I'm looking into installing a range hood. I'd like to install the motor in the next room, right on/in the wall that has the exhaust port. There are many companies offering external motor/rotor combinations for this exact purpose, but they always seem to cost about what a cheaper range hood with internal motor would cost, even when only in the 500m³/h range. A blower from a usual hood will produce about 400-900Pa pressure stoppered, or 600-1000m³/h flow, free blowing. Every design i saw (internal and external blower) was a radial rotor setup.
My question: I there a difference between the design for suction (as an external motor mainly needs to produce) vs. the design for pressure (as an internal motor mainly needs to produce) - or could i remove the motor from an internal design and just house it and install it externally? Is suction more difficult to produce and therefore more expensive, or are the products on the market just more rare and thus more expensive?