1. What’s New in The NAFA Guide to Air Filtration, 5th Edition
CAFS Update Training:
What’s New in The NAFA Guide to Air Filtration, 5th Edition
Chris Zaker, CAFS, NCT
National Sales Manager Glasfloss Industries

2. Presented by the National Air Filtration Association
Refreshing Your CAFS
Presented by the National Air Filtration Association
The 5th Edition of the NAFA Guide to Air Filtration is produced and available. The new information contained in the text has been put into the questions on the CAFS exam. Those with existing CAFS must be aware of the new information and this tutorial provides the highlights of the changes. A full reading of the text is encouraged for a more complete understanding of the new information contained in the text.

3. 1990 - Today Continued development on media
Filter manufacturers and research institutions continue their work on developing better medias and nano-fibers may represent the next generation of filters with higher efficiencies and lower pressure drops. We in the air filter industry must be sure are up-to-date on the latest technology – including using the same language when speaking about filtration. Using the word “micrometer” instead of “micron” and “pocket filter” instead of “bag filter” along with calling a “pleat” either a “pleated filter” instead of a “pleated panel” (since it is not a panel filter – see chapter 2) are just small things that set us apart from the rest of the industry that retains “old language” this is confusing and misrepresents our product.

4. Wells-Riley Addendum 1.1
Wells-Riley was a Model for Ventilation procedure for determining how much outdoor air was needed to Dilute risk of indoor air “contagion” from infecting others.
The Wells-Riley – Filtration NAFA Research project by Dr. Brent Stephens, provided NAFA with a wealth of information regarding the ability of filters to remove airborne contaminant diseases thereby reducing the spread of these diseases. In addition, it challenges the notion that ventilation alone is the only answer to clean air. The Wells-Riley Filtration research is referenced many times in the 5th Edition of the NAFA Guide.

5. Filter Efficiencies Below 0.1 µm
MERV tells us the removal percentage of particle sizes.
Married – the
Two present
the efficiency
of a filter to
Remove
contagion just
like ventilation.
The latest research shows something we have known but not acknowledge about all filters – there are higher efficiencies below the most penetrating particle size. Resent studies show why MERV 13 and above filters have positive effects on the indoor environment – because they filter out bacteria and smaller particles below 0.1 micrometers.

6. Risk Reduction With Filtration
From no filter to MERV 13:
From 11 out of 34 children
infected w/ flu to 5 out of 34
This information shows a modeled a 55% reduction in the spread of influenza in the school environment by using MERV 13 or better filtration. This is the kind of useful information NAFA Members can present to school personnel to show the advantages of higher level of filtration.
Dr. Brent Stephens-Illinois Institute of Technology-2014

7. Some Sample Questions
1 Millionth of a Meter is called a __________? Micrometer or Micron The air we breathe is composed mainly of __________? Nitrogen
Answers show up on click.

8. Sample Questions
The size of particles in outdoor air are mainly ???% and smaller? 1 Micrometer and smaller _____(size) particles behave like a gas, have negligible settling rates and are affected by Brownian Motion. Particles less than 0.1 micrometers

9. Chapter Two & Three Nothing New…But
If, in a system, the static pressure is +3” wg and the velocity pressure is -3” wg…what is the Total Pressure?
+3”
-3” 0”
None of the above
This is the kind of “trick” question that is not found on the exam – although above. it really is not a trick question for those who understand and apply pressure information in a system. There is no such thing as negative velocity pressure – it can only be positive so the answer is none of the above.
It is important to know little details as they can be the difference between a retrofit system that performs well – and one that causes problems for the facility.
What happens when we lower the pressure in a system by using lower pressure drop filters? Answer – increased velocity – and where does this increased velocity go? Through a coil where it might cause condensate issues like blow-through. We have to be concerned now with the whole system.

10. Chapter Two & Three
If one 24 x 24 extended surface filter has 52 square foot of media and is installed in a system with 2000 cfm, what is the fpm through any square foot?
38.46
0.26
9.61 13
Here you have to convert cfm to fpm before you do the math. Again, using the information correctly is paramount to understanding how a filter will function in an airstream.

11. Chapter Four
If a pleated filter is an extended surface filter and a panel filter is one where the media velocity and face velocity are the same…What is a pleated panel?
A filter with extended flat media
A filter with flat media extended into pleats
Old terminology – just like “bag filter”
A conundrum
Emphasize “old language”

12. Chapter Five Most penetrating particle size for a filter is;
Depends on the media and velocity of the particle
0.3 micrometers
0.2 micrometers
Depends on the size of the particle
No just 0.3 micrometers….understand the system and how a particle may not be captured just on its size alone.

