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High Altitude Conversion Kit (2,001-8,000 ft) for Williams 25,000 BTU Natural Gas Monterey Top-Vent Furnaces (2509622A, 2509822)

High Altitude Conversion Kit (2,001-8,000 ft) for Williams 25,000 BTU Natural Gas Monterey Top-Vent Furnaces (2509622A, 2509822)

New Item!

Model: Williams 9A331

Model: Williams 9A331

$19.99
Qty:

Product Ships On 11/20/2026

The Williams 9A331 converts a 25,000 BTU/h natural gas Williams Monterey top-vent furnace for installation from 2,001 to 8,000 ft. Williams rates its wall furnaces to 2,000 ft; above that, the burner needs a high-altitude orifice sized for the elevation.

The kit includes the orifices for all three elevation bands, so one kit covers any install site up to 8,000 ft.

APPLICATION FIT

Designed for: the Williams 25,000 BTU/h natural gas Monterey top-vent furnace 2509622A and the Monterey Plus 2509822, installed above 2,000 ft.

Skip it when: the furnace is installed at 2,000 ft or below, or it is a different size or fuel. Each Williams furnace has its own high-altitude kit.

What's in the box

  • Main burner orifices for 2,001–4,000 ft
  • Main burner orifices for 4,001–6,000 ft
  • Main burner orifices for 6,001–8,000 ft

Specifications

WHAT DOES INSTALLATION REQUIRE?

Fits 2509622A, 2509822 (Monterey Plus)
25,000 BTU/h natural gas models only.
Elevation 2,001–8,000 ft
Installation Qualified contractor required
Use the orifice for your elevation band and follow the furnace installation manual. Field high-altitude conversion is not permitted in Canada.

System Information
Product Type
High Altitude Kit - Natural Gas

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