Fresh Air Ventilation Systems, LLC             Presents
Ventilation             for Healthy Homes              Hosted by Kurt T. Johnson  HRAI Certified Design and Installation...
Air is a transporter3 Main pollutants which air moves            Moisture             Gases            Particles
How does this affect our Health?        All of us breath constantlyEach day you take over 20,000 breaths and     breathe a...
How much fresh air is enough?France = 1 complete air change per hour (ACH)Sweden = ½ ACHASHRAE (American Society of Heatin...
Three Converging Trends• Construction• Chemicals & other pollutants• Couch Potatoes
Changes in ConstructionOld houses & buildings leaked a lot of air
1973 Oil Embargo Changed it
Note: As a result of the 1973 oil embargo, national energy conservationmeasures called for a reduction in the amount of ou...
The Apple & AtariArrive in the late 70’s
Trend number 2 Americans spend  89% of our time  indoors 6% traveling 5% outdoors  Klepeis, N.E., et al 2001
#3 Demand for Easy of Life                                                                 Global Production: Synthetic Or...
Pollution Sources                                                                                              Average Con...
What Happened in the 80s & 90s Sick Building Syndrome – 30% of new or  remodeled buildings have excessive  complaints - s...
More Bad News  Is Vinyl Flooring Causing Autism?  Scientists find "baffling" link between autism and the phthalates off-  ...
Asthma becomes Nation EpidemicAsthma cases triple                       Asthma Deaths also triple 1980 – 6.8 million     ...
Cleaning Chemical Studies European women using spray cleaners 4 days  a week were more than twice as likely to have  asth...
 Radon kills over 20,000 per year  in the US 1 in 15 Homes have high radon  levels at or above 4 (pCi/L) Cancer risk at...
Mold and other Particulates 60,000 deaths each year  caused by particulate matter  source American Heart Association Exp...
Does this concern you?       If so,..  What can we do?
2 Effective Strategies      Source Control & Ventilation Limit the pollutants from coming in Remove the ones that do get...
Ventilation  Natural vs. MechanicalWe need to start thinking about a      house as a system
2 Main Driving Forces of Air High Pressure to low pressure Warm air rises Cold air drops  (Stack effect)Very Important P...
Natural (wind & stack) & Mechanical
What can be trusted             to consistently work?    Natural Ventilation     Mechanical Ventilation   Wind is inconsi...
Mechanical Ventilation is Superior            but which one….         Exhaust only vs. BalancedWhich one is really effecti...
Very Important Questions?    What room do you spend the most time in?              And your children?“Bedtime is anything ...
Formaldehyde found in baby cribs• Many baby nursery furnishings emit formaldehyde.• A baby sleeping in a nursery furnished...
Does Exhaust only really work?• Bath and kitchen fans have been used for many years• Do they really ventilate the bedrooms...
Exhaust Ventilation Exhausts air in bathroom  and kitchen. No control of fresh air May not be used properly Depressuri...
Air Moves from High to Low Pressure Since air out is replaced by air coming back in….        So… Where does the air come i...
Designed and Balanced Ventilation• Ventilates all rooms• Controls air flow• Heat recovery up to 95%• Recovers bath heat lo...
Types of VentilatorsHRV (Heat Recovery Ventilators)   ERV (Energy Recovery Ventilator)• Heat recovery up to 95%         • ...
How Air Exchangers Work
A core with lots of surface area transfers heat      Pollutants and moisture are removed              and heat is recovered
Ventilation and FiltrationFor best quality airwhole house HEPA air exchanger• captures 99.97% of all dust and particleseve...
All of the data presented so far has been  from houses built based on the changes of      the late 70’s and 80’s. Not very...
What is a “tight” house?                     Pre 1987 = 8.6 ACH50                   Since 1992 = 5.2 ACH50                ...
Signs and Symptoms of Air Pollutioneffects are similar to those from colds or other viral diseases    Headaches          ...
With special thanks to the following     contributors & sources of informationDr. Richard CorsiProfessor, Department of Ci...
Fresh Air Ventilation Systems, LLC155 Spring St.Lewiston, ME 04240207 786-9400kurt@freshairventilation.netwww.freshairvent...
HHT Presentation: Ventilation
HHT Presentation: Ventilation
HHT Presentation: Ventilation
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Presentation by Kurt Johnson, Fresh Air Ventilation Systems, on the importance of home ventilation at the Maine Asthma Coalition's Healthy Homes Trainings

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HHT Presentation: Ventilation

  1. 1. Fresh Air Ventilation Systems, LLC Presents
  2. 2. Ventilation for Healthy Homes  Hosted by Kurt T. Johnson  HRAI Certified Design and Installation of Residential Mechanical Ventilation Systems Board Member of The Maine Indoor Air Quality Council
  3. 3. Air is a transporter3 Main pollutants which air moves Moisture Gases Particles
  4. 4. How does this affect our Health? All of us breath constantlyEach day you take over 20,000 breaths and breathe about 35 pounds of air. Some of “the passengers” hurt usHigher concentrations = Higher health threat
  5. 5. How much fresh air is enough?France = 1 complete air change per hour (ACH)Sweden = ½ ACHASHRAE (American Society of Heating Refrigeration andAir Conditioning Engineers) = 1/3 ACH DisclaimerASHRAE uses its best efforts to promulgate Standards and Guidelines forthe benefit of the public in light of available information and acceptedindustry practices. However, ASHRAE does not guarantee, certify, or assurethe safety or performance of any products, components, or systems tested,installed, or operated in accordance with ASHRAE’s Standards orGuidelines or that any tests conducted under its Standards or Guidelines willbe nonhazardous or free from risk.
