In a convection microwave oven, there is a fan that blows hot air to ensure heat is dispensed evenly. Conventional Ovens Almost all American kitchens have modern conventional ovens. This is in fact the most common type of oven for household use and it is utilized by most Americans not just to heat but also to cook their meals, desserts, and other types of food. The mechanisms are much advantageous particularly the features in which this type of microwave oven is integrated with. One of the features of this microwave oven is its ability to cook multiple delicacies. Roasting chicken, browning sandwiches, baking rolls and pastries, cooking pasta and pizzas, steaming fish, this microwave is very functional. Not only would you be able to reheat or defrost your food, but you can also do some baking and cooking with it. It's like having two cooking appliances in the price of one. The difference lies in the way both of the ovens are built. Convection microwaves have built-in fans at their backs, which unfortunately, conventional ones lack of. Also, the chemical reactions that are produced inside the microwave when radiation is emitted can form carcinogens, which are chemicals known as one of the causes of human cancer. Logically thinking, it may not indeed be impossible that the fears of danger in using microwave appliances have basis especially when you would think of the methods that were basically been doing by the people. There are compact microwaves, medium capacity microwaves, and large capacity microwaves. Compact units are usually less than 18 inches wide, 14 inches deep, and 12 inches tall and their capacity is less than one cubic foot. The wattage of such units ranges from 500 to 1000 watts. Medium capacity microwaves come with a width of 20 inches or more and with capacities of 1 1.5 cubic feet. The reason for this is that the third party supplier might not have some microwave replacement parts you need and which can only be found at the manufacturer's website. If you can't go to the local stores to purchase replacement parts, online websites are your best option. Aside from the fact that they are available 24 hours a day, they usually have quality replacements parts too.