Specifications
Ducting
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The most common question asked is what size extractor do I need?
Many manufacturers will state the volume of air required for each
machine in their manual. If not, note the size of the extraction port
and use the chart below
outlet size volume of air reqd
50 200 m³/hr
100 700 m³/hr
125 1100 m³/hr
150 1600 m³/hr
200 2800 m³/hr
Example:
for a single machine with a 100mm port an extractor of
a minimum of 700m³/hr will be sufficient. For multiple machines
count the number of extraction ports per size, multiply the number
of each size by the volume of air required. Then add the results
per outlet size to give you a total volume of air required. This total
is for all the machines operating at the same time. You then must
decide which and how many machines will be used at the same
time. Divide the total volume of air required by this number and
add 500m³/hr. Choose an extractor that gives the airflow required
by your calculations. Look at the main inlet size of the extractor, this
is the size of the main duct to be used. In larger systems the ducting
should get larger towards the extraction unit as more machines
that are in use are added to maintain the correct air speed in the
duct. This is very important; if the airflow is too low a build up of
dust and debris will occur and is a fire and explosion risk. If the air
speed is high then the system will be noisy but there will be no
deposits in the ducting. Always use blastgates to close off airflow to
machines that are not in use.
Basic design
•
Keep it simple, don’t over complicate the system
• Keep it straight, ducting runs should all be straight with as few
bends as possible
• Keep transfer duct as big as required by the extractor, this should
get larger towards the extractor
• Keep exible duct to a minimum. If the machine cannot be
connected to the system by solid ducting only then should flexible
ducting be used for the final connection.
• Keep branches joining the duct to a maximum of 45° When
branches join the main duct ideally they must enter at the side
or the top at an angle of a maximum of 45° towards the direction
of flow.
• Fit Blastgates to maximise efciency and balance the system
The negative pressure inside the ducting draws air into the system.
Incorrect sizing of the duct, too many bends coupled to lots of
flexible hose induces losses into the system and in badly designed
systems this is akin to leaving the handbrake on in a vehicle.
*SAVE with a bulk discount – see online axminster.co.uk or call 03332 406406
Simple clips to hold the ducting either
suspended from a ceiling or standing
out from a wall. A variety of diameters
available. The clips have an M8 threaded
hole. Use M8 threaded plated studding, available in 1m or 3m
lengths. Each clip requires a M8/10 back plate (210502) and
M8 studding (410113). By using studding the ducting can be
suspended from the ceiling at the height required. By using short
lengths of studding, ducting can be mounted directly onto a wall.
Blastgate for 100mm Hose £9.46 £7.88 340920
Blastgate for 125mm Hose £11.46 £9.55 200071
Blastgate for 150mm Hose £12.96 £10.80 200070
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Available in a variety of diameters to suit all applications.
Sections of duct can be joined together with short joining
lengths, which fit on the inside of the duct. The perfect solution
for extraction systems.
Ducting
100mm X 1m Ducting £9.96 £8.30 410229
125mm X 1m Ducting £11.95 £9.96 951611
150mm X 1m Ducting £14.95 £12.46 951612
200mm x 1m Ducting £20.95 £17.46 951613
100mm X 2m Ducting £17.95 £14.96 410230
125mm x 2m Ducting £21.96 £18.30 951614
150mm x 2m Ducting £27.96 £23.30 951615
200mm x 2m Ducting £41.95 £34.96 951616
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A short length tube used to join two
fixtures together. It fits over the outside of
the fixtures (bends , T or Y junctions etc.) and can
be secured either with duct tape, self-tapping screws or pop rivets.
The 100mm comes in a pack of 5, the other sizes are in packs of 1
.
Fixture Joiners
Fixture Joiner 100mm (Pkt 5) £14.46 £12.05 410232
Fixture Joiner 125mm (ea) £3.25 £2.71 211461
Fixture Joiner 150mm (ea) £3.25 £2.71 211462
Fixture Joiner 200mm (ea) £3.46 £2.88 211463
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To provide a smooth bend within
a duct system. Fits inside the duct
tubing. Use Fixture Joiners to
connect elbows together.
Steel Elbows
90° Elbow 100mm £9.96 £8.30 410013
90° Elbow 125mm £12.46 £10.38 951601
90° Elbow 150mm £18.46 £15.38 951602
90° Elbow 200mm £24.96 £20.80 951603
45° Elbow 100mm £7.96 £6.63 400499
45° Elbow 125mm £9.46 £7.88 951604
45° Elbow 150mm £13.45 £11.21 951605
45° Elbow 200mm £17.95 £14.96 951606
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Branch Tees are the best way to lead off to
a machine from a duct system. Having a
smooth inner surface and a 45° angle there
is no obstruction to the airflow. Also, these
are available in a range of sizes to suit the
duct and machine extraction outlet.
