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HEPA Filters - Discount HEPA Filter Outlet, New York

HEPA Filter Guide - Medical HEPA Filters, Industrial HEPA Filters, Residential HEPA Filters, Find The Optimum HEPA Filter For Your Application.
$SAVE$ - We Ship Quality HEPA Filters Anywhere In North America!

HEPA Filters Guide - Choosing The Optimum HEPA Filter For Your Application
By Jackie LoBuglio (JD Supply HEPA Filter Outlet)

HEPA Filters are now used in a wide range of applications including; Medical/Biological HEPA Filtration in clinics hospitals and research facilities, Commercial/Industrial HEPA Filtration in manufacturing and cleanroom facilities, and also Residential HEPA filtration for control of allergens. This HEPA Filter Guide explains the different types of HEPA filter available, and will help you understand how to choose the best HEPA filter for your particular application.

9.4.1. HEPA Filter Systems For Hospital and Healthcare HVAC Applications

HEPA filters for use in Medical treatment facility HVAC systems may take many forms. Consideration must be given to the projected use of the medical space being protected, the level of air cleanliness required, and the amount of air needed to properly ventilate the space. Examples of facilities that usually require HEPA filtration include:

It is highly recommended that a NAFA Certified Air Specialist, or a licensed professional engineer be consulted before any changes are made to any existing HEPA Filter systems. Typically, HEPA filters with efficiencies of 99.97% (on 0.3 micron particles) may be installed in general medical use areas such as treatment rooms, Outpatient Surgical Centers and Medical Laboratories. However, Operating Room Suites, Critical Intensive Care units and Isolation rooms should be equipped with HEPA filters carrying an efficiency of 99.99% or 99.999% on 0.3 microns.

The optimum location for any given HEPA filter varies with the application. Air handling units serving medical spaces can usually have HEPA filters installed upstream of the heating and cooling coils - provided there are prefilters of at least MERV 8 with 30-40% efficiency, and final filters of MERV 13 with 85% efficiency to protect the HEPA filter unit.

You must also be sure to take airflow resistance into account. HEPA filters can have initial clean pressure drops of 1.5 in WC or higher, and have a recommended final pressure drop of 2.0-2.5 in WC in most cases. If the air handling equipment is not sized to accommodate this added resistance, reduced airflow can be the result.

HEPA filters are often installed as terminal units, in place of the standard supply air diffusers within the medical space. They can be ducted or can be installed as part of an open plenum supply air distribution system. They are available as simple HEPA filter and housing units or can be equipped with an integral supply fan to aid in supply air distribution

There are many different styles of HEPA filter available, including standard disposable HEPA units (which are discarded once they reach the end of their life cycle), and room-side replaceable HEPA units (where the HEPA filter can be replaced from the room-side without disturbing the ceiling barrier). Room-side replaceable ducted terminal modules or room-side replaceable HEPA fan filter units are preferred, because the ceiling barrier remains intact during maintenance, thereby reducing the threat of contamination of the protected medical space.

9.4.2. HEPA Filters For Biological Safety Cabinets

Biological Safety Cabinets may have HEPA filters installed in various configurations. There are 3 main Classes of Biological Safety Cabinet:

Classification	Bio-Safety Level	Application
Class I	1,2,3	Biological Agents With Low-Moderate Risk
Class II	1,2,3	Biological Agents With Low-Moderate Risk
Class III	4	Biological Agents With High Risk

Class I Biological Safety Cabinets
For Personnel & Environmental Protection Only

A Class I Biological Safety Cabinet protects the environment, but does not protect the product from contamination because "dirty" room air constantly enters the cabinet front to flow across the work surface.

Class II Biological Safety Cabinets
For Product, Personnel, & Environmental Protection

A Class II Biological Safety Cabinet must meet requirements for protection of the product within the cabinet space, personnel, and the environment. This type of cabinet is widely used in clinical, hospital, life science, research, and pharmaceutical laboratories.

In general, Class II Biological Safety Cabinets are Classified according to the method by which air volumes are recirculated or exhausted. The Class II Biological Safety Cabinet has 3 key features:

Vertical, unidirectional airflow and a front access opening are common to most Class II cabinets. But, because Class II designs permit different airflow patterns, velocities, HEPA filter position, ventilation rates and exhaust methods, a sub-Classification of Type is needed to differentiate Class II designs.

It is important to understand the difference in Biological Safety Cabinet Types, in order to select the optimum cabinet for your specific application. This next chart will assist with that process:

9.4.3. Laminar Flow or Uni-Directional Flow Clean Benches

The Laminar Flow Clean Bench is a workbench or similar enclosure, which has its own filtered air supply. The clean bench was developed as an adjunct to clean room technology (the need to protect the work area and work products from contamination). In recent years, the use of the clean bench has spread from research and manufacturing to other fields such as aerospace, bioscience, pharmaceutical production and food processing.

Clean Bench Function - The clean bench provides product protection by ensuring that the work space in the bench is exposed only to HEPA-filtered air.

Horizontal Laminar Airflow - The clean bench or "hood" is a work area with its own HEPA-filtered air supply. Protection is provided by capturing room air, passing the air through a HEPA filter, and directing the filtered air horizontally across the work surface at a constant speed toward the user.

