If a person or a person in the residence could have asthma or is acutely allergic to specific airborne supplies or pollen, frequent duct cleaning may well be helpful. The Environmental Protection Agency may not have an official position on the necessity of air duct cleaning unless the ducts have http://expresshvaccontractorinno61368.fitnell.com/41371305/everything-about-air-duct-cleaning-woodland-hills