grind any sharp edges to ensure efficient flow.

Now use an industrial strength silicone sealant to seal between Branch Plate and main duct.

Use small sheet metal screws or pop rivets to secure Branch Plate to main trunk.

Painting Galvanised Components

Wash down all components with an industrial degreaser, ensuring that no oils or residues are left behind. Apply an epoxy primer in a light coating. For final coat, apply an acrylic water base paint.

Sealant Used on Seams of Components

Scotch Seal 2084 metal sealant, 3m ID # 62-2084-2631-2.

 Ingredients: acetone, acrylonitrile, kaolin, phenolic resin, rosin ester Salicylic acid, aluminium pigment zinc oxide, amorphous silica.
                                        Rapid Assembly Superior Strength Ducting

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