Design and Layout
Hot-Aisle Containment, and When It Actually Pays
Containment is sold as a rule but it is really a threshold. Here is where the density math tips from optional to mandatory, and what it costs to cross it.
Containment gets specified reflexively on every hall over a certain size. That is not wrong, but it obscures the real decision: containment is a response to density and row length, not floor area. A short, sparse row does not need it. A long, dense one cannot live without it.
The threshold, not the rule
Our layout model adds containment once a row crosses roughly twenty cabinets, because past that point the mixing of hot and cold air at the row ends stops being a rounding error. Below it, the return-air penalty is small enough that the containment capital is hard to justify.
What crossing the line costs
| Row length | Containment | Added CapEx |
|---|---|---|
| ≤ 20 cabinets | Optional | $0 |
| 21-40 cabinets | Recommended | Moderate |
| 40+ cabinets | Required | Significant |
Draw your hall
Open the configuratorModel a 24-cabinet hallPush the rack count above and below twenty and watch the containment line appear and disappear in the bill of materials. That single toggle is worth more than any rule of thumb.