Germfree BZ Series, User Manual

Page: 9 / 53

Horizontal Laminar Flow Workstation
User Manual
9
Filter Diffuser
The HEPA filter is located behind a removable, perforated metal diffuser . Do not push items such as needles
through the diffuser holes and do not hang items from any part of the diffuser . Due to the Ultra-clean air
passing over the backside of the diffuser, it does not need to be cleaned regularly . The diffuser should only be
removed by your certifier, and at that time the backside can be cleaned thoroughly .
During routine cleaning the diffuser will still attached . Do not spray the diffuser with an aerosol or pump
dispenser because you might spray the filter . If an occasional spray mist gets on the filter, it should dry and not
cause a problem . The diffuser should be cleaned with a cloth saturated with cleaner . Due to the air pressure
coming across the diffuser, any drops that penetrate the diffuser will not come into contact with the HEPA
filter . If there is major damage to the diffuser, a certifier should be notified, and the filter should be tested
immediately, and work should cease inside the hood .
Acrylic Top and Sides
The transparent acrylic top and sides of the work area are designed to provide optimal light in the work area .
Many chemicals have an adverse effect on acrylic plastics . Never use gritty soaps or household cleansers such
as Comet or Ajax . Acrylics are attacked by concentrated alcohols, strong solvents, chlorinated hydrocarbons and
many aromatic hydrocarbons . They are also adversely affected by ultraviolet light .
Acrylic is unaffected by most inorganic solvents, minerals and animal oils, low concentrations of alcohols,
paraffinic and olefinic hydrocarbons, amines, alkyl monohalides, esters containing more than ten carbon atoms,
alkalines, no-oxidizing acids, salt water, photographic solutions and chemicals, petroleum oils and greases,
household cleaning products and chemicals used in the treatment of water . For cleaning, 50% Ethyl Alcohol, 70%
Isopropyl Alcohol, or a Clorox solution can be used . Do not use 95% or 70% Ethyl Alcohol, 99% Methyl Alcohol or
Windex .
Over time, the acrylic glass will experience standard wear and tear . If the acrylic becomes too scratched or
cloudy, and it begins to impede on the work being done in the hood, it will need to be replaced to maintain the
optimal level of light over the workspace . You will be responsible for determining when the time has come to
replace the acrylic . Only qualified personnel should replace the acrylic, as holes need to be drilled and some of
the hood needs to be dismantled and reassembled .