Imperial BM0073 Black Flue Reducer 5x4 in 24 Gauge

Product Description

The IMPERIAL MFG GROUP USA INC BM0073 is a 24-gauge black steel flue reducer designed to transition between a 5-inch flue outlet and a 4-inch flue pipe. The small end is factory-crimped for a secure, tool-assisted slip fit into standard single-wall black flue pipe. This type of reducer is a common component in residential gas appliance venting systems, used wherever a larger-diameter flue collar steps down to a smaller-diameter pipe run. HVAC technicians and plumbers install these during new appliance setups or when retrofitting venting to meet updated appliance specifications.

This reducer is suited for single-wall black flue applications on gas furnaces, water heaters, boilers, and similar Category I vented appliances that exhaust through B-vent or single-wall black pipe systems. The crimped small end seats into the receiving end of a 4-inch flue pipe section without additional fabrication. Sold in packages of 10 units, making it practical for contractors stocking venting hardware for multiple installations or service calls.

Key Features

• Transitions from 5-inch inlet to 4-inch outlet in a single fitting
• 24-gauge steel construction for standard residential flue applications
• Black finish suitable for single-wall gas appliance venting
• Factory-crimped small end allows direct insertion into 4-inch flue pipe
• Packaged in quantities of 10 for contractor convenience

Compatibility

Designed as an OEM-style replacement and standard-stock fitting for single-wall black flue pipe systems on residential gas-vented appliances requiring a 5-inch to 4-inch diameter reduction.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber in accordance with the appliance manufacturer instructions and applicable fuel gas codes such as the IFGC. Shut down and allow the appliance to cool completely before disconnecting any flue sections. Secure all joints with at least three sheet metal screws per connection as required by code, and verify the completed vent system for proper draft before returning the appliance to service.