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The furnace is part of an HVAC or central heating system used to generate heat. Typically this is done with gas, a heat pump, or an electric element. For hot water and radiator based heating, use the boiler tag.

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How to locate the air filter in LENNOX gas furnace Model CX34-43C-6F-1

I just moved to a Toronto house with a LENNOX gas furnace Model CX34-43C-6F-1 installed in April 1991. Notwithstanding 30 minutes search, I can't locate the air filter. Where can I find it? …
Kenneth K Y Chan's user avatar