  6. 6. Three Converging Trends• Construction• Chemicals & other pollutants• Couch Potatoes
  7. 7. Changes in ConstructionOld houses & buildings leaked a lot of air
  8. 8. 1973 Oil Embargo Changed it
  9. 9. Note: As a result of the 1973 oil embargo, national energy conservationmeasures called for a reduction in the amount of outdoor air provided forventilation from 15 to 5 cfm per person
  10. 10. The Apple & AtariArrive in the late 70’s
  11. 11. Trend number 2 Americans spend 89% of our time indoors 6% traveling 5% outdoors Klepeis, N.E., et al 2001
  12. 12. #3 Demand for Easy of Life Global Production: Synthetic Organic Chemicals Wall-to-wall carpet 350 300 Bi l l i on k g/year 250 Cleaners 200 150 100 50 Air fresheners 0 1920 1940 1960 1980 2000 Year Pesticides Personal care products Much more Dr. Richard Corsi, University of Texas
  13. 13. Pollution Sources Average Concentrations of VOCs 0.5 Concentration ( g/m3) 0.45 0.4 µ 0.35 0.3 Scented 0.25 0.2 Unscented 100 0.15 Acetone 0.1 90Average Transfer Efficiency (%) Ethyl Acetate 0.05 80 Toluene 0 70 Ethylbenzene e e ne e ne s) en en en Cyclohexane er ze ze lu nz yr m 60 en en To St so Be lb lb 50 ll i hy hy (a et Et s im 40 ne Tr le 4- Xy 30 2, 1, 20 10 0 Kitchen Sink Bathtub Washing Shower Dishwasher Machine
  14. 14. What Happened in the 80s & 90s Sick Building Syndrome – 30% of new or remodeled buildings have excessive complaints - source World Health Organization (WHO) 1984Centers for Disease Control and Prevention (CDC)% of all complaints relating to Indoor Air Quality 1978 = 0.5% 1990 = 52% Dramatic increase in Respiratory diseases
  15. 15. More Bad News Is Vinyl Flooring Causing Autism? Scientists find "baffling" link between autism and the phthalates off- gassed by vinyl flooring, and other indoor air contaminants.The International Agency for Research on Cancer and the World HealthOrganization have concluded that 80% of all cancers areattributed to environmental rather than genetic factors,including exposure to carcinogenic chemicals, many of which arefound in household cleaning products.
  16. 16. Asthma becomes Nation EpidemicAsthma cases triple Asthma Deaths also triple 1980 – 6.8 million  1977 – 1,674 1996 – 14.6 million  1998 – 5,438 1999 – 17.3 million 2005 – 22.2 million Leading killer of young children!!!!Costs 5.5 to 14.5% of family income to treat an asthmatic child Asthma increase a mystery April 9, 2002 - source: by Ben Lieberman / National Review online
  17. 17. Cleaning Chemical Studies European women using spray cleaners 4 days a week were more than twice as likely to have asthma Women working in domestic cleaning 46 - 109 % more likely to develop asthma Source National Jewish Health Feb 2009
  18. 18.  Radon kills over 20,000 per year in the US 1 in 15 Homes have high radon levels at or above 4 (pCi/L) Cancer risk at 4pCi/L = 1 in 44 In Maine, the average house is at or above 4 pCi/L. Source EPA
  19. 19. Mold and other Particulates 60,000 deaths each year caused by particulate matter source American Heart Association Exposure to air pollution contributes to the development of cardiovascular diseases (heart disease and stroke).
  20. 20. Does this concern you? If so,.. What can we do?
  21. 21. 2 Effective Strategies Source Control & Ventilation Limit the pollutants from coming in Remove the ones that do get in
  22. 22. Ventilation Natural vs. MechanicalWe need to start thinking about a house as a system
  23. 23. 2 Main Driving Forces of Air High Pressure to low pressure Warm air rises Cold air drops (Stack effect)Very Important Principle Air out is equal to air in
  24. 24. Natural (wind & stack) & Mechanical
  25. 25. What can be trusted to consistently work? Natural Ventilation Mechanical Ventilation Wind is inconsistent  Air flow Controllable Winter vs. Summer  Properly Designed will No Control vent every room 100% heat loss  Heat Recovery (with Air Exchanger) up to 95% Tight house has few of heat from exhaust air holes and where?
