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Description
Ninja SL400UK Double Stack XL 2-Drawer 9.5L Air Fryer Grey
Wish you could enjoy the benefits of a double air fryer without sacrificing valuable worktop space? Meet the Ninja Double Stack XL Air Fryer SL400UK, a game-changing kitchen appliance that’s designed to save space while delivering maximum capacity and performance.
This innovative Ninja stacker air fryer features two vertically stacked drawers, making it slimmer than traditional side-by-side models, while still offering all the benefits of a Ninja double stacker air fryer. Whether you’re preparing meals for the family or hosting a dinner party, this Ninja air fryer SL400Uk is your ultimate cooking companion.
Compact Design, Big Capacity
With a height of 38.5cm, the Ninja SL400 double stack fits easily under kitchen cabinets, ensuring your countertops stay clutter-free. Despite its compact design, it boasts a generous 9.5L capacity. Each drawer can hold a 1.4kg roast chicken, making it ideal for feeding up to 8 people – perfect for large families or entertaining guests.
Double Stack Air Fry Technology
Thanks to the Ninja double stack SL400 technology, you can cook on 4 levels simultaneously. The included Stacked Meal racks double your cooking surface, allowing for even crisping across all layers. Each drawer features individual heat sources and rear fans for 360° air circulation, ensuring consistently crispy and evenly cooked results. Whether it’s chicken thighs and asparagus, salmon and potatoes, or a party platter, this air fryer Ninja handles it all with ease.
Independently Controlled Drawers
Mix and match 6 cooking functions, times, and temperatures across two drawers, and let the SYNC feature ensure your food finishes cooking simultaneously. Whether you’re preparing mains and sides, a variety of party snacks, or meals tailored to different dietary needs, this Ninja double stack XL air fryer offers unmatched versatility.
For smaller portions, simply use one drawer, making the Ninja Double Stack XL Air Fryer suitable for any cooking occasion. Each drawer also includes a crisper plate to deliver perfect results every time.
Cook Faster and Save Energy
Cooking up to 55% faster than traditional fan ovens***, the Ninja SL400 double stack XL air fryer gets your meals on the table in record time. Plus, it uses up to 55% less energy†, making it an eco-friendly choice that reduces your energy bills.
6 Cooking Functions
This Ninja air fryer is more than just an air fryer. It offers six versatile cooking functions, including:
- Air Fry: Enjoy healthier meals with up to 75% less fat than traditional frying methods****.
- Roast, Bake, Reheat, Dehydrate, and Max Crisp: From crispy chips to succulent roasts, this appliance has you covered.
User-Friendly and Easy to Clean
The side-positioned control panel makes operation simple, while the non-stick drawers, crisper plates, and racks are dishwasher-safe for effortless cleaning. For added convenience, the built-in timer ensures cooking stops automatically when your food is ready.
The Ninja SL400UK air fryer also includes a chef-created recipe guide to inspire your culinary adventures and help you get the most out of your appliance.
Peace of Mind Guarantee
When you purchase the Ninja Double Stack XL 2-Drawer 9.5L Air Fryer, you’ll enjoy a free 2-year guarantee upon registration with Ninja (UK & ROI only).
Upgrade your cooking game today with the Ninja Double Stack XL Air Fryer SL400UK – the perfect blend of space-saving design, large capacity, and exceptional performance.
Key Benefits
- Studio-quality construction designed for home use
- Smooth, quiet, low-impact resistance training
- Free tracked & insured shipping and 30-day returns
Specifications
- Frame: solid maple wood with stainless steel hardware
- Chair length: 118 cm
- Chair width: 39.5 cm
- Maximum height: 84.5 cm
- Seat length: 47 cm
- Seat width: 39.5 cm
- Seat height: 26 cm
Shipping & Returns
- Free insured shipping
- Secure checkout
- Carefully packed and protected for safe delivery
- Friendly support before and after your purchase
- Returns handled according to Reformora's return policy
Warranty
This reformer is covered by:
• 2-year warranty on the frame
• 1-year warranty on parts
The warranty covers eligible manufacturing defects under normal use. It does not cover damage caused by misuse, incorrect assembly, unauthorized modifications, or normal wear and tear.
Assembly & Care
Light assembly may be required.
For best performance, place the reformer on a flat, stable surface. Wipe the frame, rails, and upholstery with a soft dry or slightly damp cloth after use. Avoid harsh chemicals, excessive moisture, and outdoor storage.
Check springs, ropes, wheels, and hardware regularly to make sure everything remains secure before training.
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Compact Chair. Focused Control.

Why Choose Reformora?
Every piece of Reformora equipment is selected for smooth, quiet operation and stable, supportive construction — built for daily home practice. Each order ships free with tracking and insurance, and is covered by our 30-day return policy.
Designer For Strength, Balance & Control

Smooth Spring Resistance
High-quality springs provide consistent resistance for safe, effective training.

Padded Seat & Backrest
Thick, supportive padding enhances comfort during every movement.

Solid Wood Construction
Premium maple wood frame ensures stability, durability, and timeless appeal.

Versatile Workouts
Perfect for strength, mobility, and rehabilitation exercises.