Make certain that the business has the correct devices and sufficient HEPA filtered vacuum power (2,000 CFMs or more), to appropriately clean your duct. Be tired of business that utilizes little vacuum systems that have a little turning brush on completion of a little vacuum hose with a normal air flow of 150 to 300 cfm or less. Appropriate duct cleaning vacuums are damaging air devices with 2,000 CFMs have 8 inches to 14 inches or bigger, vacuum hoses to record big amounts of dust and particles.
"This a very professional company that came the next day after being contacted late in the day prior. The two guys that came to the door that did the work were well dressed and very courteous. They cleaned my diver vent and it works perfectly. I have their literature and will be calling them when I m ready for duct cleaning. Nice equipment too! Thanks for the good work. Nice not to have scroungy guys showing up at the door. "