Rack
Hot aisle
Cold aisle
Containment door
Clearance
Block wall
Corridor
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The Data Hall Layout Generator produces a scaled, to-the-millimeter 2D floor plan of a data hall — rack rows, hot/cold aisles, containment doors, perimeter clearance, and the surrounding block wall and corridors — directly in your browser, with no CAD software or account required. Once a layout looks right, export it as a real AutoCAD-compatible DXF (with proper layers, blocks, and dimension lines) or a vector PDF spec sheet, both generated locally on your machine.
Rack rows are almost always arranged front-to-front and back-to-back, so cold supply air and hot exhaust air never mix — the pair of aisles this creates are contained (physically enclosed, usually with a roof and end-of-row doors) to stop that mixing entirely. Hot Aisle Containment (HAC) encloses the hot exhaust aisle, leaving the room itself as one shared cold-air reservoir; Cold Aisle Containment (CAC) does the opposite, enclosing the cold supply aisle and leaving the room to fill with warm return air. Both approaches raise cooling efficiency by preventing bypass and recirculation air, and the choice between them usually comes down to existing room conditions, fire-suppression rules, and mechanical design rather than one being universally "better."
Given a rack size, a rack count per row, and a number of rows, the generator lays rows out with rack fronts and backs alternating down the room. Aisles fill every gap between adjacent rows, strictly alternating hot/cold and always starting with whichever type you've set as contained — so hot and cold aisles are never adjacent to each other. If the row count is odd, the last row would otherwise only ever face the uncontained aisle type, so the generator adds one extra contained-type aisle after it, keeping every single row bordered by a contained aisle on at least one side.
A containment door is drawn flush against both ends of every contained aisle (this is what actually seals the hot or cold air in), and perimeter clearance — your maintenance/access margin — is measured outward from the outer edge of those doors, not the row block itself, so the number you enter is the clear walking distance you actually get. Around all of that sits a 200 mm block wall, with optional Technical Corridors (side access, for cabling and maintenance) and Access Corridors (front/back, typically for equipment moves) — enable either from the Building Walls section, and where a corridor sits flush against the data hall, the two share one wall rather than drawing a doubled-up one.
Download DXF writes a real AutoCAD drawing exchange file: racks, aisles, doors, walls, and corridors are all on separate, correctly named and colored layers (RACKS, HOT_AISLE, COLD_AISLE, DOORS, WALLS, DIMENSIONS, and so on), so it opens ready to annotate or merge into a larger CAD set. It also offers an array export — repeat the current module as a rows×columns grid of identical data halls, optionally separated by an inter-module corridor every N columns, for masterplanning a multi-hall facility from one design. Export PDF produces a vector spec sheet of the same drawing (with a legend and an inputs summary in the corner) for sharing with people who don't have CAD software.
Yes — no account, no sign-up, and no data ever leaves your browser. Every calculation, drawing, and export happens locally on your machine.
Leaving Room Width/Length blank lets the tool work out the exact minimum footprint your rows, aisles, doors, and clearance actually require — a number that's tedious to hand-calculate correctly, especially once containment doors and asymmetric odd-row aisles are factored in. You can always enter a larger fixed size afterward once you know the true minimum.
The generator tells you exactly how much width or length is missing rather than silently clipping or overlapping anything, so you always know precisely how much more room you need.
The DXF export is a genuine, layered CAD file suitable as a starting point for design development, but it should always be reviewed and stamped by a qualified engineer before construction — this tool automates layout geometry, not engineering sign-off.
Millimeters, meters, or feet — pick whichever your project standard uses; every dimension field and export scales to match.