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Why it's important to clean ductwork in commercial facilities, especially healthcare occupancies, and industrial. Also when it is important to perform the cleaning.
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About• Specializes in Large Commercial HVAC Systems Cleaning Projects• Hospitals • Schools (K-12, Colleges)• Office Buildings• Industrial
• Services the Midwest and Southeastern United States
• Certified Member of National Air Duct Cleaners Association (NADCA), Indoor Air Quality Association, NFPA
Hughes Environmental
Why you should spec• Cost effective• Viable alternative to replacing ductwork• Lessen maintenance costs• Improve efficiency
• Indoor Air Quality• Reduce likelihood of hospital acquired infections• Improve indoor air quality in schools and buildings for
those with respiratory problems and allergies
duct cleaning
• Cleaning HVAC Systems is more cost effective than replacing ductwork, terminal boxes, air handler units• Outlook for states is not good for upcoming fiscal years• Less money to work with – more viable options for the government to clean HVAC Systems
Why you should specduct cleaning
CLEANING HVAC SYSTEMS COULD IMPROVE EFFICIENCY
ASHRAE STUDY ON BENEFITS OF CLEANING Restoration of the one air handler resulted in improvements that will lead to energy savings of up to
$40,000 this year, in accordance with the results and assumptions of this study. Restoring the air handler resulted in a decrease in the pressure drop across the coil, of approximately
14%. This has resulted in a corresponding increase in airflow. The result is that the fan is producing that much more work in the form of cooling.
Restoring the air handler increased the thermal efficiency of the cooling coil 25% with respect to its ability to transfer its energy to its sensible loads.
Restoring the air handler increased the thermal efficiency of the cooling coil 25% with respect to its ability to transfer its energy to its sensible loads.
Source: American Society of Heating, Refrigerating and Air-Conditioning Engineering, Inc. (ASHRAE), Ross D. Montgomery, P.E. and Robert Baker. Study Verifies Coil Cleaning Saves Energy. ASHRAE Journal (November 2006).
Why you should specduct cleaning
Clean coils, heat exchangers and heating coils add an average of 10% to system performance.
National Comfort Institute
A build up of 0.42" of dirt on a heating or cooling coil can result in a decrease of efficiency of 21%. EPA
• Improves indoor air quality for allergy and asthma suffers.– Johns Hopkins University Study found
• “Substantial increase in asthma symptoms were associated both with higher indoor concentrations of fine particles.”
• “4 percent increase in days on which rescue medication was needed.”• “Improving indoor air quality and lowering indoor particulate matter
concentrations may provide additional means of improving asthma health, especially for children”
Source: Johns Hopkins University Bloomberg School of Public Health (2009, February 27). Indoor Air Pollution Increases Asthma Symptoms, Study Suggests. Science Daily.
Why you should specduct cleaning
Dirt/Dust
Found in virtually all ventilation systems. Primary causes are poor filtration, duct leakage and overall lack of preventative
maintenance.
This type of contaminant is the most common food sourcefueling microbial growth
• Hospital Acquired Infections (HAI) are transmitted in through three main environmental routes: AIR, SURFACE CONTACT, and WATER.
• HAIs kill more Americans than AIDS, breast cancer or automobile accidents
“Airborne infections are spread when dust and pathogens are released during construction and renovation activities and contamination and malfunction of the hospital ventilation system”
Source: The Center for Health Design, “Impact of the Environment on Infections in Healthcare Facilities”
Why you should specduct cleaning
How are airborne infections transmitted?One way is when fungal spores (e.g. Aspergillus) are released into the air and make their way into the hospital environment
• Aspergillus is commonly found on construction debris
• Aspergillus can cause Aspergillosis in people with weakened immune systems
Why you should specduct cleaning
The Center for Disease Control (CDC) warns that construction raises the risk of aspergillosis
Case Study Akron Children’s Hospital: 5 Deaths attributed to aspergillosis. The investigation found that while infection control measures were taken during the construction project the air handler systems were the common link between all 5 deaths. The head of infection control was quoted “We forgot about the air handler Systems at the hospital”
Why you should specduct cleaning
According to The Center for Health Design
“The importance of good air quality in controlling and preventing airborne infections in healthcare facilities cannot be overemphasized. Providing clean filtered air and effectively controlling indoor air pollution through ventilation are two key aspects of maintaining good air quality.”
Why you should specduct cleaning
RETURN DUCTWORK
SUPPLY DUCTWORKSUPPLY DUCTWORK
RETURN DUCTWORK
How dirty does new ductwork get?
What should new ductwork look like
prior to being turned over to the owner?
BEFORE AFTER
LIKE NEW
Cleaningnew ductwork
BEFORE AFTER
All Buildings need a clean HVAC System• All Buildings have individuals with asthma/allergies• All Buildings need HVAC Systems to run more efficiently
Schools – Hospitals – Office Buildings – Industrial Plants
What type of building occupanciesshould have the HVAC system cleaned?
New and Existing• Unlined Supply, Return, Exhaust Ductwork• Lined Supply, Return Ductwork• Air Handler Units and all components • Terminal Boxes• Fan Coil Units / Unit Ventilators• Return and Exhaust Grilles and Supply Diffusers• Exhaust Fans and Dedicated Exhaust
What can be cleaned?
• Construction debris in ducts• LEED Prerequisite EQ1 "Ventilation System Start-Up" requires that distribution systems be clean of dirt and debris*• Can affect air balance/testing• IAQ especially critical in hospitals & schools
Why cleannew construction?
*LEED Prerequisite EQ1 requires compliance with ASHRAE 62.1-2004, Section 7.2.4
What can be cleaned?
BEFORE AFTER
AHUs and other HVAC componentsBEFORE AFTER
Lined or insulated ductwork
What can be cleaned?
Insulated ductwork sealed with Fiberlock IAQ 8500
BEFORE AFTER
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