Branch Tee
100mm off 100mm at 45° £35.95 £29.96 951618
100mm off 125mm at 45° £36.96 £30.80 951619
100mm off 150mm at 45° £37.96 £31.63 951620
100mm off 200mm at 45° £43.96 £36.63 951621
125mm off 125mm at 45° £37.96 £31.63 951622
125mm off 150mm at 45° £39.96 £33.30 951623
125mm off 200mm at 45° £45.96 £38.30 951624
150mm off 150mm at 45° £47.95 £39.96 951625
150mm off 200mm at 45° £51.96 £43.30 951626
200mm off 200mm at 45° £57.96 £48.30 951627
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A short length of tube used to join
two lengths of ducting together. It fits
inside the duct and can be secured either
with duct tape or short self tapping screws. Pack of 5.
Ducting Joiners
Duct Joiners 100mm (Pkt 5) £14.95 £12.46 410228
Duct Joiner 125mm (ea) £3.25 £2.71 951607
Duct Joiner 150mm (ea) £3.46 £2.88 951608
Duct Joiner 200mm (ea) £3.76 £3.13 951609
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Aluminium blastgates, stronger than
plastic and with a locking screw.
Aluminium Blastgates
90° and 45° twin bends are used
when splitting the system off, i.e.
to lead into another room or to the
other side of a workshop. Offering a
smooth air ow with many advantages over the more usual 90°
Tee junction. A selection of 4 sizes and 2 angles available.
Twin Bends
100mm 90° Twin Bend £66.96 £55.80 951630
150mm 90° Twin Bend £84.96 £70.80 951632
100mm 45° Twin Bend £48.96 £40.80 951634
150mm 45° Twin Bend £54.96 £45.80 951636
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End caps are used to seal the end of ducting. Useful
to allow an extension at a later date, or to provide a
permanent seal.
End Cap
100mm £4.26 £3.55 211476
125mm £5.26 £4.38 211477
150mm £5.76 £4.80 211478
200mm £7.45 £6.21 951610
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Reducing adaptors are for stepping down in ducting size, i.e.
from 150mm to 125mm. Available in a variety of sizes. These fit
inside the ducting for a smooth air flow.
Steel
Reducers
100-80mm £12.46 £10.38 410083
125-100mm £12.46 £10.38 410084
150-100mm £14.95 £12.46 410085
150-125mm £13.96 £11.63 510074
180-150mm £21.96 £18.30 951628
200-150mm £18.96 £15.80 951629
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With so many saw tables now with
extraction both under the saw and over the
top on the saw guard, it is often the case
that the top guard extraction point is never
used because there is no easy means of
joining in the smaller hose. Here is a simple answer: two galvanised
adaptors which go in line with the 100mm hose and provide a
handy connection for the top guard hose, either 50mm or 38mm.
Steel Saw Table
Adaptors
Y Junction 100-50mm £40.96 £34.13 810353
Y Junction 100-38mm £40.96 £34.13 810352
Black GP Hose 38mm x 2.5m £22.96 £19.13 200783
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Suspension Rings
100mm £5.26 £4.38 211466
125mm £5.26 £4.38 211467
150mm £5.46 £4.55 211468
200mm £6.46 £5.38 211469
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Used for mounting suspension rings to ceilings or walls.
Threaded Plated Studding
8mm x 1m £2.76 £2.30 410113
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Plated back plates for use with all suspension rings. Threaded
M8 and with 2 mounting holes. Use M8 studding to mount the
ducting the appropriate distance from the ceiling or wall.
M8 Threaded
Back Plate
Back Plate £3.46 £2.88 210502
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A simple 0-5kPa manometer, used to
monitor the air flow within ducting used as
part of a dust/chip extractor system (LEV).
The fitting of a manometer on each “hood”,
e.g. extraction point, is recommended
as a method of daily monitoring of the
system’s performance by the HSE in their
LEV checklist for employers. This unit provides an “at a glance”
monitoring of the system at each extraction point each time it is
used, thus satisfying the requirements under the HSE’s guidance.
These are used by our own Extraction Installation team when
fitting new systems.
Manometer 0-5 kPa
Manometer, 0-5kPa £94.96 £79.13 210675
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Dust Extraction.indd 124 27/11/2014 16:05