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References

Technical references for the air conditioning duct guide

Every figure in the technical guide links to one of these references. Each one states whether it is primary or sector and what scope it has.

Limpieza de Ductos PanamáBy Limpieza de Ductos PanamáReviewed October 20, 20268 min readShare
Ducto metálico flexible de ventilación visto de cerca
Short answer

This page gathers the 45 references of the technical guide. A reference is primary when it comes from a public body or from peer-reviewed literature with no commercial interest in the result, and sector when it is a standard or a study from an industry association or consultancy. All DOIs were checked on October 20, 2026. Figures that circulate without a traceable primary document are not used in the guide.

Official positions, technical documents and standards

  1. D-01
    Operations & Maintenance Best Practices: A Guide to Achieving Operational Efficiency (Release 3.0)Sullivan, G. P., Melendez, A. P., Pugh, R. y Hunt, W. D. U.S. Department of Energy / PNNL, PNNL-19634, 2010.Open source PrimaryChapter 5, “Types of Maintenance Programs”.
  2. D-02
    Commissioning: A Highly Cost-Effective Building Energy Management StrategyMills, E. Lawrence Berkeley National Laboratory, 2009.Open source PrimaryDatabase of 643 U.S. buildings; 2009 dollars.
  3. D-03
    Standard Practice for Inspection and Maintenance of Commercial Building HVAC SystemsASHRAE y ACCA. Norma ANSI/ASHRAE/ACCA 180.Open source SectorUseful to justify inspection and maintenance frequency, not for savings figures.
  4. D-04
    Dirty air conditioners: Energy implications of coil foulingSiegel, J., Walker, I. y Sherman, M. Lawrence Berkeley National Laboratory (LBNL-49757), 2002.Open source PrimaryFocused on residential equipment.
  5. D-05
    What Can 13,000 Air Conditioners Tell Us?Downey, T. y Proctor, J. Proctor Engineering Group, 2002 (informe final en borrador).Open source SectorField database from the consultancy; not peer reviewed.
  6. D-06
    Associations of Cognitive Function Scores with Carbon Dioxide, Ventilation, and Volatile Organic Compound Exposures in Office WorkersAllen, J. G. et al. Environmental Health Perspectives 124(6):805-812, 2016 (estudio COGfx, Harvard T.H. Chan).DOI 10.1289/ehp.1510037 PrimaryA study of ventilation and pollutants, not of duct cleaning.
  7. D-07
    The Inside Story: A Guide to Indoor Air QualityU.S. Environmental Protection Agency, Office of Air and Radiation.Open source Primary
  8. D-08
    Energy Efficiency Indicators for Hotel BuildingsSustainability 13(4):1754, MDPI, 2021.DOI 10.3390/su13041754 PrimaryUsed qualitatively only: hotels in tropical climates tend to use more energy than those in temperate ones.
  9. E-02
    Should You Have the Air Ducts in Your Home Cleaned?U.S. Environmental Protection Agency, EPA 402-K-97-002; última actualización 19 de febrero de 2026.Open source PrimaryOfficial position on indications, biocides and sealants. Written for homes.
  10. E-31
    ACR, The NADCA Standard: Assessment, Cleaning and Restoration of HVAC SystemsNational Air Duct Cleaners Association (NADCA), edición 2025.Open source SectorAn industry standard: cited as a method, not as proof of benefit. Full text at acrstandard.nadca.com.
  11. D-09
    Building Air Quality: A Guide for Building Owners and Facility ManagersU.S. Environmental Protection Agency y NIOSH, EPA 402-F-91-102.Open source PrimaryGuide on building an indoor air quality profile and a management plan; it dates from 1991, so it is used for method and not for figures.
  12. D-10
    Thermal Guidelines for Data Processing EnvironmentsASHRAE Technical Committee 9.9. Tarjeta de referencia de la quinta edición (2021), Tabla 2.1.Open source SectorIndustry standard: defines temperature, dew point and humidity ranges for IT equipment.
  13. D-11
    Guidelines for Environmental Infection Control in Health-Care FacilitiesCenters for Disease Control and Prevention (CDC), 2003 (MMWR 52, RR-10).Open source PrimaryWritten for health-care facilities; in small practices it applies by analogy. Categories IB and IC are those assigned by the guideline itself.
  14. D-12
    La calidad del aire interior: el activo invisible que impulsa salud y productividadGrupo EULEN Panamá, comunicado de prensa del 28 de mayo de 2025.Open source SectorA press release from a services company: only its qualitative remark on ducts, diffusers and returns is cited, not its figures.

