Just had a contractor install an aprilaire 500 humidifier, but I'm a little confused about where it's located and how the air flow is being humidified. The aprilaire is installed on the return air side of the stack and pipes to the supply side (not sure I'm wording that correctly, see pic instead). Wouldn't that just create an endless loop of humidified air recirculating back to the aprilaire unit? And wouldn't it be preferable to have the unit on the supply side, so that the humidified air isn't dried out when it passes through the heater again?
source https://hvac-talk.com/vbb/threads/2235598-Aprilaire-500-installation-question?goto=newpost
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