Labconco Protector Filtered Glove Box - Manual (Page 43)

Chapter 6: Maintaining Your Glove Box
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Determining When to Replace Filters
The HEPA or ULPA filters in the filtered glove boxes gradually accumulate
airborne particulate matter and powders from the enclosure and room. The
rate of accumulation will depend upon the cleanliness of the room air, the
amount of time the enclosure is operating, and the nature of work being done
in the enclosure. In typical installations and usage, the filters will last two to
five years before requiring replacement. Replace filters if the speed control is
adjusted to full speed and the airflow is half its normal starting point.
Replace filters if it fails the HEPA or ULPA Filter Leak Test in Chapter 6.
How to Install New Filters
The Protector Filtered Glove Boxes include a true bag-in/bag-out filter
disposal system for safely removing the filter and protecting the worker from
toxic powders and particulates (see Figure 6-1, Filter Changing Diagram).
The accessory bags can be ordered from Labconco (see Chapter 7). Two
bags will be required for each HEPA or ULPA filter for a total of 4 each to
complete the change process. For your safety, wear appropriate personal
protective equipment during the change of filters. If working with micro-
biologicals, use the decontamination procedure referenced above. (Consult
your Safety Officer before performing filter changes).
1. Turn the glove box OFF. Refer to Appendix A for replacement parts
and Appendix B for dimensions. Remove the top metal cover.
2. Loosen the six filter nuts that secure each filter.
3. Place the accessory bag over the filter and seal to the filter housing.
4. Place both arms in the rear gloves of the bag, and carefully draw the
filter out of the glove box. Rest the filter on the floor, table or cart.
Remove arms from bag gloves.
5. Create two seals between the glove box filter housing and the old
filter. Seals can be heat sealed or sealed with tie wraps. Cut off the
bag between the two seals and leave the bag stub on the filter housing
port to the glove box.
6. Place the new filter in another new bag. Then place the new bag with the
new filter over the old bag stub and onto the glove box filter housing.
7. Carefully remove the old bag from the filter housing using the single glove
near the access port. Draw the old bag and stub into the single glove and
turn the glove inside out. Double seal this glove on the contaminated bag
stub inside. Remove the bag and dispose of properly.
8. Carefully install the new filter and uniformly tighten the six filter nuts
until the filter gasket is compressed 50%. Then roll up the second
filter bag, secure with strap and leave in place for the next filter
replacement procedure.