Two thoughts to keep in mind when integrating these fans into the cabinet: exhaust requires intake, and noise will change when you increase the static pressure on the fan. For the first part, be sure the cabinet maker provides ways for air to enter so these fans can effectively discharge air and cool the equipment. For the second part, be aware that the noise made by the fans sitting out in the open will be at least somewhat less than the noise they make when in an enclosure that makes it harder for them to draw air. You'll get some sound attenuation at the same time, which will help make up for some of that, but it may not make up for all of the extra noise - especially if the fans are obstructed.