What type of sampling determines fungal growth inside ductwork?

When determining fungal growth inside ductwork, surface sampling is the most effective method because it allows for the collection of samples directly from the surfaces where mold may be growing. This type of sampling captures the specific fungi residing on surfaces, which is crucial in duct systems where mold growth can develop on walls, insulations, and other components due to moisture accumulation and lack of proper ventilation.

This method involves using sticky tape or similar tools to collect samples, which can then be analyzed to identify the type and concentration of mold present. It provides a direct indication of mold contamination levels and helps assess the potential risk to indoor air quality.

Although other sampling methods like air sampling can provide insight into the types of mold spores present in the air within the ductwork, they do not give a direct indication of growth on the surfaces themselves. Bulk sampling involves collecting larger samples of material that might harbor mold, and swab sampling involves using a swab to gather material from a surface. While these methods have their own applications, they are not as applicable for evaluating specific fungal growth directly inside ductwork as surface sampling is.