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Broan ALT4 Series 30 in. Convertible Standard Style Range Hood with 640 CFM, 3 Fan Speeds & 2 LED Lights - Stainless Steel

MODEL:

ALT4306SS
5 out of 5 Customer Rating
Broan ALT4 Series 30 in. Convertible Standard Style Range Hood with 640 CFM, 3 Fan Speeds & 2 LED Lights - Stainless Steel is rated 4.7 out of 5 by 18.
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About this Item

Broan Alta 303 Under-Cabinet Range Hood, Stainless Steel (Model ALT4306SS)

Overview:
SmartSense Automated Ventilation

Infrared sensor detects heat from the cooktop and automatically adjusts fan speed to clear smoke and odors effortlessly.

Most Powerful Under-Cabinet

Delivers up to 640 CFM---exceptional airflow for heavy cooking needs.

EZ1 Install System

One-person installation with included brackets, cutting install time in half.

ENERGY STAR & Title 24 Compliant

Certified energy-efficient performance with dual-level LED lighting and dishwasher-safe hybrid baffle filters.

PDF Icon Installation Instructions
PDF Icon Owners Manual
PDF Icon Specifications Sheet
Product Height
5.12 Inches
Product Width
30 Inches
Product Depth
20.06 Inches
Product Weight (lbs.)
-
Mounting Height (in.)
30 in. Above Cooktop
Distance Over Cooking Surface (in.)
30 Inches
Duct Size (in.)
10
Minimum Round Duct Size (in.)
7
Color
Stainless Steel
Hood Width (in.)
30
Type
Hood
Style
Standard
Mounting Type
Undercabinet
Vent Type
Convertible
Exhaust Power (CFM)
640 CFM
Blower Type
Internal
Duct Direction
Vertical or Horizontal
Duct Type
Rectangular or Round
Sound Level (Sones)
8.5
Noise Level (dB)
-
Light Type
LED
Number of Lights
2
Light Levels
2
Number of Fan Speeds
3 Fan Speeds
Glass Canopy
No
Removable Grease Filter
Yes
Stainless Steel Baffle Filter(s)
-
Dishwasher Safe Filters
Yes
Fingerprint Resistant
No
Series
ALT4 Series
Additional Features
E Star, LED lights , 640CFM Code Ready to 400 or 300
WiFi Connected
No
Smart Features
-
Works with
-
Control Type
Digital
Backlit LED Knobs
No
Fan Speed Controls
Yes
Boost Mode
No
Heat Sensor
No
Delay Shut-Off
Yes
Voltage (V)
120 Volts
Amperage (A)
2
Approved for Commercial Use
No
Approved for Outdoor Use
No
Charcoal Filter Included
No
Exhaust Blower Included
Yes
Damper Included
-
Smart Accessory Required
No
Remote Control Included
No
ADA Compliant
Yes
ANSI Certified
-
CSA Listed
No
ETL Listed
Yes
NSF Listed
No
UL Listed
No
CEE Rating
No
HVI Certified
Yes
Energy Star Rated
No
Warranty Terms - Parts
12 Month(s)
Warranty Terms - Labor
12 Month(s)
Rated 5 out of 5 by from Improve your cooking area! [This review was collected as part of a promotion.] This thing is amazing. I had to take out an over the range microwave to install it so excuse the surroundings. The lighting difference is amazing even on the low setting. The fan will pull any fumes away and watch out on the highest setting. It sounds like it's going to take off. I can't wait to put it to the test.
Date published: 2026-01-05
Rated 5 out of 5 by from Pretty blue [This review was collected as part of a promotion.] Ok this is super great!! Strong winds and helps keep the smoke and steam out! Kind of heavy. The blue is really pretty! Easy to clean. Def. Worth it !
Date published: 2026-01-03
Rated 5 out of 5 by from Ventilation is excellent [This review was collected as part of a promotion.] This range hood has been a nice addition to our home. Simple efficient and easy to install. It has been easy to clean, the exhaust has done an excellent job pulling the smoke out when you accidentally leave your grease on too long.
Date published: 2025-11-30
Rated 5 out of 5 by from Stylish and effective [This review was collected as part of a promotion.] I received this Broan stainless steel range hood from Influenster in exchange for my honest review. Overall, I’m really pleased with it. The design is sleek and modern, and it instantly upgraded the look of my kitchen. The stainless steel finish is easy to wipe clean and looks great with other appliances. Performance-wise, it does a solid job removing smoke and cooking odors. The fan has multiple settings, and even on the higher ones, the noise level is reasonable. The lighting is bright and actually useful when cooking—definitely brighter than the hood I had before. Installation was pretty straightforward as well. The one thing I noticed is that the suction isn’t extremely powerful, but for everyday cooking, it works just fine. It’s not a heavy-duty professional hood, but it gets the job done and looks beautiful doing it. Overall, this is a great, affordable range hood that performs well and adds a clean, upgraded look to the kitchen.
