Using fiber is not simply about the "annoying" factor of RCF (Refractory Ceramic Fiber).... it is classified as a suspect human carcinogen (USA) or human carcinogen (EU) .... man-made asbestos, if you will.
I cringe watching that guy leaning down with his breathing zone into that brick enclosure with the dry fiber with no mask on. (A little knowledge is a dangerous thing. We are back to "VET your souces!" ) Make sure you are using a HEPA (or P-100) filter resprator ... and that it FITS (to legal standards).
Here's a quote from the US CDC:
"With increasing production of RCFs, concerns about exposures to airborne fibers prompted animal inhalation studies that have indicated an increased incidence of mesotheliomas in hamsters and lung cancer in rats following exposure to RCFs. Studies of workers who manufacture RCFs have shown a positive association between increased exposure to RCFs and the development of pleural plaques, skin and eye irritation, and respiratory symptoms and conditions (including dyspnea, wheezing, and chronic cough). In addition, current and former RCF production workers have shown decrements in pulmonary function."
Here's a quote from the European regulatory agency that is similar to the NIH / OSHA:
"3 The main concerns are in relation to potentially serious long-term health effects; experiments in animals have shown that RCFs can produce lung fibrosis, lung cancer, and also mesothelioma (a rare tumour of the lining of the chest cavity usually only associated with exposure to asbestos) following long-term inhalation."
Also see here:
As a pro kiln builder I ONLY work with it totallty wet. And only use it when there are few other decent design options. (A single wetting of fiber blanket is OK). But that is tough to work with wet..... hard to not rip the blanket and it gets heavy.
Professor of Ceramics; New Hampshire Insitute of Art
Guest Professor, Wuxi Institute of Arts and Science, Yixing, China
Former President and Past President; Potters Council