If you have an electric cooktop, range hoods should typically be 20–24 inches above the heat source. For gas cooktops, your range hood should be around 24–30 inches above the stove. Range hoods are a great way to complement your cooktop or range and can help clear the air while you cook.
A 30-inch hood over a 36-inch cooktop is not recommended, as it may not effectively capture smoke and odors. For proper ventilation, the hood should be at least 36 inches wide.
Ventilation to the Outdoors (IRC M1503. 1): Residential range hoods should vent to the outside to effectively expel smoke, grease, and cooking odors, maintaining the home's air quality. This requirement is crucial for preventing the recirculation of contaminants within the home.
At a minimum, the hood should extend to about the middle of the front burners. Under-cabinet range hoods are not as deep as wall or island models. A range hood should not extend beyond the outer edge of the cooktop.
A wood style island range hood should have at least 36” clearance from the cooktop, while a stainless steel range hood will require a 30” clearance.
If you have an electric cooktop, range hoods should typically be 20–24 inches above the heat source. For gas cooktops, your range hood should be around 24–30 inches above the stove. Range hoods are a great way to complement your cooktop or range and can help clear the air while you cook.
Right distance gas cooktop
The minimum distance between your gas cooktop and range hood is 65cm. This is to ensure your safety because of the gas and fire.
In general, most installations require a distance from 20" to 24" between the bottom of the hood and the cooking surface. Over a gas range, this distance should be between 24" and 30", unless otherwise specified.
STANDARD RANGE HOOD DEPTH
Your range hood should be deep enough to cover all rear and front burners to most effectively vent your cooking space. For most range hoods, you can plan on a depth of about 18 inches to 22 inches for full coverage.
As a general rule, look for 100 CFM for every linear foot of cooking surface. For pro-style ranges, the formula is 100 CFM for every 10,000 BTUs your appliance puts out. Other factors come into play as well. For every 3 inches a hood exceeds the suggested height above the cooktop, add 100 CFM.
Using flexible duct for a range hood is generally not recommended. Range hoods are designed to effectively remove smoke, odors, and grease particles from the cooking area, and using the right type of ducting is crucial for optimal performance and safety.
Your range hood duct should not exceed 30' for a straight run, 25' for a run with one elbow, and 20' for a run with two elbows. The shorter the duct, the better. If your ductwork is too long, your kitchen air may not reach the outside.
The thumb rule is to select a hood 3 inches wider than the cooktop on both sides. The ideal hood size for a 30-inch cooktop would be a 36-inch range hood.
Upgrading to a 36-inch cooktop may be achievable in any kitchen with enough space, but be aware that some renovations to your cabinetry may be necessary beforehand. Walk through a step-by-step overview for installing a new cooktop below, or find a more detailed explanation of the process with this guide.
Conclusion. The size of an ideal hood range should be slightly wider than your cooktop for optimal performance. So, for example, a 30-inch stove top will need a hood range between 36-42 inches wide. A larger hood range is required for outdoor stoves, ceiling mount ranges for island cooktops, and gas stoves.
The standard height for a range hood is between 28 and 36 inches from the cooktop for a gas range and electric range. 28 inches is the minimum height. If the hood is any closer, it may become damaged. Any further than 36 inches and your hood won't move air away from your cooktop efficiently.
NEVER use 4" dryer duct or any plastic duct on a range hood installation. The minimum size duct allowed on most range hoods is 3 ¼" by 10" which is equivalent to 6" round.
For most home kitchens, a 400 CFM range hood suffices. But if your cooking involves high heat or your stove has a high BTU output, consider a higher CFM.
For all domestic cooking appliance installations in new builds and kitchen replacements / renovations, the clearance from the top of the cooking vessel supports (trivets) to the underside of the rangehood require to have a minimum clearance of 650mm.
Such hoods shall be installed with a clearance of not less than 1/4 inch (6.4 mm) between the hood and the underside of combustible material and cabinets. A clearance of not less than 24 inches (610 mm) shall be maintained between the cooking surface and combustible material and cabinets.
If you have an electric cooktop, range hoods should be 20–24 inches above the heat source. For gas cooktops, your range hood should be 24–30 inches above the stove. Range hoods have multiple functions such as complementing your cooktop or range and helping clear the air of smoke while you cook.
It should be centered above your cooktop or range, and positioned at a height that allows for effective ventilation. We recommend leaving 24 to 30 inches of space above an electric stove top. For a gas range, you'll need 30 inches.
Your range hood should extend to cover all back burners and front burners on your cooking station. For most range hoods, 18-22 inches is deep enough for full coverage. However, downdraft vents are slightly larger and require at least 24 inches of depth.
A good rule of thumb is to choose a range hood that's 6 inches wider than your cooktop on both sides. That means if your cooktop is 24 inches wide, your range hood should be 36 inches wide to cover the 24 inches of cooktop space and 6 extra inches on each side.