CHEMICAL
RESISTANT FUME EXTRACTION FANS
A full range of heavy duty chemical resistant exhaust
fans for handling air and corrosive fumes from laboratory fume
cupboards, fume hoods and acid tanks
Available in all arrangements direct or belt driven.
 Design
Johndec SafetyfIow Series fans are designed to ensure
smooth flow characteristics from fully open to fully closed conditions.
Special attention has been given during design and development
to ensure low noise level characteristics. Johndec Safetyflow
Series fans are renowned for their strong and solid construction,
practically any mixture of aggressive gases and vapours can be
transported with suitably designed Johndec Safetyflow fans without
corrosion problems. Materials of construction, depending on what
hazardous acids are being used within the fume system will be
specially determined. Johndec Safetyflow Series fans can be manufactured
in:
1. Polyvinyl chloride sheet (PVC)
2. Polypropylene sheet.
3. Polyvinyldene fluoride sheet (PVDF).
4. Fibre Reinforced plastic (FRP).
Additional features are available through corresponding material
modifications of design measures:
1. Anti Static Design
2. Low Flammability
3. Heat Resistance
4. Mechanical Reinforcement
5. Explosion Protection
 Fan
Casing
Are of sturdy construction fully hand welded using a
triple seam weld rod. The fan casings are reinforced with welded
angles and stiffeners, the result is a truly robust and high quality
product capable of withstanding all normal forces of operation
for many years. The inlet is flanged with a bell mouth inlet cone.
Standard rectangular outlet is flanged and a separate rectangular
to round transition is available. Fan casings can be fabricated
in all the above materials.
Impeller
The impeller is of all polypropylene or PVC welded construction
and is designed and finished for efficient and quiet operation.
Drive from shaft to impeller is through a mild steel boss, this
boss is bolted to the impeller back plate. All metal (including
shaft) which may be exposed to corrosive fumes are completely
covered with polypropylene or PVC. All impellers are statically
and dynamically balanced.
Shafts
Are accurately machined mild steel, liberal in size to afford
rigid support-for-the-overhung fan impeller.
Shaft Seal
The polypropylene or PVC covered impeller centre is extended and
projects outside the fan casing and is fitted with an efficient
high quality plastic seal which is resistant to chemical corrosion,
wear and tear.
 Direct
Drive
Alternative arrangements are available, direct drive by electric
motor with impeller mounted on motor shaft. This arrangement is
most economical where motor speeds can be matched to fan duty
and any type of foot mounted can be utilised.
Belt Drive
In this case the fan shaft is carried in high quality ball-bearings
mounted in a duplex housing providing certainty of bearings alignment
a full protection for the fan bearings. The belt drive can then
be from a motor mounted either on the frame or separately mounted.
Motor or Bearing Base
Is constructed from mild steel and treated with high quality anti-corrosive
paint. Cadmium plated nuts and bolts are used externally. The
base frame is then mounted on four anti-vibration springs
Motors
Fans may be fitted with almost any type of foot mounted motor,
but unless otherwise specified Totally Enclosed and Totally Enclosed
Fan Cooled motors of recognised Australian or overseas manufacture
would be used.
 JFC
Series Fans
Designed principally to handle extraction of chemical fumes from
fume cupboards, fume hoods, atomic absorption unit and tanks.
They are a direct driven type fan fitted with a backward curved
or forward curved type impeller.
Capability: Volume (Litres per second) 50L/S to 1200L/S
JBC Series Fans
Designed principally to handle extraction of chemical fume from
fume cupboards, fume hoods, acid tanks and installations employing
fume scrubbers. They are indirectly driven via shaft belts, pulley
and bearings: Fitted with a backward curved type impeller
Capability: Volume (Litres per second) 300L/S to 10,000L/S
Specific performance and detailed dimension data for all models
available on request. Our sales staff would be happy to provide
advice on the best fan to suit our own particular needs.
[back to products] |