Quality Sheet Metal Fabrication

Based in Southern California and serving the West Coast, with a commitment to the industry’s most comprehensive duct construction standards.


Performance-tested products with an unparalleled

understanding of duct construction standards.

Round Ductwork

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Flat Oval Ductwork

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Rectangular Ductwork

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Spiral Pipe

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About Plenums Plus

In the early 80s Bob Copp, our Founder, had the idea to start a sheet metal shop to service HVAC contractors in the San Diego area. The idea was to keep people working consistently while also lessening the burden of a shop overhead for HVAC Contractors. In July of 1986, Bob and his wife Anne made this dream a reality.

Since this time, Plenums+ has expanded from a 5,000 sq. ft. shop to over 40,000 sq. ft. and manufactures Round, Rectangular, and Flat Oval Ductwork in a variety of gauges and materials.

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.


or more of our waste from disposal is diverted each year - We’re committed to sustainability & have made recycling an integral part of our operations.

years in the metal fabrication industry has given us an unparalleled understanding of and commitment to standards and quality.

sq. ft., fully automated metal shop. Since our begininngs in 1986 in a 5,000 sq. ft. shop, we have been dedicated to growth in our shop, our employees, our process, and more.

skilled artisans work hard to create superior quality product every day in our shop. We pride ourselves on incredible customer service.

Superior service, every step of the way.

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.

We’re committed to making sure our products arrive on time because your project is as important to us as it is to you.

With 30+ years experience in sheet metal fabrication…

We know a thing or two about great service.

Meet the team that brings incredible service to our partners each and every day.