The first and most important aspect in feng shui regarding the stove is its location in the bagua map of your home.
As the stove represents the fire feng shui element, it is best to have it in a location that is compatible with, or is not damaged by its fire energy. Usually South and Southwest are considered ideal feng shui spots for the oven.
You mentioned your stove is in the Northwest. The feng shui element of the Northwest area is metal, which is affected by the fire energy of the oven. In this case it is good to look into some feng shui cures to help you remedy the situation.
The second important feng shui point regarding the stove location and positioning is to have the stove positioned in a way that allows you to have a good view of your kitchen.
Cooking with your back to all the action, so to speak, or with your back to the incoming flow of energy, is not good feng shui.
Cooking in a weak spot or in a weak position is also not good for the quality of the food you cook. You probably do know the food you cook is imbued with your energy.
As for the oven mouth direction, you would see where the actual feeding of the stove, or wires are coming from. For example, if the plugs are on the north wall, that means the feeding energy for the stove comes from the north. It is not an overly important factor, though, and not often used in feng shui, but since you asked, here is the answer.
Feel free to watch our feng shui how-to video tips for further helpful info.
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