Honeywell Venturi 45900450N-010B

The Honeywell Venturi 45900450N-010B is a gas-air mixer (venturi) designed for use in condensing boilers and premix burners with power up to 137 kW. It features a flange mounting of 110 mm and a throttle for precise gas:air ratio control. The body is made of aluminum alloy. This component operates on the Bernoulli principle, mixing air and gas to create a homogeneous fuel-air mixture for stable combustion.

Parts of this type are selected by matching the required air mass flow and gas pressure drop at the burner's operating point. The geometric dimensions—throat diameter, inlet/outlet diameters, and overall length—must match the original to preserve the air-to-gas ratio curve. Verify the orientation (straight or angled outlet) and the type of gas inlet seal (o-ring, gasket, or compression fitting). Also check whether the venturi includes an integrated gas nozzle or relies on an external orifice.

Failure of such parts can lead to unstable flame, high CO levels, or incorrect mixing. Physical damage or wear may cause leaks or improper gas flow. Check for cracks, deformation, or blockages in the venturi throat and gas inlet.