Air Makeup Unit Technical Training Manual

Section 2

Gas Orifices

MIDCO HMA – Cast iron burner • Natural Gas = #31 • Propane Gas = #45

• MIDCO HMA2 – Aluminum Burner • Natural Gas or Propane Gas = #31

Eclipse/Honeywell AHMA • Natural Gas = 2.4mm • Propane Gas = 2.0

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