Some cabinets/racks require additional airflow due to their thermal load or kW. One way to increase cooling airflow to these cabinets or aisles is through high volume perforated tiles. Quite simply the more holes or grate openings (percentage of opening) the greater the flow or CFM. One word of caution ... increasing the supply does not benefit the rack or the row if the problem is not supply but rather recirculation (see containment). Likewise, understand that when you increase supply in one area you decrease it in another. This illustrates the value of engineering tile placement (see Engineering).

Perforated Tile Type: Nominally 25%-open perforated tiles should generally be used, as they provide a good balance of low-pressure drop and relatively uniform underfloor pressure. High flow tiles (e.g., 56% open) can allow more airflow at a given pressure but lead to less uniform and predictable distributions. It is possible to mix low and high flow tiles in a single system, but it may be necessary to verify the performance of such a nonstandard installation through CFD modeling or through testing and measurement.