298 / 416
J-8
J
ANCILLARY EQUIPMENT
© FANTECH
2016
ANCILLARY EQUIPMENT
DESCRIPTION
Maglok
®
is a patented device which eliminates the annoying
banging of butterfly shutters on ‘HC’, ‘SS’ and some New
Generation* style vertical discharge axial roof ventilators.
It also helps protect against rain ingress due to stack effect
or wind action that may cause the shutters to lift open when the
fan is not running.
Features
O
Provides positive closure on various butterfly shutters.
O
Compact size and has no moving parts.
O
Is unaffected by heat and moisture.
Typical Applications
Ideal for installations in high wind areas or on buildings where
the internal pressure, or stack effect causes the shutters to open
when the fan is not running.
Construction
Maglok-2 and Maglok-5 utilise a specially selected rare earth
magnet that is three and half times more powerful than ferrite.
The housings are constructed from corrosion resistant
aluminium, incorporate stainless steel adjustment screws and
have long life corrosion protected striker plates.
Range
There are 2 models in the range: -
* Maglok-2
1-2 kg range
* Maglok-5
3-5 kg range
The holding force of both Magloks is fully adjustable within their
load range.
Design
Depending on what holding force is selected, protection can be
provided to the same integrity as the roof structure according to
the requirements of AS1170.2 Wind Load Code.
How to Select
Generally speaking the maximum holding force available should
govern selection.
The appropriate Maglok
®
can be selected from the graphs
which show the minimum stall pressure which must be
generated by the fan to open the butterfly shutters and the
approximate wind speed a fan would be protected against.
The wind speed can be determined from a detailed study of the
individual installation in accordance with AS1170.2.
Check the selected fan curve to ensure its pressure capacity
is in excess of the stall pressure required. Between them, the
Maglok-2 and -5 can be adjusted infinitely to provide any force
from 1 to 5 kg providing a wide range of choice of stall
pressures and wind loadings.
For fans of 800mm diameter either the Maglok-2 or -5 can be
selected.
If the fan selected is less than 1000mm diameter and does not
have sufficient stall pressure to overcome the 1kg loading, a
Maglok
®
may not be a possible solution.
How to Order
Simply nominate the Maglok
®
model determined from the
selection process and order accordingly.
* Please call our sales representative to confirm suitability for
use on the New Generation Axial roof units.
MAGLOK
®
SELECTION GRAPHS
Fan Diameter, m
Fan Diameter, m
Min. Stall Press., Pa
Min. Stall Press., Pa
Wind Speed
Protection, km/h
Wind Speed
Protection, km/h
0.5
0.8
1.4
1.25
1.0
0.8
0.71
0.63
0.56
100
100
500
500
70
70
125
125
150
150
100
100
80
80
400
400
300
300
200
200
Maglok - 2
Maglok - 5
2 kg
2 kg
1 kg
1 kg
5 kg
5 kg
4 kg
4 kg
3 kg
3 kg
1.6