Correction to the November 2009 feature "Get into the Groove"

On page 13 of the November 2009 issue, Figure 2 of the article "Get into the Groove" had a few typos. The dimensions for a welded loop that are shown are 9" high by 4.5" wide. They should be 9' high by 4.5' wide. Also, growth and ASHRAE are misspelled. We apologize for the mistakes.