What is an effective method to fasten insulation to the inside of a duct?

Using tabs and adhesive is an effective method for fastening insulation to the inside of a duct because it provides a secure, long-lasting bond without compromising the duct's integrity. This method allows for a smooth installation process and helps to minimize air leaks, which can occur if a mechanical fastening method like screws is used. Adhesive ensures even pressure is applied across the insulation, preventing any gaps that could lead to thermal loss or diminished efficiency.

Additionally, using tabs and adhesive avoids the potential for damage that could arise from drilling holes in the ductwork, which might introduce weak points or lead to corrosion over time. While other methods like screws and bolts can be effective in certain applications, they also risk creating points of thermal bridging that can interfere with the insulation's performance. Therefore, tabs and adhesive are generally preferred for achieving a reliable seal and maintaining duct performance.