Ninja Double Stack 9.5 L Air Fryer – Smart Stack & Precision Cooking

The Ninja Double Stack 9.5 L Air Fryer with Smart Cook System (SL451UK) transforms the way you cook at home. Featuring a compact vertical design, this air fryer takes up less counter space while still delivering powerful performance and high-capacity cooking. It’s perfect for those who want healthy, quick, and flexible meal prep without cluttering their kitchen.

Compact Yet Powerful Design

Unlike traditional side-by-side dual-drawer air fryers, the Double Stack features a unique stacked drawer system. This vertical build holds two large 4.75 L drawers—providing a total of 9.5 L capacity—while using 30% less counter space. It fits comfortably under most kitchen cabinets, making it ideal for compact spaces.

Despite its compact size, the two drawers can cook on two levels each, giving you four layers of cooking space. This is ideal for preparing multiple dishes at once—meat in one drawer, vegetables in the other, or even full meals for large families.

Smart Cook System with Temperature Probe

One of the standout features of this model is the Smart Cook System, which includes a built-in digital cooking probe. Insert the probe into your meat or fish, and the air fryer will monitor the internal temperature and automatically stop cooking when the desired doneness is reached. This ensures perfect, juicy results every time—no guesswork or overcooking.

Whether you prefer rare steaks or fully cooked chicken, the Smart Cook System adjusts everything for you. It’s a game-changer for home cooks looking for restaurant-quality results.

Six Versatile Cooking Functions

This air fryer comes with six preset cooking modes that allow you to prepare a wide variety of meals:

• Air Fry: For crispy, golden results with little to no oil.

• Max Crisp: Delivers extra crunch to frozen foods using high heat.

• Roast: Great for meats, vegetables, and one-pot dinners.

• Bake: Perfect for desserts, pastries, and baked goods.

• Dehydrate: Make homemade fruit chips, jerky, and healthy snacks.

• Reheat: Gently reheat leftovers without drying them out.

Each drawer operates independently, so you can bake in one drawer and air fry in the other at the same time.

SYNC and MATCH Features

With its SYNC function, you can cook two completely different dishes with different times, temperatures, and modes—and both will finish at the same time. The MATCH function allows you to duplicate the same settings in both drawers, ideal when preparing larger batches of the same dish.

These intelligent settings reduce stress and simplify multi-dish preparation, making this air fryer a practical tool for weeknight dinners, meal prep, or family get-togethers.

Fast, Healthy, and Energy Efficient

The Ninja Double Stack cooks up to 55% faster than conventional ovens, saving time and energy. It also uses up to 75% less fat than deep frying, offering a healthier alternative to traditional methods. With high-powered fans and heating elements behind each drawer, it ensures even air circulation and consistent results on every level.

Easy to Use and Clean

Each drawer includes a non-stick crisper plate and meal rack that allow for multi-layer cooking. All parts are removable and dishwasher-safe, so clean-up is quick and simple. The LED touchscreen interface is clear, intuitive, and easy to navigate.

The fryer also includes a built-in handle lock, ensuring drawers stay securely in place while cooking.

Performance Tips and Real-World Use

While the air fryer is extremely efficient, for best results it’s recommended to rotate or shake food during cooking—especially on the lower levels. This helps achieve even browning and crispiness on all sides. The stacked design allows for more vertical airflow than traditional models, but a little manual intervention can still optimize outcomes.

In practice, users find that this air fryer is ideal for:

• Cooking a full meal (meat + sides) at once

• Batch-prepping for large households

• Reducing the use of ovens and stovetops

• Maintaining tidy kitchen spaces with limited surface area

Ideal for All Lifestyles

Whether you’re a busy parent, a health-conscious cook, or someone who enjoys experimenting with recipes, the Ninja Double Stack adapts to your lifestyle. It’s perfect for:

• Families: Cook larger meals for up to 8 people.

• Meal preppers: Prepare multiple ingredients at once.

• Compact kitchens: Enjoy high capacity without a wide footprint.

• Healthy eaters: Air fry and dehydrate for low-oil, wholesome meals.

Specifications Overview

• Model: SL451UK

• Capacity: 9.5 L total (2 × 4.75 L drawers)

• Functions: Air Fry, Max Crisp, Roast, Bake, Reheat, Dehydrate

• Smart Features: Smart Cook System with Digital Temperature Probe

• SYNC & MATCH Modes: For simultaneous or mirrored cooking

• Power: Approx. 2470 W

• Dimensions: 38.5 cm (H) × 28 cm (W) × 47 cm (D)

• Weight: Approx. 10.3 kg

• Accessories: 2 meal racks, 2 crisper plates, temperature probe

• Cleaning: All accessories are dishwasher safe

• Design: Stacked vertical layout with digital touchscreen

Conclusion

The Ninja Double Stack 9.5 L Air Fryer with Smart Cook System is a clever, compact, and powerful solution for modern cooking. Its stacked design fits beautifully into smaller kitchens while still offering large capacity. The Smart Cook probe adds precision to every dish, while the versatile cooking modes and drawer settings make it incredibly easy to multitask.

Whether you’re cooking for one or a whole family, this air fryer offers a convenient, healthy, and space-saving upgrade to your kitchen routine.