Ducting for CPU heatsink; would this work?

Scenario: using a skyscraper style heatsink, you would run a duct from a top intake fan to the front fan of the heatsink then another duct from the back fan of the heatsink to a exhaust fan at the back of the case. As well, the two sides of the heatsink will be sealed to create a windtunnel effect.

Question: if someone is able to rig a setup like this thereby creating a windtunnel effect, will it work? and will it improve the cooling of the cpu? Please disregard the details of actually "creating" such a setup; I just would like to know whether the theory is workable.

Really? Cause I have never seen such a setup. I haven't actually even heard of it discussed. Anyone else seen or tried such a setup?

Intake at the top? This should only be exhaust. Think about the natural flow of hot air...it rises. So, this is why most cases intake cool air in the front (lower) area of the case and exhaust out the top and rear-top by the PSU. Ducting cool air directly in from the side or front-bottom of the case to the CPU cooler and then 'pulling' that air out via a fan at the top or rear would get you a desired effect. BUT, you also have to understand that the CPU fan is also designed to circulate air in the case over other components, like MOSFETs, RAM, etc.

The answer to your question is yes.

There are duct kits that are available from online vendors.

There is a problem! Don't forget that other components also need to be cooled. By creating an enclosed wind tunnel you might be preventing other components from being adequately cooled. A lot will depend on actual configuration.