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But every gas- and oil-burning furnace must have one ... which typically consists of an array of metal tubes. Hot air from the primary exchanger cools and condenses when it enters the tubes ...

The almighty air fryer ushered ... and a spritz of oil. Crinkle-cut, shoestring, waffle, curly -- whatever your favorite shape is -- they all come out divinely crispy and hot when you follow ...

Compared with deep-fat fryers, air fryers are a more healthy way to cook as they use hot air and less cooking oil – or sometimes no oil at all. Instead, air fryers blast hot air around a small cooking ...