1. Fungal Ecology Definitions under ANSI/IICRC S520
The ANSI/IICRC S520 standard classifies indoor environments into three distinct ecological states to determine the necessary engineering controls:
| Ecology Classification | Biological Definition | Required Remediation Protocol |
|---|---|---|
| Condition 1 (Normal Ecology) | Normal indoor fungal ecology with spore counts matching outdoor background air. | Baseline state; target outcome for Post-Remediation Verification (PRV). |
| Condition 2 (Settled Spores) | Elevated settled spores or fungal fragments without active mycelial growth on surfaces. | HEPA vacuuming, damp wiping with botanical antimicrobials, and air scrubbing. |
| Condition 3 (Active Growth) | Active fungal colonization with hyphae digesting building materials. | Critical negative air containment (-5 Pa), demolition of porous substrates, HEPA filtration. |
2. The Core Principle: Physical Removal vs. Chemical Spraying
ANSI/IICRC S520 strictly prohibits relying on chemical biocides alone without physical removal of fungal biomass. Dead or non-viable fungal spores retain intact mycotoxins and beta-glucans, remaining potent biological allergens capable of triggering respiratory distress. Physical extraction of the organism is mandatory.
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