It isn't very restrive ,inlets and outlets are both about 15mm .I would say it has about the same surface area as an average heatercore as it is nearly 12" * 6" *1" thick instead of 6"*6" *2" .I assume that is the size of the average heater core. My reasoning for going for a thin rad is that it won't be too restrictive for air going through it .
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