On Thu, 28 Jan 2016 12:55:23 -0500, Nancy Young
> wrote:

>On 1/28/2016 10:32 AM, Dave Smith wrote:
>
>> move when the fan kicked in. The down side is that there seem to be a
>> lot of duct cleaning businesses that try to sell you their service more
>> often than it needs to be done, and some that claim that they did it for
>> you in the past and it is due again, even though you have never done
>> business with them.
>
>When the guy was leaving my house after doing the ducts, he
>said My company says it should be done every two years, while
>shaking his head No, you don't. I laughed and said Maybe not
>every two years but probably more than every 50 years. Right!
>
>nancy

We were in that house in the early 70s and I don't recall any
companies giving that service, but there may have been.