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****This is copied from my build thread***** be sure to check out the links I have. There are several ways to mount this heater. Everything I've read online regarding this heaters has been positive.
Ok so I've been doing a bit of reading online about this Summit heater system. People are mounting them split blower in engine bay and ducting in the vent lines.
This guy mounted his whole unit in the engine bay then only ran the ducts inside. Scroll down to post #4
I've decided that I am going to mount the heater box entirely in the engine bay and just cut three holes through the firewall for the vents.