Plenums Plus has been engaged in sheet metal fabrication since 1986. Since that time, we have grown from a 5,000 sq. ft. shop laying out each part by hand; to a 40,000 sq. ft. fully automated shop employing as many as 100 artisans. We manufacture Round, Rectangular and Flat Oval Ductwork, in a variety of gauges and materials. Our capabilities include the ability to download ductwork from contractor supplied CAD files directly to our CNC plasma cutting system, saving time and minimizing the opportunity for errors. Most notably, in 1999 we were the first firm on the west coast, and the only firm in San Diego, to successfully navigate the verification process for our shop standards by SMACNA’s Testing and Research Institute. The significance of this is to show our understanding and commitment to our industry’s most comprehensive rectangular duct construction standards, as well as to give our clients peace of mind that they are getting a performance tested product. Our fleet of trucks and trailers deliver our products throughout Southern California. While outside freight companies handle products going to projects from La Paz Mexico to Northern California and out to Arizona and Nevada. As part of our commitment to sustainability, each year we divert more than 85% of our waste from disposal. Recycling is truly part of our company culture. For more information about our company, please visit
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