3M Company 2120W-6 Interior Window Insulator Kit

Product Description

The 3M COMPANY 2120W-6 is a double-pack interior window insulator kit designed to reduce drafts and improve thermal retention around residential windows. Each kit includes two sheets of clear film measuring 62 inches x 84 inches and one roll of mounting tape measuring 0.5 inches wide by 12 yards long. The film installs on the interior side of window frames to create an insulating air barrier, helping to maintain indoor comfort during cold weather. Licensed HVAC technicians and weatherization contractors install this product as part of building envelope work, and it is also suited for knowledgeable DIYers performing seasonal energy-saving upgrades.

This kit is intended for interior residential window applications where air infiltration is a concern. Each double pack covers two windows up to approximately 3 feet by 5 feet in size. The clear film is designed to remain visually transparent after installation, allowing natural light transmission without obstructing the view. It is commonly applied in single-family homes, apartments, and light commercial spaces where supplemental window insulation is needed during heating season. The 2120W-6 SKU is packaged in a case quantity of six kits, making it practical for contractors servicing multiple units or properties.

Key Features

• Each kit includes two film sheets at 62 inches x 84 inches, covering two standard windows per pack
• Includes 0.5-inch-wide mounting tape, 12 yards per kit
• Clear film maintains visible light transmission after installation
• Interior-mount design seals against cold-weather draft infiltration
• Case pack of six kits for multi-unit service applications

Compatibility

Designed for interior installation on standard residential windows up to approximately 3 feet by 5 feet. Suitable for single-hung, double-hung, and fixed windows where the interior frame surface accepts the included mounting tape.

Installation Notes

This product is installed by weatherization contractors, HVAC technicians, or qualified DIYers as part of building envelope air-sealing work. Clean and dry the window frame surface thoroughly before applying the mounting tape to ensure proper adhesion. The film is typically heat-shrunk using a hair dryer after taping to remove wrinkles and create a taut, transparent barrier. Follow all applicable building energy codes for your jurisdiction when performing weatherization work.