Imperial Mfg Group Usa Inc BM0058 Black Flue Increaser

Product Description

The IMPERIAL MFG GROUP USA INC BM0058 is a 24-gauge black flue increaser designed to transition vent pipe from a 4-inch diameter to a 6-inch diameter in single-wall black stovepipe and flue systems. The large end is crimped for a secure, overlapping slip fit into the next pipe section. This increaser is a standard component in solid-fuel and gas-appliance venting installations where a diameter change is required between the appliance collar and the chimney connector. HVAC and hearth installation technicians install this type of fitting as part of a listed venting assembly.

This increaser is used in residential and light-commercial applications where a stovepipe or flue connector must step up from 4 inches to 6 inches. Typical install scenarios include wood stoves, pellet appliances, and certain gas-fired heating units where the appliance outlet diameter is smaller than the chimney liner or connector pipe diameter. The crimped large end allows it to slip inside a standard 6-inch flue pipe section without additional adapters.

Key Features

• Transitions 4-inch flue pipe to 6-inch flue pipe in a single fitting
• 24-gauge black steel construction for durability in flue environments
• Large end crimped for a secure slip-fit connection into 6-inch pipe
• Single-wall black stovepipe style compatible with standard flue connector systems
• Sold in a package quantity of 10 units

Compatibility

Designed as an OEM-style replacement and standard fitting for single-wall black flue connector systems requiring a 4-inch to 6-inch increaser transition.

Installation Notes

Installation should be performed by a qualified HVAC or hearth technician in accordance with applicable local codes and NFPA 211 venting guidelines. Ensure the appliance and any connected venting is cool and isolated from combustion sources before beginning work. The crimped end inserts into the receiving end of a 6-inch flue pipe section; confirm joint overlap meets manufacturer and code minimums. Secure all joints with at least three sheet-metal screws per connection as required by most venting codes.