Mm Manufacturing 400-12X10 Tapered Reducer 12x10 in Duct Fitting

Product Description

The MM MANUFACTURING 400-12X10 is a tapered reducer fitting designed for HVAC ductwork systems. It transitions airflow from a larger duct opening to a smaller one, reducing the cross-section smoothly to maintain static pressure balance and minimize turbulence in the air distribution system. This unit measures 12 inches by 10 inches and is part of the 400 series tapered reducer line. HVAC sheet metal installers and ductwork contractors install this fitting during new construction and retrofit applications where duct sizing changes are required along a trunk or branch run.

This fitting is suited for residential and light commercial forced-air systems where trunk-to-branch or main-to-takeoff transitions are needed. It is part of the 400 series, which is available in 42 size combinations ranging from 4 inches by 3 inches up to 24 inches by 22 inches. This allows contractors to source consistent fittings across multiple duct sizes within the same system or project.

Key Features

• Tapered reducer profile supports smooth airflow transition with reduced turbulence
• 12 inch by 10 inch opening size fits common residential and light commercial duct configurations
• Part of a 42-size combination product series for consistent fitting selection across a full duct system
• Lightweight at 1.05 pounds for easier handling and installation overhead or in tight spaces
• Compact profile with an 8 inch height for installations with limited plenum or ceiling cavity clearance

Compatibility

Designed as an OEM-style ductwork fitting for use in forced-air HVAC systems requiring a tapered transition from a 12 inch duct to a 10 inch duct. Part of the MM MANUFACTURING 400 series, which covers size combinations from 4 inches by 3 inches through 24 inches by 22 inches.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified sheet metal installers. Power down the air handler and confirm the system is de-energized before working in the duct system. Secure the fitting to adjoining duct sections using sheet metal screws and seal all joints with UL 181-listed mastic or foil tape per local mechanical code requirements. Do not use this fitting to force connections between incompatible duct shapes without appropriate transition adapters.

Technical Specifications

• Length: 12 inches
• Width: 12 inches
• Height: 8 inches
• Weight: 1.05 pounds

Standard Information

• Brand: MM MANUFACTURING
• Manufacturer Part Number: 400-12X10