Wacker Neuson 5200003360 20in Adapter Assembly Inlet Box

The Wacker Neuson 20in Adapter Assembly Inlet Box is a genuine OEM component designed for the HI260 and HI1000 series indirect air heaters. As a direct factory replacement, it carries the same dimensional tolerances and material spec as the original, ensuring the inlet duct interface seats correctly and maintains proper airflow geometry into the combustion system. This part is confirmed to fit across multiple HI1000 configurations — including Diesel, Gas, and DGM variants — as well as the HI260 oil-fired heater models.

Key Features

• OEM-Matched Duct Geometry — Manufactured to exact inlet box dimensions, ensuring the 20-inch duct adapter seats flush and forms an airtight connection with the heater housing.
• Direct Drop-In Replacement — Replaces the original 5200003360 assembly with no reworking of the inlet housing or duct mounting points required.
• Broad HI-Series Compatibility — Verified fitment across HI260 and HI1000 indirect air heater variants, including Diesel, Gas, DGM Electric Break, and DGM Surge Brake configurations.
• Sustained Combustion Airflow — A correctly installed inlet box assembly maintains the designed air-to-fuel ratio at the burner; a damaged or ill-fitting adapter disrupts intake flow and can cause inefficient combustion or heater lockout.
• Combustion System Safety — Proper sealing at the inlet box is critical in indirect-fired equipment; a compromised adapter can allow uncontrolled airflow that affects flame stability and burner shutdown response.

The inlet box adapter assembly connects the external duct to the heater's air intake, channeling combustion air into the burner at the volume and velocity the unit is designed to handle. In indirect-fired heaters, the quality of this air intake seal directly affects burner efficiency — a worn, cracked, or poorly fitting adapter allows unmetered air into the system, which can cause inconsistent heat output, nuisance shutdowns, or incomplete combustion. Keeping this assembly in good condition is a straightforward way to maintain the heater's rated output and safe operating behavior throughout the heating season.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

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