IVT Flue gas flow noise / resonance

Furnace is unusually noisy in flue area; whistling or roaring from vent

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Partially blocked flue, Incorrect flue diameter, Loose flue joints, High fan speed setting

Safety: Turn off power and gas before adjusting flue components.

Inspect flue path: Check all accessible flue sections for obstructions, sagging, or loose joints. Tighten clamps and supports.
Check termination: Ensure the flue terminal is installed per IVT instructions and not partially covered by siding or vegetation.
Review fan settings: Some IVT models allow adjustment of combustion fan speed via parameters; only a technician should change these based on combustion analysis.

Hard 4/5

IVT flue system components

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