Air Flow Products MTD108 Conical Spin-in Takeoff Damper 8 in

Product Description

The AIR FLOW PRODUCTS MTD108 is a metal duct conical spin-in takeoff fitting with an integrated damper, designed for branch duct connections in low-pressure forced-air HVAC distribution systems. The conical spin-in design allows the fitting to seat securely into a pre-punched or field-cut hole in round or flat oval trunk duct, providing a low-turbulence transition from the main trunk to a branch run. The built-in damper allows airflow balancing at the takeoff point without a separate balancing component. This fitting is sized at 8 inches and is installed by sheet metal mechanics and HVAC technicians during new construction and retrofit ductwork installations.

This takeoff is suited for residential and light commercial forced-air systems where branch duct feeds are taken directly off a main supply trunk. It is commonly used in ceiling plenum applications, horizontal trunk duct runs, and retrofit scenarios where airflow rebalancing is needed at individual branch points. The damper blade allows the technician to throttle airflow to individual zones or rooms during system commissioning without requiring additional hardware.

Key Features

• Conical spin-in design seats securely into trunk duct for a tight, low-leak fit
• Integrated damper allows on-site airflow balancing at the branch takeoff point
• 8-inch collar size fits standard branch duct connections
• Metal construction for durability in both new construction and retrofit applications
• Eliminates the need for a separate balancing damper on the branch run

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 8-inch branch connections in residential and light commercial forced-air supply duct systems.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal mechanics. Power down the air handling unit and any associated electrical controls before cutting into an existing trunk duct. The conical spin-in collar is inserted into a field-cut or pre-punched hole and rotated to lock in place; secure with sheet metal screws and seal all joints with listed duct sealant or UL 181-rated tape per local mechanical code requirements. Do not overtighten the locking collar, as this may distort the trunk duct wall.

Technical Specifications

• Collar Size: 8 inches
• Material: Metal
• Damper: Integrated
• Fitting Type: Conical Spin-In Takeoff

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: MTD108