Usage History of 'ductworks'

The following chart shows how frequently 'ductworks' appeared in printed materials over time. For example, the word 'ductworks' occurred 2 times in books in 1970 and 8 times in 2008. From 1970 to 2008, the word 'ductworks' was used a total of 237 times in books scanned by Google. See Reference: Google Ngram project.

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