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What is Radon?
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Radon is the common term for Radon 222 which is produced from the radioactive decay of Radium 226 which in turn is produced from the decay of Uranium, widely present in trace quantities in most soils and rocks. It escapes from the ground in a form of gas and is present in many areas throughout the world. In the open air it does not normally pose a problem as the minute quantities are quickly dispersed.
However, for many years now, radon has been recognised as a cause of lung cancer in mines where concentrations can build up.
It was only as recently as 1984 that anyone realised that high radon concentrations also occurred in buildings often to levels many times greater than those legally allowed in mines.
Prolonged exposure to high concentrations of radon increases the risk of lung cancer, the risks being greater when combined with smoking.
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The Radon Sump
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One of the most successful means of reducing Radon concentrations is the radon sump. When used in conjunction with a radon barrier and a RMF Centrifugal In-Line fan the system can reduce radon levels to well below the recommended maximum level of 200 bacquerels/m³ (measured in the the USA as 4 picocuries/l).
The sump is buried in hardcore below the floor level of the building. When the fan is activated, negative pressure is created in the sump and its surroundings.
As the radon percolates up through the ground, it is attracted towards the negative pressure of the sump, where first it is collected then extracted, via a vent pipe through the fan, and finally discharged above roof level to be dispersed harmlessly into the surrounding atmosphere.
The system shown can be installed in a new build or refurbished properties.
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The Only Fan To Use
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 Vent-Axia's tried and tested RMF fan has proved itself to be the ideal fan for use when extracting from radon sumps, The specially adapted RMF has all the original features of the highly successful Vent-Axia Turbo range, including the non-stalling characteristics, multi-speed motor and the robust and efficient design. In addition to all the standard features the RMF has extra seals to prevent radon leakage. In all cases the RMF is ideally suited, with its tough, weatherproof, corrosion resistant casing it can be used in almost any application.
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Casing
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The tough, dense, dough molded glass fibre housing ensures minimum noise breakout, is aesthetically pleasing and yet will survive the most demanding of environments. It is corrosion resistant and weatherproof as standard and is double sealed to guard against leakage, including the cable entries which are sealed with silicon rubber. The housing is UV stabilised to retain its original colouring.
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Mounting
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Mounting the fan could not be more simple with the specially designed 'chunky' foot supplied as standard. The foot can be screwed to the wall, rafters, joists or ceiling beforehand and the fan unit simply clicks into position. The unit connects easily to standard soil pipe connections. Simple, sturdy and practical the elegant RMF is an admirable work unit which can perform effortlessly and yet is so easy and economical to install.
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Motor & Impeller
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The external rotor motor is directly coupled to a factory matched, high efficiency, backward curved impeller and balanced to quality class reference G63 - VD1 2060 to give quiet virtually vibration free running. The motor is fitted with sealed for life bearings packed with a specially developed lubricant. The units are suitable for domestic single phase supply and for ambient temperature up to 50°C. All motors are fitted with Hot Spot Motor Protection by means of a thermal contact in the motor windings to prevent motor damage from over loading.
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Selection
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With its multi-speed capability the RMF 150 is sufficient for most installations, however, for the larger applications the RMF 200 can be used.
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Performance Graphs
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| Speed
| m³/s at Pa
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| 0
| 25
| 50
| 75
| 100
| 150
| 200
| 250
| 300
| | 100%
| 0.131
| 0.123
| 0.115
| 0.104
| 0.096
| 0.078
| 0.061
| 0.042
| 0.008
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| 75%
| 0.121
| 0.109
| 0.098
| 0.088
| 0.079
| 0.064
| 0.033
| 0.037
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| | 50%
| 0.073
| 0.054
| 0.043
| 0.035
| 0.028
| 0.017
| 0.011
| 0.006
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| 25%
| 0.045
| 0.021
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| Speed
| m³/s at Pa
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| 0
| 25
| 50
| 75
| 100
| 150
| 200
| 250
| 300
| 350
| | 100%
| 0.244
| 0.236
| 0.228
| 0.219
| 0.209
| 0.182
| 0.156
| 0.126
| 0.089
| 0.037
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| 75%
| 0.161
| 0.144
| 0.122
| 0.085
| 0.085
| 0.067
| 0.060
| 0.051
| 0.031
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| | 50%
| 0.117
| 0.086
| 0.069
| 0.055
| 0.050
| 0.042
| 0.037
| 0.021
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| 25%
| 0.068
| 0.032
| 0.022
| 0.014
| 0.008
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Dimensions
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| Model
| A
| B
| C
| D
| E
| F
| Weight (kg)
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| RMF 150
| 91
| 145
| 150
| 307
| 176
| 162
| 3.7
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| RMF 200
| 95
| 148
| 200
| 352
| 201
| 162
| 5.0
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Enquiries
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For enquiries regarding North America, please click here.
For enquiries regarding the rest of the world, please complete this form and click 'Submit':
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