- UL181 Standard for Factory-Made Air Duct and Air Connectors.
- ASTM G21 Standard Practices for Determining Resistance of Synthetic Polymeric Materials to Fungi, and ASTM G22 Standard Practice for Determining Resistance of Plastics to Bacteria.
- Fungal Contamination of HVAC Surfaces: The Role of the Dew Point in Microbial Amplification, Jerry J. Tulis, and Wayne R. Thomann; Occupational and Environmental Medicine Division, Duke University Medical Center, Durham, N.C.,1997.