Seal-tite 1210-1812 Duct Heat End Cap 18x12

Product Description

The SEAL-TITE 1210-1812 is a duct heat end cap sized at 18 by 12 inches, designed to terminate rectangular duct runs in forced-air HVAC systems. End caps close off the open end of a duct section, preventing conditioned air from bypassing the intended distribution path. This component is a standard part of sheet metal ductwork assemblies and is installed by HVAC technicians during new construction, duct modification, or system retrofits. Proper termination at duct ends maintains system static pressure and overall distribution efficiency.

This end cap fits rectangular duct measuring 18 by 12 inches and is suited for residential and light commercial forced-air heating and cooling applications. It is typically installed at a dead-end duct run, at a plenum takeoff that is being capped off, or during duct reconfiguration where an outlet is no longer needed. HVAC sheet metal installers and service technicians are the primary trades working with this component.

Key Features

• Fits 18 by 12 inch rectangular duct openings
• Terminates duct runs cleanly to prevent air bypass and pressure loss
• Standard end cap profile for compatibility with common rectangular duct assemblies
• Suitable for heat duct applications in forced-air HVAC systems

Compatibility

Designed as an OEM-style replacement and standard fitting for 18 by 12 inch rectangular duct systems used in residential and light commercial forced-air heating and cooling installations.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal workers. Shut down the air handling unit and confirm the system is de-energized before modifying any duct section. Secure the end cap to the duct with appropriate sheet metal screws and seal all joints with listed duct tape or mastic sealant in accordance with local mechanical codes and SMACNA guidelines. Do not leave duct joints unsealed, as air leakage at terminations reduces system efficiency.

Technical Specifications

• Duct Size: 18 x 12 inches
• Product Type: Duct Heat End Cap

Standard Information

• Brand: SEAL-TITE
• Manufacturer Part Number: 1210-1812