  26. 26. Mechanical Ventilation is Superior but which one…. Exhaust only vs. BalancedWhich one is really effective when it comes to complete ventilation of entire house?Does it remove the pollutants from all rooms?
  27. 27. Very Important Questions? What room do you spend the most time in? And your children?“Bedtime is anything but pleasant for people with allergies and asthma since that’s very often the time when symptoms worsen.” Source Amer. Lung Assoc.
  28. 28. Formaldehyde found in baby cribs• Many baby nursery furnishings emit formaldehyde.• A baby sleeping in a nursery furnished with a high-emission crib and changing table may face an increasedrisk of developing allergies and/or asthma.• Formaldehyde exposure can cause cancer in thelong term. “… 2 ppb (parts per billion)” • 6 tested furnishings released “enough formaldehyde to contaminate an entire home with levels of formaldehyde greater than this threshold. Environment California 2008This is just 1 of the many house componentsreleasing formaldehyde and other chemicals
  29. 29. Does Exhaust only really work?• Bath and kitchen fans have been used for many years• Do they really ventilate the bedrooms?• Are they effective ventilating every room? Let’s see….
  30. 30. Exhaust Ventilation Exhausts air in bathroom and kitchen. No control of fresh air May not be used properly Depressurizes building May cause back drafting May pull pollutants in from garage 100% heat loss Can be noisy
  31. 31. Air Moves from High to Low Pressure Since air out is replaced by air coming back in…. So… Where does the air come in?.... Front door Basement Garage Flue Other not in use ventsWhere does it go? . . . Right to the low pressure (bathroom, kitchen)Question? How does the bedroom get fresh air? We really don’t know…. Because every house is different.This method only hopes to ventilate the bedroom but thereis no direct control. This is really a “hope so” method.
  32. 32. Designed and Balanced Ventilation• Ventilates all rooms• Controls air flow• Heat recovery up to 95%• Recovers bath heat loss• In Winter, can controlhumidity• Programmable• Low elec. cost as low as $3per month (ECM motors)
  33. 33. Types of VentilatorsHRV (Heat Recovery Ventilators) ERV (Energy Recovery Ventilator)• Heat recovery up to 95% • Heat recovery up to 95%• Removes all moisture within • “Bounces” some moisture backexhaust air to its source• Good for colder climates with • Good from warm humid climatesexcess indoor humidity or dry houses •No condensation drain
  34. 34. How Air Exchangers Work
  35. 35. A core with lots of surface area transfers heat Pollutants and moisture are removed and heat is recovered
  36. 36. Ventilation and FiltrationFor best quality airwhole house HEPA air exchanger• captures 99.97% of all dust and particleseven those as small as 0.3 micron (150thof a human hair)• Removes moisture and gases Other filters available •Pleated •Charcoal •Electrostatic
  37. 37. All of the data presented so far has been from houses built based on the changes of the late 70’s and 80’s. Not very tight. What will be the consequences of the latest changes with the whole country going GREEN? Maine’s Uniform Building and Energy code Federal Tax Credits for Energy Efficiency$5 billion to weatherize more than 1 million homes Cash for Caulkers
  38. 38. What is a “tight” house? Pre 1987 = 8.6 ACH50 Since 1992 = 5.2 ACH50 2003-07 = 4.8 ACH50 (Calif. Study Houses) “Home Building Envelope Air Leakage Area. The median ACH50 (air changes per hour at 50 pascals) for the homes in this study was 4.8 air changes per hour, which compares to a median of 5.2 air changes per hour for a group of homes built since 1992 and 8.6 airchanges per hour for a group of homes built before 1987. New Californian homes are generally being built tighter, but not exceptionally tight, like those found in colder climate regions.” In Maine, If an energy auditor tests your home and it is at or above 3.5 ACH50 you will be told that you have plenty of natural ventilation and that you do not need any additional.
  39. 39. Signs and Symptoms of Air Pollutioneffects are similar to those from colds or other viral diseases  Headaches  Moisture on Windows  Congestion  Black mold around  Watery Eyes windows and low or high on walls  Coughing  High radon readings  Shortness of Breath  Poor Combustion  Dizziness  Flue Back Drafts  Lethargy  Chronic Stale Smell  Fever  Digestive Problems
  40. 40. With special thanks to the following contributors & sources of informationDr. Richard CorsiProfessor, Department of Civil, Architectural andEnvironmental EngineeringPresident of Indoor Air 2011http://www.esi.utexas.edu/outreach/ols/lectures/Corsi/U. S. Dept of Environmental Protection www.epa.gov/iaqCalifornia Air Resource Board www.arb.ca.govAmerican Lung Association www.lungusa.orgIndoor Environment Connections www.ieconnections.comWorld Health Organization www.who.intVenmar Ventilation www.venmar.ca
  41. 41. Fresh Air Ventilation Systems, LLC155 Spring St.Lewiston, ME 04240207 786-9400kurt@freshairventilation.netwww.freshairventilation.net All rights reserved
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