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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.

9.5.1. Cleanroom Ceiling Mounted Terminal HEPA Filter Systems

When selecting HEPA Filters For Commercial or Industrial Cleanroom Applications, many of the same rules apply to the process as are used in selecting HEPA filters for Medical or Biological applications. Cleanroom manufacturing processes require High Purity air filtration to protect the raw materials and the end product from particulate that can damage the product or cause it to fail in use.

Examples of industrial operations that rely on Cleanroom HEPA Filters include:

Semiconductor Manufacturing Pharmaceutical Manufacturing Medical Device Manufacturing Dental Device Manufacturing

Food Processing Plants Digital Device Manufacturing Computer Manufacturing

Cleanroom HEPA Filters Selection Factors - Industrial Cleanroom HEPA Filter Selection should be guided by factors such as:

ISO 14644-1 Cleanroom Classification Level (Replaces Federal Standard 209E-1992) Purpose of the Cleanroom Equipment and Room Layout

Temperature and Humidity Requirements Maintenance and Filter Access Ceiling System Design

Cleanroom HEPA Filter Systems Guide

Cleanroom Classification

The ISO 14644-1 Document Classifies Cleanrooms based on Particles per Cubic Meter at various particle sizes, according to the following Chart:

Class	Number Of Particles Per Cubic Meter By Micrometer (um) Size
	0.1um	0.2um	0.3um	0.5um	1um	5um
ISO 1	10	2
ISO 2	100	24	10	4
ISO 3	1,000	237	102	35	8
ISO 4	10,000	2,370	1,020	352	83
ISO 5	100,000	23,700	10,200	3,520	832	29
ISO 6	1000,000	237,000	102,000	35,200	8,320	293
ISO 7				352,000	83,200	2,930
ISO 7				3,520,000	832,000	29,300
ISO 8				35,200,000	8,320,000	293,000

Cleanroom HEPA Filter Selection

Selection of the optimum number of HEPA filters for any given cleanroom is related to the Classification of that specific cleanroom and the Ceiling Coverage required to produce the number of air changes for the targeted level of cleanliness, generally in accordance with the recommendations below:

Class		Ceiling Coverage	Mean Air Velocity	Air Changes Per Hour
ISO Class 8	(Class 100,000)	5-15%	1-8FPM	50-60
ISO Class 7	(Class 10,000)	15-20%	10-15FPM	60-150
ISO Class 6	(Class 1,000)	25-40%	25-40FPM	150-240
ISO Class 6	(Class 1,000)	25-40%	25-40FPM	150-240
ISO Class 5	(Class 100)	35-70%	40-80FPM	240-600
ISO Class 4	(Class 10)	50-90%	50-90FPM	400-750
ISO Class 3	(Class 1)	60-100%	60-90FPM	500-750
ISO Class 1-2	No Comparison	80-100%	60-100FPM	500-750

1. Actual average velocity and air changes required may vary depending on the application and floor plan.
2. ULPA (99.999%) HEPA filters required on Class 1/10 application, HEPA (99.99%) required on all others.
3. Figures assume standard airflow capacity of 650 CFM for a 24" x 48" HEPA filter module.

Converting the ratios into actual Recommended Numbers Of Standard Size 24" x 48" (Nominal) Ceiling Modules or HEPA Fan Filter Units, the chart below assists with the selection process:

Room Size	# Modules	Number Of 24"x48" Filter Modules For ISO 14644-1 Std
		Class 1-2	Class 3	Class 4	Class 5	Class 6	Class 7	Class 8
8´x8´	8	6-8	5-8	4-8	3-6	2-3	1-2	1
8´x12´	12	10-12	7-12	6-12	4-8	3-5	2-3	1-2
8´x16´	16	13-16	10-16	8-16	6-11	4-6	2-4	1-3
12´x12´	18	15-18	11-18	9-18	6-13	5-7	3-5	1-3
12´x16´	24	19-24	14-24	12-24	8-17	6-10	4-6	2-4
16´x16´	32	26-32	19-32	16-32	11-22	8-13	5-8	2-5
20´x20´	50	40-50	30-50	25-50	18-35	13-20	8-13	3-8

As can be seen in the charts, Class 1-2 applications require up to 100% ceiling coverage of HEPA fan filter units, Terminal HEPA filter units or Ducted Terminal HEPA Filter units to produce a laminar or uni-directional flow of clean air traveling downward at a velocity of approximately 90 feet per minute, as measured 6" below the filter face.

