While most study information indicate that PTFEs & PFOAs offgas at temperatures above 500 degrees Fahrenheit, there is information that some formulations will offgas between 360 degrees and 450 degrees Fahrenheit. Now whether that offgassing occurs in formulas used to manufacture teflon tape (used to wrap plumbing fittings in household water fixtures & gas fittings) or in bearings & bearing seats (often used in small blower/ventilation fans), the reporting information does not say. Box fans, ceiling fans & similar type cooling fans will have metal bearings and/or bushings in them, but smaller fans that are not heavy duty could use less expensive plastic bearing surfaces. The only way to get a better picture is to either write the product's manufacturer & ask them, but instead of asking if their product contains teflon, you need to ask if any surfaces that would be subject to temperatures of 300 degrees Fahrenheit or higher are manufactured with or from PTFEs or PFOAs. Teflon is a DuPont brand name & there are other products using the same or similar formulas under different names, so if a product that produces the same offgassing toxicity, but is not named teflon, you could get an honest/legal reply of NO. Also, by asking the question in writing and wording it properly, their reply could hold them liable for damages if you purchased their product under false assumptions. Phone calls & any answers from customer service personnel are really a waste of time, because you'll either get an answer that doesn't relate to your specific question or get an answer that they do not have that information at their disposal.
