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Lennox's older systems have their own code found between hyphens in the

model number.

211=1.5 ton

261=2 ton

311=2.5 ton

411=3 ton

461=3.5 ton

511=4 ton 651=4.5 ton

So, in the case of your example, you have yourself a 3.5 ton, or 42000 pounds.

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13y ago

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