It depends on the size of the range or cooktop that you have. Generally, range hoods should have at least 100 cfm for every 10-12 inches in width of your range. For example, if you have a 30-inch wide range/cooktop, then you should look for a range hood with at least 300 cfm.
It is also important to consider the height of your range hood and the type of cooking you will be doing. For lower profile hoods (under 30-inches tall) or cooking that involves a lot of grease and steam, you may want to look for a range hood with more than the minimum of 100 cfm per 10-12 inches.
Additionally, it is recommended to choose a stronger range hood if your cooktop is next to a wall or other surface that could cause obstructions.
Is 300 CFM or 400 CFM better?
It depends on what you are looking to accomplish. Generally speaking, a 400 CFM fan is stronger and more powerful than a 300 CFM fan, meaning it can more effectively move air and cover a larger area.
However, this also means that a 400 CFM fan is noisier and less energy efficient. If you are looking for a more energy-efficient solution, then a 300 CFM fan might be a better option. Additionally, if the fan is being used in a smaller space or if it’s being used in a space where noise levels are an issue, then a 300 CFM fan may be the better choice.
Ultimately, the decision of which fan is better comes down to personal preference and the specific needs of the space.
Is 700 CFM enough for range hood?
It depends on what type of range hood you are using. 700 CFM may be enough for a range hood over a small stove, but larger stoves may need more CFM to effectively vent out the smoke and steam from cooking.
Additionally, the size of your kitchen and how often you cook will also affect how many CFM you need. A larger kitchen may need a range hood with a higher CFM rating to help provide adequate ventilation, while a kitchen used for lighter cooking may be able to get away with a hood with a lower CFM rating.
The best way to determine how much CFM you need is to consult with a professional who can assess your ventilation and cooking needs.
Does a 400 CFM range hood need make up air?
Yes, a 400 CFM range hood does need make up air. Make up air is necessary when using any type of ventilation system as it helps to equalize the air pressure in the home. Without make up air, the outdoor air pressure can cause the exhaust air from the range hood to be drawn back into the home in undesirable conditions (such as during a cold winter day when the outdoor air is much colder than the indoor air).
Additionally, without make up air, the range hood exhaust will not be able to perform as designed, as all of the air it removes from the home must be replaced with fresh, outdoor air. To ensure optimal performance of your 400 CFM range hood, make up air should be provided by opening a window, installing a dedicated make-up air system, or using some other method.
How many CFM do I need for a gas range?
The amount of CFM (Cubic Feet per Minute) required for your gas range depends on several factors, including the BTU (British Thermal Units) rating of your burner, the size of the area surrounding the appliance, the type of fuel being used, and the ventilation method being utilized.
Generally, burners on a residential gas range range from 5,000 BTU to 20,000 BTU, with most being higher end at around 17,000 BTU. In closed kitchens with no windows, a minimum of 100 CFM (per burner) is required for proper ventilation.
Wall mount hoods typically need 200 CFM for every 10,000 BTUs, and the air flow should be dispersed evenly over the cooktop. Since ranges and cooktops vary in BTU, the specific CFM rating required for each appliance may differ.
It is recommended to consult a professional HVAC technician to confirm the appropriate amount of CFM needed for your gas range so that you can ensure the proper ventilation.