Reviews and occupant health

  1. E-01
    Is ventilation duct cleaning useful? A review of the scientific evidenceZuraimi, M. S. Indoor Air 20(6):445-457, 2010.DOI 10.1111/j.1600-0668.2010.00672.x PrimaryThe reference review on the topic.
  2. E-03
    Risk factors in heating, ventilating, and air-conditioning systems for occupant symptoms in US office buildings: the US EPA BASE studyMendell, M. J. et al. Indoor Air 18(4):301-316, 2008 (estudio BASE de la EPA, 97 edificios).DOI 10.1111/j.1600-0668.2008.00531.x Primary
  3. E-04
    Association of ventilation system type with SBS symptoms in office workersSeppänen, O. y Fisk, W. J. Indoor Air 12(2):98-112, 2002.DOI 10.1034/j.1600-0668.2002.01111.x Primary
  4. E-05
    Ventilation and health in non-industrial indoor environments: report from a European Multidisciplinary Scientific Consensus Meeting (EUROVEN)Wargocki, P. et al. Indoor Air 12(2):113-128, 2002 (consenso EUROVEN, 105 estudios).DOI 10.1034/j.1600-0668.2002.01145.x Primary
  5. E-06
    Prevalence of the sick building syndrome symptoms in office workers before and after being exposed to a building with an improved ventilation systemBourbeau, J. et al. Occupational and Environmental Medicine 53(3):204-210, 1996; seguimiento a 3 años en 54(1):49-53, 1997.DOI 10.1136/oem.53.3.204 Primary
  6. E-23
    Type of Ventilation System in Office Buildings and Sick Building SyndromeJaakkola, J. J. K. et al. American Journal of Epidemiology 141(8):755-765, 1995.DOI 10.1093/oxfordjournals.aje.a117498 Primary
  7. E-24
    Quantitative relationship of sick building syndrome symptoms with ventilation ratesFisk, W. J. et al. Indoor Air 19(2):159-165, 2009 (Lawrence Berkeley National Laboratory).DOI 10.1111/j.1600-0668.2008.00575.x Primary
  8. E-25
    Comprehensive Review on the Relationship between Duct Cleanliness and Airborne ContaminantsRosli, M. et al. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 115(2):61-69, 2024.DOI 10.37934/arfmts.115.2.6169 Primary
  9. E-30
    A comprehensive review of microbial contamination in the indoor environment: sources, sampling, health risks, and mitigation strategiesChawla, H. et al. Frontiers in Public Health, 2023.DOI 10.3389/fpubh.2023.1285393 Primary

Microbial contamination in HVAC systems

  1. E-10
    Distribution characteristics, growth, reproduction and transmission modes and control strategies for microbial contamination in HVAC systems: A literature reviewLiu, Z.-J. et al. Energy and Buildings 177:77-95, 2018.DOI 10.1016/j.enbuild.2018.07.050 Primary
  2. E-11
    Ventilation and air conditioning systems are a source of antibiotic-resistant bacteria: a reviewGorlach, J. et al. Building and Environment, 2025.DOI 10.1016/j.buildenv.2025.112583 Primary
  3. E-12
    Distribution and comparison of bacterial communities in HVAC systems of two university buildings: implications for indoor air quality and public healthSibanda, T. et al. Environmental Monitoring and Assessment 193(1), 2021.DOI 10.1007/s10661-020-08823-z Primary
  4. E-13
    Bacterial and fungal ecology on air conditioning cooling coils is influenced by climate and building factorsBakker, A. et al. Indoor Air 30(2), 2019 (40 equipos comerciales en clima cálido-húmedo y cálido-seco).DOI 10.1111/ina.12632 PrimaryThe most relevant reference for Panama.
  5. E-14
    A Method to Evaluate and Eliminate Fungal Contamination in Household Air ConditionersShiraishi, Y. et al. Indoor Air, 2023.DOI 10.1155/2023/8984619 PrimaryHousehold mini-split units (ductless) in 17 homes.
  6. E-15
    Fungal Load and Composition in Residential Air Conditioners Recontaminated 1 Year After CleaningShiraishi, Y. et al. Indoor Air, 2026 (estudio piloto, las mismas 17 viviendas).DOI 10.1155/ina/1402024 Primary
  7. E-16
    Airborne fungal and particle mitigation in HVAC systems: an evaluation trial in a coastal healthcare facilityPisaniello, D. et al. Journal of Hospital Infection, 2026.DOI 10.1016/j.jhin.2026.09.007 PrimaryOne healthcare facility in a coastal semitropical climate; a single case.
  8. E-22
    Dust accumulated fungi in air-conditioning system: findings based on field and laboratory experimentLiu, Z.-J. et al. Building Simulation 14:357-371, 2020.DOI 10.1007/s12273-020-0693-3 Primary
  9. E-27
    Microbial contamination in the indoor environment of Arabian Gulf: a reviewHaddad, G. y Al Hallak. Frontiers in Microbiology, 2026.DOI 10.3389/fmicb.2026.1796861 Primary
  10. E-28
    Moldy odor from air conditioners in the residences of Japanese participants with and without asthmaOkada, N. et al. Indoor Air 32(9), 2022 (1.006 adultos en Japón, 631 con asma).DOI 10.1111/ina.13156 Primary
  11. E-29
    Assessment of mold infestation of conditioning devices and indoor airKhaldeeva, E. et al. Hygiene and Sanitation 100(7):668-673, 2021 (40 locales residenciales y de oficina).DOI 10.47470/0016-9900-2021-100-7-668-673 Primary
  12. E-34
    Evaluation of bacterial and fungal load of different air conditioning systems in various operating conditions and quantitative microbial risk assessmentFouladi-Fard, R. et al. Journal of Aerosol Science, 2024.DOI 10.1016/j.jaerosci.2024.106455 Primary