This design ensures a positive pressure inside the cleanroom, which prevents the infiltration of contaminants and also provides for the removal of particles generated by people and equipment in the work space.

Cleanroom HEPA Filter System Air Change Rate

Another important criterion is Air Change Rate - The ability of a system to move a volume of air through the system in a given time is usually expressed as air changes per hour. Because of the unusually high air change requirements of cleanrooms, the general air change requirements defined by ASHRAE standard 62.1 for occupied spaces is not relevant. Those air change rates are based on removal of CO2 and on occupant comfort.

In a cleanroom, the driving factor is contaminant removal and cleanliness level. Many cleanrooms also have stringent temperature and humidity tolerances, and may require humidification or dehumidification as part of the HVAC system. These systems, along with the HEPA filters, must be selected with attention given to operating pressure drop, energy efficiency and ease of maintenance.

Cleanroom HEPA Filter System Lifespan

HEPA Filters for Cleanroom environments can have a life span of 3-15 years or more, based on how well protected they are from larger particles and how well maintained the cleanroom is. Room-side replaceable HEPA filter modules are available in most applications. These HEPA modules allow replacement of the HEPA filter within the module, from the cleanroom side of the ceiling space. This eliminates the need to break the critical ceiling barrier, which would contaminate the cleanroom.

In addition, HEPA filter modules can be ordered with integral light fixtures for cleanrooms where most of the ceiling space is loaded with HEPA filters and there is no room for standard light fixtures. These Flow-Through HEPA Fan Filter Units or Side-Integrated Light Fixture HEPA Fan Filter Units are an economical choice, reducing wiring costs and saving space. Often, the HEPA filter pack depth is increased to accommodate the small HEPA face area with the Side-Integrated models.

Other Important Features Of HEPA Filter Modules For Cleanrooms

Cleanroom HEPA Filter Protection and Performance

Protection of HEPA filters in Cleanroom applications is a critical design decision. It is recommended that prefilters be at least MERV 8, 30-40% ASHRAE dust spot efficiency. Pleated air filters and 3-Ply Ring Panels/ Link Panels work well in this instance.

It is further recommended that final filters be installed between the prefilter and the HEPA filter, and that they have at least a MERV 13, 85% ASHRAE dust spot efficiency rating. Box Filters or Pocket Filters are ideal for this application. Alternatively, if space inside the air handling equipment is limited, you can select a Minipleat in a 4" depth that has a MERV 13, 85% rating as well. The life cycle will be shorter than the 12" or 6" deep box filters, or the 12´-36 " deep pocket filters, but you will be able to achieve the higher efficiency in the absence of deeper final filter space.

Make Sure You Get The Best HEPA Filter For Your Cleanroom
By Using The - HEPA Filter Selection Worksheet Or Call JD Supply At 866-800-9286

After Selecting Your Cleanroom HEPA Filter Units

Once you have selected the correct filters for the application, note the initial pressure drops for each filter bank and coordinate with the air handling unit provider to ensure the unit can handle the resistance to airflow and provide the flow requirements needed for the space.

Once HEPA filters are installed, retain the test reports received from the manufacturer, indicating the filters passed leak testing as manufactured. Have a certified testing agent perform in-situ leak testing on each HEPA filter, Particle counts and pressurization testing on each cleanroom environment. The agent will prepare a report of his findings and should advise you if any parameters are outside your requirements. This test and certification is normally done while the cleanroom is "at rest" or unoccupied.

It is also recommended that you have an "at work" test conducted once the cleanroom begins operation, to evaluate the performance of the system while there are people and equipment working in the space. If you find particle counts are outside required limits for the space, you need to look at your cleanroom protocol and determine if there are procedures in place of proper gowning, periodic cleaning and for disposable supplies validation.

Often, particulate is introduced to the cleanroom by cleanroom supplies that do not meet standards for cleanliness appropriate for a particular level of cleanroom. There may also be other sources of particulate not addressed during the design phase that need to be addressed at the source. Improperly pressurized pass-throughs, new process machinery that was not included in the original design, or off-hours cleaning personnel who have not been trained on proper cleanroom procedures.

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
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