Inline duct enthusiast manufactured from a thermoplastic resin. UL listed for outside use or in moist locations. Pace controllable. Installs in any orientation. Generally employed for kitchen area exhaust units. When hooked up to an inline or remote lover, the LD silencer substantially minimizes the seem touring throughout the duct. https://a-listdirectory.com/listings12821601/not-known-factual-statements-about-air-duct-cleaning