Introduction
Welcome to the comprehensive instruction manual for your Ninja Double Stack XL Air Fryer. This appliance is designed to provide versatile and efficient cooking, allowing you to prepare a wide variety of meals with less oil. Please read this manual thoroughly before first use to ensure safe and optimal operation.

Figure 1: Front view of the Ninja Double Stack XL Air Fryer, showcasing its vertical design and dual drawers.
Product Components
Your Ninja Double Stack XL Air Fryer comes with the following components:
- Main Unit (Air Fryer Base)
- 2 x 4.75L Cooking Drawers
- 2 x Non-Stick Crisper Plates
- 2 x Stacked Meal Racks
- Instruction Manual (this document)
- Chef Inspired Recipe Guide

Figure 2: Illustration of the main unit with one drawer removed, showing the crisper plate and stacked meal rack. The image highlights the included accessories: two 4.75L drawers, two non-stick crisper plates, two stacked meal racks, and a recipe guide.
Setup
- Unpacking: Carefully remove all packaging materials and promotional labels from the appliance. Ensure all components listed in the "Product Components" section are present.
- Cleaning Before First Use: Wash the cooking drawers, crisper plates, and stacked meal racks in warm, soapy water. Rinse thoroughly and dry completely. Wipe the main unit with a damp cloth.
- Placement: Place the main unit on a clean, dry, level surface. Ensure there is adequate space around the unit for proper ventilation. The compact design allows it to fit under most kitchen cabinets (Height: 38.5cm).

Figure 3: The air fryer positioned on a kitchen counter, demonstrating its space-saving vertical design that allows it to fit conveniently under standard kitchen cabinets.
- Power Connection: Plug the power cord into a grounded electrical outlet. The appliance is rated for 240 Volts and 2470 watts.
Operating Instructions
Control Panel Overview

Figure 4: Close-up view of the air fryer's control panel, showing the digital display for time and temperature, function buttons (Air Fry, Max Crisp, Roast, Bake, Reheat, Dehydrate), and the SYNC and MATCH buttons.
The control panel features a digital display, function buttons, temperature and time controls, and specific buttons for SYNC and MATCH functions.
Cooking Functions
Your Ninja Double Stack XL Air Fryer offers 6 versatile cooking functions:
- Air Fry: For crispy results with little to no oil.
- Max Crisp: Ideal for frozen foods requiring maximum crispness.
- Roast: For tender meats and roasted vegetables.
- Bake: Perfect for cakes, pastries, and other baked goods.
- Reheat: To warm up leftovers without drying them out.
- Dehydrate: For creating dried fruits, vegetables, or jerky.

Figure 5: A collage of six different dishes, illustrating the versatility of the air fryer's functions: crispy fries (Air Fry), garlic bread (Max Crisp), cookies (Bake), roasted chicken and vegetables (Roast), pizza slice (Reheat), and dried apple slices (Dehydrate).
Using the Drawers and Racks
The Ninja Double Stack XL features two independent cooking drawers and two stacked meal racks, allowing for up to four levels of cooking.

Figure 6: The air fryer in use, demonstrating how four different food items (chicken, green beans, fish, and fries) can be cooked simultaneously across the two drawers and their respective stacked meal racks.
To use the stacked meal racks, place them inside the cooking drawers. Ensure food is arranged to allow for proper airflow.

Figure 7: A close-up view of the stacked meal racks, showing how they elevate food within the drawer to create multiple cooking levels, ideal for cooking different components of a meal simultaneously.
SYNC and MATCH Functions
The SYNC and MATCH functions are designed for convenience when cooking multiple items.
- SYNC: Allows you to cook two different foods with different settings in each drawer, ensuring they finish cooking at the same time.

Figure 8: Diagram illustrating the SYNC function, showing salmon fillets in Zone 1 and Brussels sprouts in Zone 2, both set to finish cooking simultaneously despite different cooking requirements.
- MATCH: Applies the same cooking settings (function, temperature, time) to both drawers, ideal for cooking larger quantities of the same food.
Cleaning and Maintenance
Proper cleaning and maintenance will extend the life of your Ninja Double Stack XL Air Fryer.
- Daily Cleaning: After each use, allow the unit to cool completely. Remove the cooking drawers, crisper plates, and stacked meal racks. These parts are dishwasher safe. Alternatively, wash them in warm, soapy water using a non-abrasive sponge. Rinse and dry thoroughly.
- Main Unit: Wipe the exterior of the main unit with a clean, damp cloth. Do not immerse the main unit in water or any other liquid.
- Stubborn Residue: For baked-on food residue, soak the drawers and plates in warm, soapy water for 10-15 minutes before cleaning.
- Storage: Ensure all parts are clean and dry before storing the appliance. Store it in a cool, dry place.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Appliance not turning on. | Power cord not securely plugged in. | Ensure the power cord is firmly plugged into a grounded electrical outlet. |
| Food not cooking evenly. | Overcrowding the drawers; food not shaken or flipped. | Do not overcrowd drawers. Shake or flip food halfway through cooking for even results. Use the stacked meal racks to optimize space without overcrowding. |
| White smoke coming from unit. | Grease or food residue in the drawer or on the crisper plate. | Clean the drawers and crisper plates thoroughly after each use. Ensure no excess oil or food debris remains. |
| Food not crispy. | Too much moisture in food; not enough oil (for certain foods); temperature too low. | Pat food dry before air frying. A light coating of oil can help. Increase temperature if necessary, following recipe guidelines. |
Technical Specifications
- Model Number: SL400UK
- Capacity: 9.5 Litres (2 x 4.75L Drawers)
- Power: 2470 Watts
- Voltage: 240 Volts
- Dimensions (H x W x D): 38.5 cm x 28 cm x 47 cm
- Weight: 10.3 kg
- Material: Plastic, Aluminium
- Functions: Air Fry, Max Crisp, Roast, Bake, Reheat, Dehydrate

Figure 9: The air fryer shown alongside various cooked dishes, including a whole roasted chicken, fries, and vegetables, illustrating its 9.5L capacity which is sufficient to feed up to 8 people.
Warranty and Support
Your Ninja Double Stack XL Air Fryer comes with a standard warranty. Please refer to the warranty card included in your packaging for specific terms and conditions.
Warranty Registration: Register your product with Ninja to activate your warranty and receive additional support. A free 2-year guarantee is available upon registration with Ninja (UK & ROI only).
Customer Support: For any questions, troubleshooting assistance, or to order replacement parts, please contact Ninja customer support. Visit the official Ninja website for contact information and FAQs.
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