Gentek 3980421 User Manual

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Chapter 3: Getting Started





Filter Type

Appropriate Use



HEPA filters are high-efficiencyparticulate



air filters having a particulate removable



efficiency of 99.99% for particles with a



diameter of 0.3 micron.

Organic Vapor

Adsorbs organic compounds designated by

Activated Carbon

NIOSH guidelines as acceptable for use with



chemical cartridge-typerespirators.



Concentrations in the enclosure’s work area



must not exceed the IDLH for the chemical



and the exhaust from the enclosure must not



exceed the TWA.


Formaldehyde requires the use of an


impregnated carbon for the treatment of



formaldehyde. Concentrations in the



enclosure’s work area must not exceed the



IDLH for the chemical and the exhaust from



the enclosure must not exceed the TWA.

Ammonia and

Treats ammonia, low molecular weight



amines and other bases designated by NIOSH



as acceptable for use with ammonia cartridge



type respirators. Requires the use of an



impregnated carbon. Concentrations in the



enclosure’s work area must not exceed the



IDLH for the chemical and the exhaust from



the enclosure must not exceed the TWA.

Important: Carbon filters do not provide any particulate protection, but provide odor control.

Connecting the Electrical Supply Source to the Filtered Enclosure

115V Models

Simply connect the 115V power cord supplied to the IEC electrical supply plug on the back of the enclosure. If using at 50 Hz operations, blower performance maximum airflow will be reduced by 17%.

230V Models

The above procedure applies for the 230V except it is shipped without a plug. Install the appropriate plug for your electrical specifications per local codes.


Chapter 3: Getting Started

Set the Face Velocity with the Speed Control Adjustment

Adjustment of the speed control gives the correct face velocity and is located behind the front panel. The face velocity should be from 75 to 105 fpm for biohazardous operations. (Consult your Safety Officer for airflow recommendations for your application). Containment is maximized at a setting within this range. Working at the lowest face velocity appropriate for the application will give the quietest operation. Face velocity measurements are made using an anemometer. An electric anemometer can be obtained from your laboratory supply dealer. Face velocity measurements should be taken in accordance with the Industrial Ventilation Manual. Using a small Phillips screwdriver, adjust the speed control to give the required face velocity. See Figures6-1and6-2in Chapter 6 to locate the speed control. The face velocity is increased by turning the speed control counter clockwise and clockwise to decrease face velocity.

Validating the Vented Enclosure

To determine the actual face velocity at the sash opening, airflow velocity readings are taken. This should be done across the sash opening of the enclosure in accordance with the Industrial Ventilation Manual. (See Appendix E) The “average face velocity” is achieved by taking readings in two rows across the enclosure with the readings 6" from the ends and evenly spaced every 12"; the first row is 3" down from the upper sash foil and the second row is 3" up from the work surface. A total of four readings will be taken for the 2' enclosure, six readings taken for the 3' enclosure and eight readings taken for the 4' enclosure and then averaged. Refer to Chapter 2 for proper airflow volumes for your particular model.

The Purifier enclosures have been tested at Labconco’s airflow test facility per ASHRAE 110-1995.All enclosures achieve an “as manufactured rating” of less than 0.05 part per million (ppm) at 4 liters per minute (lpm); AM <0.05 (Consult Labconco for individual ratings). For “field use” ASHRAE testing contact Labconco for a certifiedon-sitecontractor. Labconco also performed extensive ASHRAE testing to validate the enclosures for gas containment. For copies of these validation reports, contact Labconco Customer Service.


Chapter 3: Getting Started

The Purifier Enclosures were also subjected to Biological Containment testing, using a modified Personnel Protection Test, as described in NSF/ANSI Standard Number 49. An aerosol challenge of approximately 5 x 108 spores ofBacillus subtilus var Niger were released in the enclosure and appropriate air sampling equipment established the number of spores that escaped through the sash opening. Each size enclosure was tested three times. All three sizes of the enclosure were tested at 75 FPM inflow and typically 1 or less than one spore escaped from the enclosure during each of the tests.

The Purifier Enclosures were also subjected to an industrial hygiene air-monitoringstudy to confirm the performance of the enclosure for powders. The Purifier Enclosures demonstrated excellent containment when used by an operator using excellent technique and good containment when used by an operator using marginal technique. While no enclosure can compensate for improper technique, these tests confirm the Purifier Enclosures provide a safe working environment.

NOTE: Face velocity profiles and smoke testing ! should be performed frequently per your

organization’s quality system to ensure safe performance.

Sealing the Filtered Enclosure to the Work Surface

When the filtered enclosure has been set in place, ducted, (if necessary), and wired, it may be sealed at the work surface to prevent spilled materials from collecting under the walls. A bead of silicone sealant is recommended to seal the filtered enclosure to the work surface.






High Performance Features:

The patented* Purifier HEPA Filtered Enclosure and Purifier Class I Enclosure are designed to meet the needs of the laboratory scientist, and provide superior containment while operating at velocities between 75-105feet per minute. The filtered enclosures have been tested to effectively contain toxic, noxious, and biohazardous materials when properly installed and operated. What makes the filtered enclosures so unique is the revolutionary way they direct air into and through the contaminated air chamber. Labconco engineered the filtered enclosures to minimize the effects of turbulence. Thecontainment-enhancingand aerodynamic designs of the upper sash foil, side air foils, lower air foil, upper dilution air supply, and rear perforated baffle all work in concert to produce horizontal airflow patterns that significantly reduce powder, chemical and biological material concentrations through the work area.

