The corporate venturing unit of US-based industrial company 3M has backed US-based ventilation, air conditioning and heating company 7AC Technologies.

3M New Ventures invested an undisclosed sum in 7AC on July 20. A March filing with US regulator the Securities and Exchange Commission shows 7AC raised $2.4m of a planned $2.5m round. Last year 7AC raised $460,000, according to another filing.

7AC uses so-called “liquid desiccant technology” to remove humidity from the air, to heat and cool the…

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