Cleaning, dust and energy

  1. E-08
    Effectiveness of HVAC Duct Cleaning Procedures in Improving Indoor Air QualityAhmad, I. et al. Environmental Monitoring and Assessment 72(3):265-276, 2001.DOI 10.1023/a:1012045104566 PrimaryEight homes; compares contact vacuuming, air sweep and rotary brush.
  2. E-09
    Investigation of contact vacuuming for remediation of fungally contaminated duct materialsFoarde, K. K. et al. Environment International 23(6):751-762, 1997.DOI 10.1016/s0160-4120(97)00087-1 Primary
  3. E-17
    Particle loading rates for HVAC filters, heat exchangers, and ductsWaring, M. S. y Siegel, J. A. Indoor Air 18(3):209-224, 2008.DOI 10.1111/j.1600-0668.2008.00518.x PrimaryA modeling study: the figures are estimates, not field measurements.
  4. E-18
    Full-Scale Laboratory Test on Energy Dependence on Pressure Drops in HVAC SystemsZhai, Z. et al. Procedia Engineering 205:2535-2541, 2017 (University of Colorado Boulder).DOI 10.1016/j.proeng.2017.10.138 Primary
  5. E-26
    HVAC Duct Contamination and Its Impact on Energy Efficiency and Indoor Air Quality: Evaluation and Ranking of Inspection MethodsMashonova, K. et al. Engineering Proceedings (TechSys 2026).DOI 10.3390/engproc2026150044 Primary
  6. E-33
    Assessing the impact of particulate fouling on the long-term performance of energy recovery ventilatorsSun, X. et al. Applied Thermal Engineering, 2023.DOI 10.1016/j.applthermaleng.2023.121990 Primary

Climate and context

  1. C-04
    Nueva ley actualiza reglas de convivencia en los PHLa Prensa (Panamá).Open source SectorPress source on Law 284 of February 14, 2022 (horizontal property). For contractual obligations, the text of the law and legal advice should be consulted.
  2. C-01
    Caracterización climática para los distritos de Panamá y San MiguelitoETESA, Gerencia de Hidrometeorología, Centro del Clima de Panamá. Estación Tocumen, promedios de 1977 a 2010.Open source Primary
  3. C-02
    A Brief Guide to Mold, Moisture and Your HomeU.S. Environmental Protection Agency; actualizada el 18 de febrero de 2026.Open source Primary
  4. C-03
    WHO guidelines for indoor air quality: dampness and mould (resumen ejecutivo)Organización Mundial de la Salud, 2009.Open source Primary

Selection criteria

  • Public bodies, national laboratories and peer-reviewed studies are preferred.
  • Standards and studies from industry associations or consultancies are labeled as sector.
  • A figure is published only if the document where it appears can be linked; otherwise it is discarded.
  • Simulation or modeling studies are presented as limited evidence.
  • Data from the United States and other countries are presented as such and are not attributed to Panama.

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Keep reading the guide

Duct technical guideThe starting point: thesis, evidence grades and reading path.Open →Scientific evidence on duct cleaningWhat was measured when cleaning, what is not proven and which figures should not be promised.Open →When to clean ducts and how it should be doneIndication criteria, inspection methods and method requirements.Open →Indoor air quality and tropical climate in ductsPanama’s humidity, microbial contamination and recontamination.Open →Preventive maintenance and energy efficiencyDocumented data on maintenance, coils, charge and energy.Open →
Related toolDuct inspection plannerEstimate the level of attention your system needs based on use and warning signs.Open planner →
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