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The Clean Air Standard

An annual technical briefing on indoor air quality in North Texas: filtration science, UV-C germicidal irradiation, moisture and microbial control, and the 2025 NADCA standard, presented with the field data behind our work.

When: Next session date coming soon. Register and we’ll send it to you first.
Format: 90 minutes, live, with Q&A

Agenda

What we’ll cover

  1. Indoor air quality fundamentals

    PM2.5, bioaerosols and VOCs; why indoor concentrations of some pollutants run 2–5× outdoor levels (EPA).

  2. ACR 2025 in practice

    Source removal under negative pressure, HEPA-filtered containment, and cleanliness verification with the Surface Comparison Test and NADCA Vacuum Test.

  3. Filtration science

    ASHRAE 52.2 MERV efficiency bands, EPA’s MERV 13 guidance, static pressure, fan run-time and what the clinical studies show for allergic rhinitis and asthma.

  4. UV-C at the coil

    Germicidal dose, lamp placement and ozone-free lamps; ASHRAE field results on heat transfer and airflow in hot-humid climates.

  5. Moisture, mold and dust mites

    The 35–50% relative humidity target, condensate management, and reading the signs of coil biofilm.

  6. The North Texas exposure profile

    Ozone nonattainment, the DFW pollen calendar, attic heat and climate zone 3 insulation.

  7. Duct cleaning: evidence and ethics

    What EPA and peer-reviewed reviews support, what they don’t, and how to explain it honestly to a homeowner.

  8. Open Q&A

    Bring photos and questions. Homeowners, property managers, realtors and HVAC technicians welcome.

Preview: how a central air system works, animated

Save your seat

We’ll email you the date and the link. No spam.

From the research we’ll present

A preview of the science

~90%

of our time is spent indoors, where some pollutants run 2–5× higher than outdoors.

U.S. EPA
25.7%

of U.S. adults have a diagnosed seasonal allergy.

CDC National Center for Health Statistics
MERV 13

is the minimum filter rating EPA recommends for central systems, where the system can accommodate it.

U.S. EPA
35–50%

relative humidity is the allergist-recommended range to limit dust mite growth.

AAAAI/ACAAI Practice Parameter: Dust Mite Exposure Control (2013)
Sizes of common indoor particlesLog-scale chart from 0.01 to 100 micrometers. Pollen 10–100, dust mite allergen 10–40, mold spores 2–20, airborne pet dander 0.5–10, bacteria 0.3–10, smoke 0.01–1, viruses 0.02–0.3 micrometers. ASHRAE test bands E1 0.3–1, E2 1–3, E3 3–10 micrometers. E1E2E3 ASHRAE 52.2 test ranges PollenDust mite allergenMold sporesPet dander (airborne)BacteriaSmokeViruses 0.01 µm0.1 µm1 µm10 µm100 µm HEPA test size 0.3 µm
Particle sizes shown as typical ranges. Larger particles settle quickly into bedding and carpet; smaller ones stay airborne for hours, which is where filtration helps most. Sources: EPA, AAAAI.

Read the full Air Quality Science summary

Who it’s for

Homeowners who want to know what good work looks like. Property managers and realtors who order it. HVAC and cleaning technicians who want to raise their own bar. Bring your questions and your photos.

Why we host it

Clean Air Experts wants to be the beginning of a new standard for the HVAC and air quality industry in DFW, built on information, experience and professionalism. Sharing our research openly is part of that.