AN UNBIASED VIEW OF AIR DUCT CLEANING

Has the service company sufficiently shown that duct operate and plenums are clean up? (Plenum is a space where supply or return air is mixed or moves; may be duct, joist Area, attic and crawl spaces, or wall cavity.)Your technician mustn't spray any chemical cleaning products in the ducts without your prior approval.When they completed the A/C and