Thanks for the info! I'm honestly surprised to hear that there isn't any reason to clean out a 70 year old furnace. Don't the heat exchangers get packed with dust? I'm a PC repair tech so I spend a lot of time cleaning heatsinks and fans to improve heat dissipation. I know they exchanger isn't going to have such fine fins, I just can't imagine having that much air moving through a system for that many years without it needing cleaned out. Maybe the exchangers aren't built the way I'm picturing them. I'd love to see some picture of one of these things broken down. Now that I think about it, I do own a boroscope camera. I should just look down in there from the top to see for myself what it looks like. It's interesting that right at the top of the unit there's a small door. It might be related to the humidifier system built into the unit. That system is hooked up but we've never bothered running it. Also, is that cheapo light weight filter sufficient for something like this? They're like $2 a piece at a local hardware store. I can buy all that I need and replace them often without spending an arm and a leg.
source https://www.inspectorsjournal.com/topic/18995-maintaining-a-vintage-1950s-1960s-holland-forced-air-gas-furnace/?do=findComment&comment=173548
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