Replacement floor furnace grill 21'1/2 x 31'1/2?

Where can I order one?

Answers:
The grill you refer to sounds as though it's a return-air grill. In other words, it returns air to the furnace and does not blow hot air outwards. If that's the case, you might find a return-air floor grill at a wrecking company that sells salvaged material. A heating supply house may be able to get you close but you might have to do some carpentry modifications on the floor opening. Good luck.

Other answers:
Sears

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Sears

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A 21 foot by 31 foot grill is huge! I don't think Sears will have it.

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