Stacking its dual drawers on top of each other, the Ninja Double Stack XL 9.5L Air Fryer SL400UK offers a staggering 9.5 litres of cooking space squeezed into a device that only takes up the same counter space as a singe-zone air fryer. New to this model is dual-layer cooking, so you can cook four different things at once, with the slight caveat that it can be fiddly to turn food during cooking. That minor issue aside, brilliant results
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