Diversitech 640-fd2b Black Flex Duct Tape 2in X 180ft

Product Description

The DIVERSITECH 640-fd2b is a black flexible duct tape designed for sealing joints on flexible ductwork. It measures 2 inches wide and provides 180 feet of tape per roll, giving HVAC technicians a substantial working supply for multi-connection jobs. The tape carries UL181B-FX listing, meaning it meets the UL standard for closure systems used on Class 1 flexible air ducts and connectors. Licensed HVAC contractors and sheet metal mechanics reach for this tape when a code-compliant, durable closure is required on flex duct systems in both new construction and retrofit work.

This tape is intended for use on flexible air ducts and flexible air connectors where UL181B-FX listed closure systems are required by code. Typical applications include sealing collars, boot connections, and duct-to-plenum joints in residential and light commercial HVAC systems. The black color is commonly specified for installations where the ductwork is exposed or where color coding by duct type or airstream is standard practice on the job.

Key Features

• UL181B-FX listed for use on Class 1 flexible air ducts and connectors
• 2-inch width suitable for covering joints and seams on standard flex duct collars
• 180-foot roll length reduces mid-job roll changes on larger installs
• Black finish for exposed duct applications or color-coded system identification
• Flexible backing conforms to the irregular surface contours of flex duct outer jackets

Compatibility

Designed as a UL181B-FX listed closure tape for use on Class 1 flexible air ducts and flexible air connectors in residential and light commercial HVAC duct systems.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with local mechanical codes and the duct manufacturer's listed closure instructions. Power down the air handling unit and relieve any system pressure before working on duct connections. Surface should be clean and dry before tape application to ensure full adhesion at the joint. UL181B-FX tape must be applied as part of a listed closure system — verify that the flex duct itself also carries the appropriate UL listing for the application.

Technical Specifications

• Width: 2 inches
• Length: 180 feet per roll
• Color: Black
• Listing: UL181B-FX
• Application: Flexible duct joints and connectors

Standard Information

• Brand: DIVERSITECH
• Manufacturer Part Number: 640-fd2b