Air Cleanliness Classification - In US Federal Standard No. 209E (Revised Sept.11,1992) the US Government provides requirements for 3 Classes of air cleanliness. Classifications are based on particle counts taken at a location within the clean bench, which will yield a particle count of air as it approaches the work location. It is important to note that government Classifications reflect performance when the bench is "at rest", or free of materials or work activity within the hood.

Air Cleanliness Classes, ISO 14644-1
ISO 5 (Class 100)	Particle count not to exceed a total of 100 particles per cubic foot of a size 0.5 micron and larger.
ISO 7 (Class 10,000)	Particle count not to exceed a total of 10,000 particles per cubic foot of a size 0.5 micron and larger, or 65 particles per cubic foot of a size 5.0 micron and larger.
ISO 8 (Class 100,000)	Particle count not to exceed a total of 100,000 particles per cubic foot of a size 0.5 micron and larger, or 700 particles per cubic foot of a size 5.0 micron and larger

Note - When replacing your Biological Safety Cabinet HEPA filters, you must record the cabinet Manufacturer, the Model Number and the Serial Number to ensure you replace it with the same exact size and configuration of filter. Some cabinets require a Supply HEPA filter and an exhaust HEPA filter, as well as a Prefilter.

Replacement Filters Biological Safety Cabinets And Laminar Flow Benches:
To Find The Correct Filter For Your Cabinet Call JD Supply At 866-800-9286

9.4.4. Operating Room Ceiling Mounted Terminal HEPA Filter Systems

Operating Room Ceiling diffusers can be replaced with Operating Room Ceiling Mounted Terminal HEPA Filter units to further protect the patient from airborne particulate and bacteria. Resistance of the HEPA filter media must be taken into account, and room-side replaceable units are highly recommended to eliminate the need to break the containment-ceiling barrier during routine HEPA filter media replacement. Standard sized units for this application are typically designed to drop into 24" x 24" or 24" x 48" suspended ceiling grids. For hard ceilings, units can be installed with trim kits and gasketing for a flush seal.

9.4.5. Isolation Room Portable HEPA Filtration Units

If a disaster response includes the need for patient isolation to contain disease and/or to protect healthcare workers; the number of individual patient isolation rooms becomes important.

The 2007 Hospital Preparedness Program guidelines discuss implementing a bed tracking system, and one of the categories is negative pressure isolation to contain infectious diseases.

Abatement Technologies HEPA-CARE Air Purification Systems, with 99.99% efficient HEPA filters at 0.3 microns, are Class II medical devices. They convert standard patient rooms into CDC, OSHA and ASHE/AIA-compliant PE and/or AII rooms at a fraction of the cost of typical "design and build" methods.

You´ll have the flexibility to relocate air filtration equipment to another room quickly, adding isolation wards or patient isolation surge capacity to new or existing facilities easily. Portable air purification models roll quietly to wherever you need them at a moments notice. Used for days, weeks or months at a time, these highly mobile units provide the greatest flexibility to economically increase surge isolation capacity.

For permanent HEPA filtration, ceiling-mounted air purification models install flush with the ceiling grid and are the perfect choice for Patient Isolation Rooms. Ceiling mounted models are completely out of the way and offer the highest level of tamper-resistance.

9.4.6. Bag In and Bag Out HEPA Filtration Systems
For Biological Safety Level (BSL) 1-5 Facilities

Bag In and Bag Out Systems are designed to meet the air filtration needs of industrial, research and military facilities that handle dangerous biological, radiological or carcinogenic materials. They are designed to protect maintenance personnel from potentially harmful contaminants in the filtration system during filter replacement.

Bag In and Bag Out HEPA Filtration units are high quality, high efficiency systems designed to capture dangerous toxic, or noxious airborne contaminants, both gaseous and particulate, and to contain them until disposed of properly.

Bag In and Bag Out HEPA Filtration Units are used widely across many industrial sectors, including those associated with general ventilation and air conditioning systems, Department of Energy containment filtration systems, Department of Defense CBR systems, also known as NBC systems, hospital TB isolation rooms, pharmaceuticals, genetic and biotech facilities, universities, nuclear power and nuclear materials processing.

Items required for a Bag in and Bag Out housing include:

The procedures for changing out filters in a Bag In / Bag Out facility are complex and should be executed by qualified change-out professionals. The National Air Filtration Association offers a training course on this subject and it is highly recommended that you use only NAFA Certified Technicians to accomplish this task, unless your staff has been fully trained.
Steps To Perform A Standard Bag In / Bag Out Filter Changeout

HEPA Filter Summary

HEPA Filter Selection requires thorough knowledge of your particular application and the full range of HEPA Filters that are available today. JD Supply can provide You with NAFA Certified Air Filtration Specialists available to answer Your questions and help you make Your optimum choice. We can also offer You an extensive library of resources, experience with selecting, installing and certifying HEPA filtration systems, and access to a multitude of HEPA filtration products to suit Your specific needs.

$SAVE$ - Medical HEPA Filters, Industrial HEPA Filters, Residential HEPA Filters
Buy Online: Discount HEPA Filters & Discount Air Cleaners From JD Supply HEPA Filter Outlet! Can´t Find It? Or For Custom HEPA Filters Call: 1-866.800.9286
We Ship Quality HEPA Filters Anywhere In North America!