Weil McLain 450-021-242 Draft Diverter

The Weil-McLain 450-021-242 Draft Diverter is a critical atmospheric venting component designed specifically for CG, CGX, and CGI Series gas-fired boilers. This 5" to 6" integral draft hood ensures proper combustion gas dilution and maintains a consistent neutral pressure point at the flue outlet, protecting the burner flame from down-drafts and fluctuating chimney pressures. Engineered for durability, this replacement part facilitates the transition from the collector hood to the B-Vent system, ensuring the system meets ANSI Z21.13 standards for safe appliance operation. For technicians in the field, this diverter is essential for resolving spill switch tripping issues or replacing warped hoods that compromise draft hood relief. Precise alignment with the vertical flue pipe is required to maintain the buoyancy of combustion products and prevent CO accumulation in the mechanical room.

Technical Specifications & Key Benefits:

• OEM Compatibility: Specifically engineered for Weil-McLain CG-2.5 through CG-6 and CGI series residential boilers.
• Venting Transition: Adapts a 5-inch appliance outlet to a 6-inch Type B gas vent for optimal flue gas velocity.
• Safety Compliance: Maintains the required dilution air ratio to prevent pilot outage and erratic flame patterns caused by chimney fluctuations.
• Heavy-Gauge Construction: Built to withstand high-temperature flue gases without premature oxidation or structural deformation.
• Streamlined Installation: Features pre-drilled mounting points for a secure fit to the boiler collector hood.

Common Installation Questions:

Why is the draft diverter essential for atmospheric boilers?
The Weil-McLain 450-021-242 isolates the combustion chamber from external wind conditions and chimney draft variations. Without a functional diverter, you risk incomplete combustion or "sooting" due to excessive or insufficient airflow through the heat exchanger.

Can this diverter be used on condensing or high-efficiency models?
No. This component is strictly for Category I atmospheric appliances. It is not compatible with Category IV positive-pressure or condensing systems that require sealed combustion and PVC/CPVC venting.

What causes a draft hood to fail or leak flue gases?
Blockages in the chimney or improper vent sizing can cause combustion gases to "spill" from the diverter. Always check the thermal spill switch and ensure the chimney is generating sufficient inches of water column (WC) draft during startup.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.