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This Bill Gates-backed startup fixes leaking ductwork with 'chewing gum' material: 'Most people should be able to save … $500 to $600 per home'Enter: Aeroseal, a Bill Gates-backed startup that sprays a mist of its proprietary sealant — made with a material similar ... and $3,200 for a full-house ductwork resealing, and the company ...
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