Envirco NSF Biohazard Cabinet Manuel d'utilisateur télécharger pdf (Page 21)

XI. FILTER REPAIRS

Caution: If the cabinet has been used with infectious agents, decontamination

is necessary before removing access panels.

Shipping movement and handling may cause filter leaks. These leaks can normally

be repaired as follows:

1. Caulking with silicone RTV can usually repair small leaks in the filter media

or at an adhesive joint from the downstream side of the HEPA filter.

2. Leaks at gasket seal may also be stopped with the RTV sealant on the

downstream side. If leaks cannot be stopped from the downstream side, the

cabinet access panels must be removed.

3. To seal major leaks in gasket or filter media, first remove main access panel

then the inner filter access panel to expose upstream side of filter. Remove

filter and seal leaks by pouring rubber base cement down into leaking area.

Check for separation at gasket corners and repair with silicone RTV. Put

silicone grease on gasket surface before re-installing filter to improve gasket

seal.

4. Re-install filter access panels, and retest. Put silicone grease on exterior

door gasket before re-installing on the cabinet. Do not over-tighten access

panel screws. Replace the tubing on the magnehelic gauge and reconnect

the warning buzzer. Replace the filter screen and exhaust damper housing.

Set the damper with blades about 3/8 inch open to begin airflow adjustment.

Figure 7: Supply HEPA Filter

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Envirco NSF Biohazard Cabinet Manuel d'utilisateur Page 21