The dual-drawer air fryer category has been crowded for a few years now, but most models share the same basic layout: two side-by-side baskets sitting next to each other on the bench. Ninja's DoubleStack XXXL takes a different approach entirely. Instead of spreading outward, it stacks its two drawers vertically — one above the other — in a form factor that is notably narrower than most dual-zone rivals. That design choice alone makes it worth examining carefully, because it changes who this appliance suits and who it does not.
The SL400ANZ is the Black & Silver colour variant sold through Australian retailers including The Good Guys, Myer, Appliance Central, and PBTech. A White variant (SL400WH) is also available through the same platform. The model launched in March 2025 and has accumulated more than 6,400 aggregated reviews across platforms since then.
Who This Suits
The DoubleStack XXXL is aimed squarely at households that cook for larger groups — Ninja rates the 9.5L total capacity as suitable for feeding up to eight people — but where bench space is genuinely limited. The vertical footprint of 28.6 cm wide by 48.8 cm deep is substantially narrower than most full-size dual-basket units, which typically spread 40 cm or more across the counter. If you have been avoiding a dual-zone air fryer purely because of bench width, this is the model most likely to fit.
It also suits people who cook multiple components simultaneously and want them to finish at the same time — a common frustration with cooking proteins and sides in sequence. The Smart Finish function addresses this directly.
It is less obviously suited to compact singles or couples who already find a single-drawer air fryer adequate, or to kitchens where depth (at nearly 49 cm) is the binding constraint rather than width.
Verified Strengths
Vertical stacking saves bench width. The 28.6 cm width figure is confirmed across official Ninja AU and SharkNinja AU product pages. For a two-drawer appliance this is genuinely compact horizontally, even if the depth and height footprint is not small.
Two independently controlled zones. Each 4.75L drawer runs its own temperature and timer settings independently. You can air fry chips in one drawer while roasting vegetables in the other at a different temperature and have them finish together using the Smart Finish function.
Four cooking levels from two drawers. Each drawer ships with a removable stacked meal rack, meaning you can cook on two levels within a single drawer. In theory you can run four layers of food simultaneously — two per drawer — though how practical this is depends on what you are cooking and airflow requirements.
Six cooking functions. The SL400ANZ supports Air Fry (150–230°C), Max Crisp, Roast (120–200°C), Bake (120–200°C), Reheat (150–200°C), and Dehydrate (27–90°C). The dehydrate range bottoms out at 27°C, which covers low-temperature drying work that some competing models cannot handle.
Match Cook mode. If you want both drawers running identical settings — the same food in double quantity — Match Cook mirrors the settings from one drawer to the other without having to enter them twice.
Easy cleaning. Crisper plates and drawers are confirmed dishwasher safe. All removable parts are BPA free.
2-year warranty. Confirmed from the official Ninja AU product page.
CHOICE coverage. CHOICE independently evaluated this model and reported an 80% score, noting it as a standout for meal-prepping. Taste.com.au named it Best for Meal-Prepping in their 2025 air fryer roundup. Letherium has not independently tested the unit; these assessments are from those respective publications.
Trade-offs and Limitations
It is heavy. At 10.2 kg (per official Ninja AU and SharkNinja AU pages — PBTech lists 10.5 kg, a minor discrepancy likely reflecting measurement or packaging differences), this is not an appliance most people will move around regularly. If you plan to store it in a cupboard and bring it out as needed, factor the weight in.
Depth is not small. At 48.8 cm deep, it will reach nearly halfway across a standard 60 cm benchtop. The width advantage is real, but this is not a compact appliance in absolute terms.
Higher wattage draw. At 2270W, this pulls more power than many single-drawer units. Most Australian homes can accommodate this on a standard 10A circuit, but it is worth being aware of if you are running multiple high-draw appliances simultaneously.
The fat-reduction claim warrants context. Ninja states up to 75% less fat than traditional deep frying, tested against hand-cut deep-fried French fries. This is a manufacturer claim, not independently verified by Letherium, and the comparison baseline matters — the result will vary significantly depending on what you are cooking and how you would otherwise prepare it.
RRP positions this at the premium end. The listed RRP of AUD $499.99 (from the official Ninja AU store, confidence 0.95) places it firmly in premium dual-zone territory. Street pricing at Australian retailers may differ; check current pricing before purchasing.
Key Verified Specifications
| Specification | Detail |
|---|---|
| Model | SL400ANZ (Black & Silver) |
| Total capacity | 9.5L (two 4.75L drawers) |
| Cooking functions | Air Fry, Max Crisp, Roast, Bake, Dehydrate, Reheat |
| Temperature – Air Fry | 150°C – 230°C |
| Temperature – Roast/Bake | 120°C – 200°C |
| Temperature – Reheat | 150°C – 200°C |
| Temperature – Dehydrate | 27°C – 90°C |
| Wattage | 2270W |
| Voltage | 220–240V~, 50–60Hz |
| Dimensions (W × D × H) | 28.6 × 48.8 × 38.5 cm |
| Weight | 10.2 kg (official; 10.5 kg per PBTech) |
| Smart features | Smart Finish, Match Cook |
| Stacked meal racks | 2 (one per drawer, 2-level cooking per drawer) |
| Dishwasher safe | Yes — drawers and crisper plates |
| BPA free | Yes |
| Warranty | 2 years |
| RRP (AUD) | $499.99 |
Sources: Ninja Kitchen AU, SharkNinja AU, The Good Guys, Myer, Appliance Central, PBTech, SL400ANZ owner's manual (ManualsLib).
Buying Considerations
Check your bench depth, not just your width. The DoubleStack's selling point is its narrow width, and that advantage is real. But at 48.8 cm deep it still claims significant counter real estate front-to-back. Measure both dimensions before purchasing.
Consider who you are cooking for. A 9.5L capacity is large. If you regularly cook for four or more people, or you do batch meal prep, this capacity makes sense. For a household of one or two, a smaller single-drawer unit at a lower price point may be more appropriate.
The vertical drawer arrangement is meaningfully different from side-by-side. Loading and unloading from drawers that open toward you (rather than side by side) changes the ergonomics in practice. If possible, look at the unit in a physical store before buying.
Smart Finish is genuinely useful for multi-component meals. The ability to set different cook times in each drawer and have both finish simultaneously removes a real coordination problem from cooking a main and a side together. This feature is what distinguishes dual-zone cooking from simply running one batch after another.
At AUD $499.99 RRP, shop around. The SL400ANZ is stocked by The Good Guys, Myer, Appliance Central, and PBTech among others. Retailer pricing and promotional discounts will vary.
Verdict
The Ninja DoubleStack XXXL (SL400ANZ) is a well-specified, genuinely differentiated dual-zone air fryer. Its vertical stacking design produces a real-world width advantage over conventional side-by-side dual-basket models, and the combination of two independently controlled 4.75L drawers with stacked meal racks inside each gives it cooking flexibility that single-zone units simply cannot match. At AUD $499.99 RRP it carries a premium price, and its weight and depth mean it is not a casual purchase. But for households cooking for four or more people regularly — particularly those who have avoided dual-zone models purely due to bench width — it presents a more practical case than most alternatives in the category.
CHOICE's independently reported 80% score and taste.com.au's Best for Meal-Prepping recognition in 2025 both point in the same direction, though buyers should read those full assessments for complete context.
Check current pricing and availability on Amazon Australia
Specifications and features confirmed from official Ninja Kitchen AU, SharkNinja AU, and authorised Australian retailer listings for model SL400ANZ. Letherium has not physically tested this product. RRP at time of research: AUD $499.99. CHOICE and taste.com.au assessments are those of their respective publications.