Very-narrow-aisle (VNA).
5–6 ft aisles. Up to 45 ft height. Wire-guided or rail-guided. The max-cube system for warehouses where every square foot has to earn rent.
Height over aisle width.
VNA narrows the working aisle to 5–6 ft and pushes the racking up — commonly 30–45 ft — so the cube you can't get sideways, you get vertically. You keep 100% selectivity: every pallet stays directly accessible, unlike drive-in or push-back.
The trade is the truck. VNA runs on rail-guided or wire-guided forklifts — turret trucks and SOTOs that stay centred in the narrow aisle. The floor slab, guidance system, and rack design are engineered together as one system.
The components, labeled.
The aisle is the system. The diagram compares the same floor two ways — a standard turning aisle and a guided very-narrow aisle.
Counterbalance Truck
A standard counterbalance truck turns its whole body to face the rack, so the aisle has to fit its turning circle — roughly twelve feet. That turning room is floor you cannot store on.
Turret Truck
A turret truck rotates its forks and head; the body never turns in the aisle. That is what lets the aisle shrink to five or six feet.
Floor Guidance
A wire in the slab or a floor-mounted rail guides the truck down the aisle centreline. Guidance holds fixed clearance to both rack faces at travel speed.
Rack Row (Plan)
The rack rows themselves stay conventional — the aisle between them is what changes. The same footprint holds more pallet positions once the turning aisle disappears.
Why very-narrow-aisle (VNA)?
Because square-foot rent forces you upward. VNA converts 30% wider aisles into 30% more vertical storage. The right choice when you can't expand horizontally and need 100% selectivity at height.
Full technical detail.
| Specification | Standard VNA | Heavy VNA | Max-Bay VNA |
|---|---|---|---|
| Aisle & Height | |||
| Aisle width | 5'-6' | 5'-6' | 5'-6' |
| Max height | 30' | 40' | 45' |
| Guidance | Rail-guided | Rail or wire-guided | Wire-guided |
| Frame & Beam | |||
| Post profile | 3" structural | 3" structural | 3.5" structural |
| Post gauge | 12ga | 11ga | 10ga |
| Beam profile | Heavy step beam | Heavy step beam | Structural C-beam |
| Capacity (Beam Pair) | |||
| Beam pair capacity | 3,800 lb | 4,500 lb | 5,500 lb |
| Frame capacity | 30,000 lb | 45,000 lb | 60,000 lb |
| Slab & Anchors | |||
| Slab spec | 6" min, 3,500 PSI | 6" min, 4,000 PSI | 8" min, 4,000 PSI |
| Anchor size | 5/8" | 5/8" | 3/4" |
| Anchors per footplate | 4 | 4 | 6 |
| Finish & Compliance | |||
| Finish | Powder-coat or galv | Powder-coat or galv | Galvanized |
| CSA A344-17 aligned | ✓ | ✓ | ✓ |
| ANSI MH16.1 (RMI) aligned | ✓ | ✓ | ✓ |
| Operations | |||
| Lead time | 3-4 weeks | 4-5 weeks | 5-7 weeks |
| Install crew size | 4-5 | 5-6 | 6-8 |
| Permit required | Usually | Yes | Yes |
Send your warehouse dimensions + SKU profile + throughput target. We'll come back with a stamped layout + itemized quote within 5 business days. Or grab the VNA Spec Sheet above to size it yourself — every layout load-rated to CSA A344-17.
Where very-narrow-aisle (VNA) wins.
Max-cube warehouses
When square-foot rent is the binding constraint. VNA converts 30% wider aisles into 30% more vertical storage.
Mixed-SKU + height-extreme
Where you need 100% selectivity AND height utilization. VNA preserves selective access while doubling stack height.
Automation-ready
VNA's strict aisle tolerances are the same tolerances autonomous mobile robots (AMRs) need. Easier upgrade path than wide-aisle selective.
VNA vs. the alternatives.
Max cube + selectivity
5–6 ft aisles, up to 45 ft. 100% selectivity, guided trucks. Best when you can't expand sideways.
This productFull selectivity
Wide aisles, standard reach trucks. Every pallet accessible. Industry standard, 3–5 day lead.
View product →Density + pick speed
2–6 deep, LIFO, single-aisle access. +90% vs selective. Faster to pick than drive-in.
View product →
STOCK · loaded high-bay aisle · real 416 job photos rolling outWhere VNA earns its keep.
GTA warehouses where horizontal expansion is off the table and the clear height is there to use. Square-foot rent is the binding constraint, the SKU mix needs full selectivity, and the floor can take a guided truck. VNA gives you the cube without giving up access to any pallet.
It's also the cleanest on-ramp to automation: the tight aisle tolerances VNA already demands are the same ones autonomous mobile robots need, so the upgrade path is shorter than from wide-aisle selective.
Build your VNA layout.
Send your warehouse dimensions and we'll come back with a stamped layout + itemized quote. Pick your space, watch it assemble, and get a ballpark in 60 seconds.
60 seconds · no obligation · across the GTA · (647) 692-4416