Air Flow Products MTD1008 Conical Spin-in Takeoff Damper

Product Description

The AIR FLOW PRODUCTS MTD1008 is a metal duct conical spin-in takeoff fitting with an integral damper, sized at 10 inches by 8 inches. This fitting is used to branch conditioned air from a main trunk duct into a branch run, and the built-in damper allows the installer to balance airflow at each takeoff point. Fabricated from sheet metal, it installs directly into a round knockout or cut opening in a rectangular or round trunk duct. HVAC sheet metal mechanics and duct installers are the primary trade installing this fitting during new construction and retrofit duct work.

The MTD1008 is suited for low-pressure residential and light commercial forced-air duct systems where a clean, spin-in connection to a branch duct run is required. The conical collar seats firmly into the trunk opening and locks in place with a spin-and-lock action, reducing the need for additional fasteners at the connection point. The integral damper blade allows field adjustment of airflow volume through the branch after installation, supporting duct balancing without separate damper hardware.

Key Features

• Conical spin-in design seats and locks into trunk duct openings for a secure, low-leak connection
• Integral damper blade allows on-site airflow balancing at the takeoff point
• 10-inch trunk connection by 8-inch branch outlet sizing
• Sheet metal construction for durability in low-pressure forced-air applications
• Compatible with standard round knockout and field-cut trunk duct openings

Compatibility

Designed as an OEM-style replacement or new-installation fitting for residential and light commercial forced-air duct systems requiring a conical spin-in takeoff with integral damper at a 10-inch by 8-inch transition point.

Installation Notes

Installation is performed by a qualified HVAC sheet metal mechanic or duct installer. Shut down the air handling unit and confirm the system is de-energized before cutting into an existing trunk duct. The conical collar is inserted into the prepared round opening and rotated to engage the locking tabs; seal the perimeter with UL 181-rated foil tape or mastic sealant to minimize air leakage. Adjust the integral damper blade after system startup during the duct balancing procedure.

Technical Specifications

• Trunk Connection Size: 10 inches
• Branch Outlet Size: 8 inches
• Fitting Type: Conical Spin-In Takeoff with Damper
• Material: Sheet Metal

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: MTD1008