Our Company

In 2015, GreenSeam pipe and fittings products branched off as a new division of DMI Companies called GreenSeam Industries (GSI). GSI is a manufacturer of commercial Pipe and Fittings for the HVAC market. GSI’s mission is to be the market leader in product consistency, service, and innovation for low pressure duct systems. The organization has been supplying these products to markets from Maine to Florida and as far west as Kansas since 1998. The company has grown year over year by partnering with DMI’s distribution partners throughout the markets which it serves.

Manufacturing Excellence

GSI has continually improved its revolutionary product line over the past 12 years.  Tight product tolerances and exceptional manufacturing consistency is critically important when manufacturing GSI’s products.  Loose tolerances or inconsistent product will result in problems during assembly and inconsistent performance.  The consistency of GSI’s products and extremely tight manufacturing specifications are far beyond other manufacturers in our industry.


Our products are Union Made in the USA at our manufacturing facility in Western Pennsylvania, with additional warehouses and manufacturing in Tulsa, OK and Lodi, CA. Having multiple warehouses allows us to efficiently supply our products to our nationwide distribution network. Our Sales and Technical Support staff are housed at our corporate office in Charleroi, PA, 7 miles from away from our manufacturing facility.

Sales Offices

Charleroi, PA

210 Fifth Street

Charleroi, PA 15022

t: (866) 285 5222

f: (724) 258 5494

e: contact@greenseamind.com

Manufacturing and Warehousing

Monongahela, PA
1502 Industrial Drive
E. Monongahela, PA 15063

Wagoner, OK
300 SE 15th Street
Wagoner, OK 74467