13. Chapter Six No major changes…but
A possible advantage of electronic air cleaners is:
lower pressure drop
Handles higher velocities
Less maintenance
Handles high RH air
Review

14. Chapter Six Agglomerators worked but; Too big
Collector plates carbonized
Voltage drop was a problem
Pressure drop was an issue
Review

15. Chapter Seven
History of Air Filter testing was added – deleted from text and charts All listed under heading “Retired Standards” for your reference 52.2 – 2012 – more information
We purposefully printed the obsolete Standards in the book so that NAFA Members can take the text and show facility personnel that is not the current Standard. Again, facts defeat doubt.

16. Chapter Seven EN-779 updated from 2002 to 2012
UL Class 1 and Class 2 references removed to indicate all filters now tested for UL Classified
Move of 52.1 test data for dust arrestance and DHC for air cleaners with >20% in E3 range (MERV 1-4)
All of the Standards in the 4th Edition are now “dated” and updated references were made to these Standards. The UL Classification is probably the biggest change here since it was the most recent (even though it wasn’t recent).

17. Chapter Eight
The difference between “leak tested” and “scan tested” according to IEST is;
The filter is subjected to visual inspection for scan testing
The filter is subjected to larger particles for leak testing
The filter is completely encapsulated for leak testing
Scan testing gives a % penetration of the challenge
NAFA Members have to know the difference between leak and scan tested HEPA filters. As HEPA filters become necessary for the reduction of worldwide outbreaks of pandemic-type diseases, Emergency Rooms, pre-diagnostic Rooms, ICU’s and other areas of the hospital and healthcare environments must have these….and they must be leak tested – preferably “in-situ” leak tested, to assure they have integrity. Pin hole leaks in HEPA filters render them ineffective when looking to remove viruses.

18. Chapter Eight
Chart added showing filter efficiencies below 0.3 micrometers EN 1822 – 2009 updated to EN 1822 – 2012 HEPA filter Aging – Life in Service paragraph added at end of chapter*
Charts added, Standards updated, and the HEPA aging question added with reference to Dr. Melvin First of the Harvard School of Public Health. One of the pioneers in HEPA filter testing, Dr. First theorized that the unknown in HEPA filter manufacturing including; when it was manufactured, how long it stayed on the manufacturers shelf, when and how it was shipped, how long it sat on the users’ shelf before install, the amount of cleaning chemical odors passed through the filter, and many other variables should cause it to be changed every 5 years (instead of on pressure drop).

19. Chapter Nine
All information regarding Industrial Finishing moved to Chapter 16
Pharmaceutical Compounding USP 797 information add to Chapter
Commercial Kitchen Ventilation Hood Filters section added to chapter
Emphasis is on US Pharmacapia An opportunity here for all NAFA Members to test and replace these HEPA filters in every hospital.

20. Chapter Ten
Class II Biological Safety Cabinet information updated and listed.
Next update will include AII and Protective Environments in hospitals – with Hospital and Healthcare Guidelines reference
Information updated on Biological Safety Cabinets

21. Chapter Eleven
Testing of media – ASHRAE and was added to the end of the Chapter
Molecular (gas-phase) filtration will also take a prominent role in total filtration and the new testing Standards for molecular media mirror the 52.2 testing for particulates. NAFA Members should better understand the application of molecular media so that inclusion into buildings trying to secure net-zero energy usage can be achieved.

22. Chapter Twelve
Human Physical Response was added after the introduction to explain the cause/effect of an immune system response to stimulus
ANSI/ASHRAE Standard 62.1 updated from 2004 to 2013 – many changes in terminology and descriptions of Air Classes and Redesignation
(Read all of his new information before presenting). Detail each for the Members.

23. Chapter Twelve
In IAQ Procedure – updated reference added by Burroughs and Bayer on application
Natural Ventilation section added
MERV 13 references added where applicable
Heathcare Facilities section added
Smoking Areas section corrected/updated
All 2004 references updated to 2013
Relate (quickly) the updated application by Barney Burroughs and Charlene Baer. Again, this information shows the value of molecular filtration and a great application.

24. Chapter 13 Chart removed showing prices of filters and energy costs
“Using Prefilters to Extend Filter Life” revised and “Removal of Prefilters” section added

25. Chapter Fourteen & Fifteen
Both new and added in 2007 Edition…nothing new added to these chapters
Bu it always helps to refresh you memory about the information found in these chapters.

26. Chapter Sixteen
Industrial Finishing information from Chapter 9 updated and moved to Chapter 16
Updated pictures and references – more complete explanation of systems
Supply Air explained – Exhaust Air explained then system balance
Much more information on cleaning of supply/exhaust air
All new and a must study chapter. Much more information and references included for this chapter.

27. Chapter Sixteen
Much more information and pictures of overspray removal
References to Federal Regulations added
Discussions of new technologies “Types of Finishes” added to the Chapter

28. Questions?