6
CHANGING FILTERS
Inlet and outlet pressure should be monitored periodically with a suitable differential pressure meter to
determine percentage filter blockage - manufacturer recommended start and final pressures for each
configuration are shown below.
Note differential pressure monitoring is only suitable for measuring particulate filter blockage and
cannot be used to determine when carbon filters require replacement. For this, suitable gas detection
equipment should be used to compare inlet and outlet concentrations of the gasses being filtered. As
the ratio Concentration Out/Concentration In approaches 1 the carbon filters are becoming less effective
and will require replacing when the outlet concentration is above the predetermined maximum allowable
value.
When changing filters the ventilation system must be offline and disconnected from the mains to avoid
restart without filtration in place.
Open the unit in area sheltered from wind and rain.
Gloves, overalls and a dust mask should be worn during filter changes.
The Filtration Unit MUST ALWAYS have the ATEX Panel Filter installed.
PARTICULATE FILTERS
To change the particulate bag and/or panel filter open the lid and secure open using
the integrated lid stay.
Slide the old filter out of their respective mounting channels.
Slide new filters into their respective mounting channels ensuring they are facing the correct direction
of flow, rubber seals should face downstream on both filters. The EX panel filter lid seal should be facing
upwards towards the lid.
Reconnect EX panel filter earth cable before closing lid.
REPLACEMENT FILTERS
SAFU/RF100 SA CYCLONE G4 ATEX Panel Filter
SAFU/RF105 SA CYCLONE F7 Bag Filter
SAFU/RF14 SA CYCLONE H14 Activated Carbon Cartridge - Single (9 per filter box)
SAFU/RF300 SA CYCLONE H13 HEPA Filter
