Research Project Information

Research Project Summary Information

Development of a non-intrusive duct sealing/renovation technology(16711)

Steven Winter Associates, Inc.


Steve Winters Associates (SWA) has been working on the development of a non-intrusive duct sealing/renovation technology that has no limitations like those of Aeroseal technology. It involves a process similar to angioplasty (stent placement), which is commonly applied to coronary arteries with considerable success. The significance of the proposed technology is that it not only seals leaks in ducts but forms a new duct inside an old, deteriorating duct, thus increasing the life of the duct significantly. SWA has identified a unique opportunity to develop a new class of ductwork retrofits that consist of snaking/threading deflated “balloons” (long, flexible bicycle-inner tube-like membranes) throughout duct system trunks and branches under the surveillance of a video system. These membranes or liners impregnated with a resin are then inflated until their exterior surface touches and adheres to duct walls, whereupon air is released and the liner stays in place.

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Project Description

The NYSERDA funded Phase I project has established the technical feasibility of the duct-lining concept. There remain several challenges to advance the current state-of-the-art. For example, the equipment used in the present experiments was designed for underground trenchless pipe rehabilitation. It is bulky and heavy for the duct-lining application. It is not easy to transport and cannot be routed through the ductwork easily in the field. In addition, materials have to be optimized. A significant undertaking to design and develop advanced, light-weight equipment is essential for this technology to be realized in the market place. The team believes that the proposed project to advance the technology and demonstrate it in the field is essential for bringing it to market.


•Interesting technology, with proven concept established in Phase 1 •Material could become the duct work as a cost-efficient replacement •Two (2) demo houses in NY State identified, with letters of support •Genre of houses is relevant to technology •Manufacturer’s license of technology to be granted to NY State company

Project Results


Steven Winter Associates, Inc.
61 Washington St
Norwalk, CT 06854

Principle Investigator

Ravi Gorthala

Universities Involved


Project Type:

Product Development

Technologies Types:

Building Systems
Heating, Ventilation, & Air Conditioning

NYSERDA Contact Information

Gregory Pedrick


R&D -Transport & Power Systems

Contract Details

Start Date: 6/30/2010
Project Status: Active
Contract Number: 16711

Last Updated: 3/22/2013