How big is the 26QT interior in practical terms?

26 quarts is large for a countertop oven. It holds a whole chicken, a 9x13 pan or several slices of toast at once, which is more than most air fryer toaster ovens offer.

Do the French doors make it easier to use?

Yes for access. Both doors swing open so you can reach the racks from the front without sliding a hot tray out. The trade-off is that it needs clear space on both sides and more counter depth.

What do the 7 preset menus cover?

The presets set time and temperature for common foods across the seven functions: air fry, bake, roast, grill, toast, dehydrate and defrost. You can still set temperature and time manually.

Can it replace a standalone air fryer?

Largely yes. The 1700W convection fan crisps food much like a basket air fryer, and the larger capacity means you can cook more at once, though basket fryers heat up faster for small batches.

Does it need special clearance or ventilation?

Treat it like any large countertop oven: leave room above and on both sides for heat to escape, and keep it away from cabinets and curtains. The French doors also need swing room.