If you have or get the installation manual for the furnace it will describe the kind of filter needed. The air filter seems undersized for a large furnace. But it may be properly sized, especially if it's in a large house or you have a cold climate. That furnace has an unusually large BTU input, especially for a high efficiency furnace. I haven't been able to find a manual for the furnace to verify the amount of filter area that is recommended. I fear that the bank took the cheap way out when installing this furnace, and didn't do what was right for the situation.Īny input would be greatly appreciated. Is that an appropriately sized filter? All other large/high efficiency furnaces I have encountered have had much larger (3-5" thick) filters. It deflects 2-3" after it has been used in the furnace for a day or two (the blower runs constantly after the rollout switch has been tripped). Issue #2 is that the filter (16x25x1) is horribly bowed when I pull it out. I've read that this could be due to intake restrictions, which leads me to #2. It trips within 10-15 minutes, each time. I reset it a few times (only while standing next to the furnace to make sure it doesn't catch fire). Issue #1 is that the flame rollout switch is getting tripped. I'm having two issues, which I think may be related: As a result, I have no information on the furnace's history. I have a feeling that the previous owner sold the furnace that existed in the house (he sold everything else), and the bank replaced it with this unit. The furnace appears to be new, or almost new.
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