Rock the Gas Heat ESCO Exam 2026 – Fire Up Your Future in HVAC!

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What should the inlet pressure be to the manifold of a natural gas furnace?

1-3 in WC

The correct answer is A. 1-3 in WC. Inlet pressure to the manifold of a natural gas furnace should typically be within the range of 1-3 inches of water column (WC). This range ensures that the gas flow is at an appropriate pressure level for efficient and safe operation of the furnace.

Options B, C, and D provide higher pressure ranges, which could lead to an over-supply of gas to the furnace, potentially causing damage or safety hazards. It is important to maintain the correct inlet pressure to ensure the furnace operates effectively and safely.

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2-4 in WC

3-5 in WC

5-7 in WC

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