Among Mestek Machinery's most respected brands, Iowa Precision stands out for its reliability and advanced technology in ductwork fabrication. The brand is committed to delivering innovative manufacturing systems that boost productivity, efficiency, and quality in HVAC duct production.
The Iowa Precision Cornermatic® series represents the highest level of innovation in the HVAC industry. These machines are specifically designed to automate the insertion and crimping of corners into ductwork, minimizing manual labor and increasing shop efficiency. Their precision engineering ensures faster, safer, and more consistent results in sheet metal shops.
Understanding the Cornermatic Series
The Cornermatic line includes several models such as the Whisper-Loc PRO-XVI Seam Closing Machine, Cornermatic Plus, Cornermatic Combo, and Cornermatic Plus Versa. Each machine is built to improve efficiency, accuracy, and safety in duct fabrication. By combining seam closing and corner insertion tasks, these machines reduce handling, streamline workflows, and enhance overall productivity. Each model offers unique features tailored to different types of ductwork, from quiet operation to versatility across various sizes and styles.
Whisper-Loc PRO-XVI Seam Closing Machine
The Iowa Precision Whisper-Loc PRO-XVI Seam Closing Machine is equipped with push-button motor controls for quick changes in duct length and uses a chain drive system. It efficiently closes Pittsburgh seams—whether TDC, TDF, or slip and drive—significantly reducing the time required for this process. This machine is ideal for high-volume production environments where speed and consistency are essential.

Cornermatic Plus
The Cornermatic Plus is designed to simplify the challenging task of inserting corners into complex duct fittings. It can handle TDC and TDF fittings on a bench and automatically insert and crimp corners in seconds. This machine allows for the completion of eight corners in just 20 seconds, regardless of the metal gauge (16 through 26). It’s a game-changer for shops looking to increase output while maintaining quality.

Cornermatic Combo
The Cornermatic II Whisper-Loc Combo is a versatile machine that inserts and crimps corners on both ends of a duct while also closing longitudinal Pittsburgh seams when needed. This integrated design eliminates the need to move the duct between processes, saving time and reducing potential errors. It’s an excellent choice for shops looking to optimize their workflow and reduce production time.

Cornermatic Plus Versa
The Cornermatic Plus Versa is the most flexible unit in the Cornermatic family, offering the option to be placed either on the workshop floor or in-ground. Its heavy-duty hydraulic scissor lift allows for easy height adjustment with the press of a button, making it ideal for large ducts, heavy gauges, and complex fitting projects. This adaptability makes it a valuable tool for a wide range of HVAC applications.

Key Features and Benefits of Cornermatic Machines
1. Automation and Efficiency: These machines automate the labor-intensive task of corner insertion, significantly speeding up production and reducing labor costs.
2. Precision and Consistency: Advanced technology ensures each corner is inserted and crimped accurately, leading to high-quality, uniform ductwork.
3. Versatility: Designed to handle multiple duct styles and sizes, these machines offer flexibility for a wide range of projects.
4. Ease of Use: Intuitive controls make operation simple, even for less experienced workers, reducing training time and downtime.
5. Durability and Reliability: Built to last, these machines require minimal maintenance and deliver long-term performance.
6. Safety: Enhanced safety features protect operators, ensuring a secure working environment.
Iowa Precision's Cornermatic series is a powerful solution for any HVAC duct manufacturer aiming to improve efficiency, quality, and safety. By automating critical processes, these machines not only save time and money but also help businesses stay competitive in a fast-evolving industry. Investing in Cornermatic technology is a smart step toward modernizing your workshop and boosting productivity.
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