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36 F300S/F300SQ Ultraviolet Lamp System
Remote Blowers
An optional remote blower package is available from Fusion UV Systems. The
package includes an air distribution plenum (for multi-lamp systems), inlet filter box,
and flexible hoses or ducts for cooling the system. The blower delivers 2.8 m
3
/min
(100 cfm) of air to each irradiator inlet at 695 Pa (2.8" H
2
O). See Chapter 6,
“Maintenance” for information on the measurement procedure.
Irradiator Exhaust Venting
Fusion UV Systems recommends that 3.6 m
3
/min (130 cfm) of air be exhausted from
each irradiator. The air flow must be vented below the irradiator to prevent back
pressure buildup, which would reduce the flow of cooling air. An exhaust fan is
recommended to draw hot air and ozone away from the UV lamp and discharges them
to the outside. The fan must remove at least 30% more air than is supplied to the
irradiator inlets so a negative pressure will exist under the lamps. The makeup air
enters through the UV shielding louvers or any other vents in the light shielding
enclosure.
Light shielding louvers are recommended. At least 142 cm
2
(22 sq. in.) of louvered
area is recommended for each irradiator to allow free flow of make-up air. If the
exhaust air is not vented outside the building care should be taken to prevent it from
recirculating into the inlet of the blower(s).
Quartz Plates
To protect the material being cured, quartz plates may be mounted below the UV lamp
to block the air carrying heat away from the bulb. A typical mounting design is shown
in Figure 8 on page 37. Details of the mounting structure depend upon the position and
location of the irradiator and UV shielding.
Clearance C prevents the substrate from striking and breaking the quartz plate but
varies with the application. Distance D should be at least one inch and as large as
practical to provide maximum area for the escape of cooling air (see Figure 8 on page
37).