Ducting vs. filtration considerations: Energy

1
Ducting vs. filtration considerations Energy
cost savings
Ducting
Filtration
Energy used by 13 amp plug Cost of running 13 amp
plug Changing filter (typically) every 2
years Downtime lost is only per fume cupboard
Energy used in running fans associated
controls Ducting out replacement of ??? cubic
metres of conditioned laboratory air Cost of
energy plus cost of planning, design, procurement
and installation of ducting HVAC systems Cost
of related BMS systems Cost of downtime lost due
to maintenance of roof, fans or ducting all
fume cupboards are out of commission, not just one
2
Ducting vs. filtration considerations
Flexibility
Ducting
Filtration
Movable and flexible. Can be mounted on a bench,
relocatable stand or mobile trolley Only require
a 13 amp plug connection Can be positioned in a
much wider choice of positions Laboratory use can
be changed quickly
All ducted fume cupboards need connection to a
duct system and wiring to a fan(s) Not easily
moved or installed, limited by need for a duct
route Planning permission not always given
3
Ducting vs. filtration considerations User
comfort
Ducting
Filtration
Motorised adjustable height stand/trolley
available for cabinet users of varying build Four
clear sides for all-round visibility and
vigilance All-round exposure to natural light,
enhanced by internal lighting
Working height is fixed Panel surround allows no
natural light on work area
4
Ducting vs. filtration considerations Diversity
Ducting
Filtration
100 of cabinets can be used 100 of time No
under-use of investment
Typical 60 70 diversity gives
under-utilisation of capacity and equipment cost
5
Ducting vs. filtration considerations Velocity
containment
Ducting
Filtration
Fixed sash opening gives constant airflow and
containment
VAV systems are expensive may not guarantee the
required, consistent level of containment at
different airflows Variable speeds place more
stress on the fan(s) gt higher maintenance
6
Ducting vs. filtration considerations
Interaction between disciplines
Ducting
Filtration
Our range of movable recirculating Fume
Cupboards, Safety Cabinets and Laminar Flow
cabinets enable different disciplines to mix and
combine within the same area
Fume cupboard and safety cabinet ducting
requirements are not compatible separate
systems are necessary for each
7
Ducting vs. filtration considerations
Environment
Ducting
Filtration
Fumes removed disposed of in a controlled
environment
Fumes emitted into local environment Possible
future environmental legislation
8
Fume cupboard duct system installation
elements of cost

Make up air
Diversity
Installation
Design
Planning
MONAIR
DUCTED