The equipment will guarantee you no dangerous particles is breathed in. Considering that nobody knows what elements have been used or how outdated the ducts are, the last thing any one really wants to breathe in is asbestos, and an authorized N95 respirator will shield you. Info on the web https://connerygmtz.win-blog.com/11153711/not-known-factual-statements-about-duct-cleaning-virginia-beach