*(U.S. Patent No. 6,461,233)


Chapter 4: High Performance Features and Safety

These concentrations of materials are predominantly removed on the “first pass” of airflow through the chamber resulting in high performance containment.

The plenum and the HEPA filter are jacketed by negative pressure. Should a leak occur in the filter gasket or the plenum, the contaminated air is recaptured and refiltered.

The Purifier Class I Enclosure and Purifier HEPA Filtered Enclosure have an access port located behind the front panel. For HEPA filter removal in biohazardous applications on Purifier enclosures, the HEPA filter will require decontamination before removal. Users of all equipment are encouraged to routinely check airflow or purchase a model with an airflow monitor.


Chapter 4: High Performance Features and Safety















Not Shown 7, 9, 10, 11, 12, 13, 20, 21, 22, 23, 24, 25, 28 (See

Figure 4-2)

Figure 4-1


Chapter 4: High Performance Features and Safety

Figure 4-2

HEPA Filtered Enclosure Airflow Diagram


Chapter 4: High Performance Features and Safety

1.Aerodynamic Clean-Sweep™Air Foilhas a unique shape that allows air to sweep the work surface for maximum containment. The Clean-Sweep™ openings create a constant protective barrier from contaminants. Should the operator inadvertently block the airflow entering the air foil, air continues to pass under the air foil and through the Clean-Sweep openings. See Figures 4-1 and 4-3.

Figure 4-3

2.Containment-EnhancingUpper Sash Foilincludes an open air passage directly atop the sash foil to bleed air into the hood chamber and direct chemical, powder and particulate materials away from the sash opening. The radiused sash foil sweeps airflow into the hood with minimal turbulence. See Figures 4-1 and 4-4.

Figure 4-4


Chapter 4: High Performance Features and Safety

3.Upper Dilution Air Supply provides bypass air from above the work area. This feature constantly bathes the inside of the sash with clean air and reduces powders, particulate materials and chemical fumes along the sash plane, near the critical breathing zone. Five to seven percent of the required air volume is introduced through the upper dilution air supply. The upper dilution air supply also reduces stagnant pockets of air in the upper interior. See Figure4-2.

4.Zoned Rear Perforated Baffle directs horizontal laminar air streams to thethree-zonedsections of the perforated baffle. Thethree-zonedsections have increasingly more open area at the bottom that help form laminar airflow. This minimizes the potential for air to roll forward preventing contaminants from moving toward the sash opening. The majority of contaminants are highly diluted, captured and removed on the first pass through the enclosure. See Figures4-1and4-2.

5.Side-Entry Air Foils allowturbulence-freeair to enter the enclosure from the sides and allow clean air to sweep the interior walls of the enclosure. See Figures4-1and4-2.

6.Ergonomic Slope of 10 degrees provides maximum visibility, and comfort reduces glare, thereby minimizing operator fatigue. See Figure4-1.

7.Internal Depth of 23" provides necessary depth to support modern balances and other auxiliary equipment without extending outside the enclosure or resting on the lower air foil. See Figure4-1

8.Safety Glass Sash with Spring-LoadedLatchhas a wiping seal to contain contaminants and features a springloaded latch to secure sash open for loading and cleaning. The sash must be down for normal operation. See Figure 4-1.

9.Utility Ports with Iris allows electrical cords and data cords to pass through the back of enclosure without leaving a large hole for contaminants to escape. The enclosure ships with solid plugs. Iris plugs are included with the User’s Manual. See Figure4-1and4-2.

10.Accessory Guardian™ Airflow Monitor continuously monitors airflow. An audio/visual alarm alerts the user to low airflow conditions. The Guardian™ Airflow


Chapter 4: High Performance Features and Safety

Monitor is an available option on all Purifier models. See

Figure 4-1and4-2.

11.Inherently Safe Impeller has a negative pressure plenum that surrounds the positive pressure impeller so that if a leak should occur, the unfiltered air is captured and refiltered. See Figure4-2.

12.Vibration-IsolatedMotorized Impellerhas vibration isolation supports, which eliminates transfer of vibration to the work surface. This is extremely useful in weighing operations with precision balances. The impeller wheel is also dynamically balanced. See Figure 4-2.

13.Speed Control regulates the speed of the motorized impeller and is used by the certifier to validate and adjust the inflow velocity. Located behind the front panel. See Figure4-2.

14.Space-Saving Design increases effective laboratory workspace, because the impeller and HEPA filter are contained within the enclosure, a separate filtered blower module is not required. See Figure4-1

15.Fluorescent Lamp is located above the work area, out of contact with contaminated air. A safety glass window beneath the lamp distributes the light evenly across the work surface. See Figure4-1.

16.Filter System Pressure Gauge indicates the total system pressure across the HEPA filter and pressurized plenum to help predict HEPA filter loading. See Figure 4-1.

17.Filter Clamping Bolt evenly seals the HEPA filter to the frame of the enclosure. See Figure4-1and4-2.

18.Sash. The sash is constructed of 1/4 inch tempered safety glass. It pivots up for loading and cleaning. See Figure4-1

19.Control Panel. The control panel, which is located above the sash, contains the filter system pressure gauge, control switches and the electronics. See Figure4-1.

20.HEPA (High Efficiency Particulate Air) Filter is rated to remove 99.99% of all particles 0.3 micron in size. See Figure 4-2.