Imperial Mfg Group Usa Inc BM0242 Cast Iron Damper 4 Inches

Product Description

The IMPERIAL MFG GROUP USA INC BM0242 is a 4-inch cast iron barometric damper designed to regulate draft pressure in venting systems. Cast iron construction gives it the mass and heat tolerance needed for sustained operation in high-temperature flue applications. It is typically installed inline with a B-vent or single-wall connector on oil-fired or gas-fired heating equipment. HVAC technicians and heating service professionals install this component to maintain consistent negative pressure in the flue, preventing over-drafting and improving combustion efficiency.

This damper is suited for residential and light commercial heating systems where a 4-inch vent connector is present. It is commonly installed on oil furnaces, oil boilers, and similar fossil-fuel appliances that require draft control. The unit-of-measure is each, and the part ships in packages of 12, making it a practical stocking item for service contractors who perform regular heating equipment installations and replacements.

Key Features

• 4-inch diameter fits standard 4-inch vent connectors and flue pipe
• Cast iron body provides durability under continuous elevated temperatures
• Barometric draft regulation helps stabilize combustion in oil and gas appliances
• Packaged 12 units per case for contractor-friendly stocking
• Single-unit (EA) sell quantity available

Compatibility

Designed as an OEM-style replacement or new-installation barometric damper for heating appliances using 4-inch single-wall or B-vent flue connectors. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation is typically performed by a licensed HVAC technician or heating contractor. Shut down the appliance and allow the flue system to cool completely before beginning work. The damper must be installed in the vent connector in accordance with the appliance manufacturer instructions and local mechanical codes, including applicable sections of the IFGC or NFPA 31 for oil-fired equipment. Do not restrict the damper counterweight movement after installation, as proper swing travel is required for correct draft regulation.