Patent ID: 7062830

Claim:
In a forced air HVAC system having a network of air ducts connecting a central discharge plenum to a plurality of air vents, a method for installing an air tube from said plenum to at least one of said air vents, comprising: 1) connecting a blower to said plenum; 2) providing a flexible and expandable air flow restricting device adapted for passing through said air ducts and substantially restricting airflow at any location in said air ducts; 3) providing a string connecting to said restricting device, said string sufficiently long to connect from said air ducts to said plenum, and sufficiently flexible to easily follow a path through said air ducts, and sufficiently strong so as not to break when used to pull an air tube through said air ducts; 4) blocking all of the air vents but one air vent; 5) inserting said restricting device into said one air vent; 6) running said blower such that air flows at a rate sufficiently fast to pull said restricting device and said string from said one air vent to said plenum; 7) providing tension on said string while letting out said string such that said restricting device moves through said air ducts at a practical and reasonable speed until said restricting device reaches said plenum; 8) stopping said blower when said restricting device arrives at said plenum; 9) connecting said air tube to said string at said one of air vents; 10) accessing said string at said plenum; and 11) pulling said string at said plenum such that said air tube is pulled from said one of air vents through said air ducts to said plenum; whereby said air tube is installed from said one of air vents to side plenum by accessing said air ducts only at said one of air vents and at said plenum.