Date published: 2025-11-14
Rated 5 out of 5 by from Looks Great, Works Better [This review was collected as part of a promotion.] This range hood is amazing. Me and my fiancé bought a house last year, without a range hood, and installed this ourselves. It was really easy to do and works absolutely amazing. It looks so sleek and aesthetically pleasing. It has several different fan function (light, medium, strong), two different light settings, and my personal favorite an auto setting which is exactly what it sounds like- it will automatically turn on and set itself to whatever is needed. We don’t have any exhaust venting leading outside so we are using charcoal filters which we’re pretty easy to find based on the manual. Overall I’m really impressed and would recommend this to everyone! Looks amazing, works even better, 10/10.
Date published: 2025-11-12
Rated 5 out of 5 by from Gorgeous! [This review was collected as part of a promotion.] Wow! This was way easier to install than I thought. It fit perfectly into my cabinet space, so their measurement is accurate. The build is high quality and does a great job and ventilating the area. The design is beautiful and functionally. It’s very easy to use and matches well with my stovetop!
Date published: 2025-11-11
Rated 5 out of 5 by from This has saved my cabinets! [This review was collected as part of a promotion.] We moved into an old farm house. While I adore the classic charm, it was missing a hood fan. This thing is a life saver for my cabinets! No more stream ruining my cabinet finish. No more humid kitchen while cooking! Easy to install, look beautiful and works amazing!
Date published: 2025-11-11
Rated 5 out of 5 by from Love [This review was collected as part of a promotion.] This hood range is quiet. Easy to clean, has good airflow, the designers cute and easy to use and install. Its sturdy and just overall works and looks amazing. Highly recommend. Its easy to clean and great to have.
Date published: 2025-11-08
Rated 5 out of 5 by from Easy to install, user, efficient and gorgeous [This review was collected as part of a promotion.] I am beyond thrilled with this Broan range hood! We have a cottage ‘up north’ as they say here in Wisconsin that we are renovating but by bit. And because it is ‘up north’ we have to do a lot ourselves and sometimes ‘parts’ don’t show up when they are supposed to, hence mounting the hood on brackets because the new cabinets are somewhere on a boat. In any case this will work until the cabinets arrive. It came securely packed in styrofoam in a box with easy to follow directions. DH was thrilled with how heavy a gauge the stainless steel housing was fabricated from and the size of the two fans and motors. He was also happy about the 3 venting options: a round duct out the top, a flat duct out the top of filtering through a filter and venting the clean air through the top. Because our cabinets re not here yet, and I am anxious to use it we used the filter option, but will use the round duct option through our cabinet when it arrives. He made some measurements, drilled some holes and mounted the hood and plugged it in. To show how well it works I boiled some water, and both used the automatic on function and manual function. The auto function is automatic- the fan turns itself on when it senses a change in temperature- and it really does! Multiple fan speed levels suck that steam right up! And there are several light levels. I was surprised with how quiet it was considering I had it cranked and those brackets are not super sturdy. There no vibration at all. We did not utilize (and won’t because this cottage is def not energy efficient) but you can override some of the settings to ensure that you are sucking out more air than energy codes permit) I fried some fish later that evening and the optional charcoal filters did an impressive job of grabbing and holding those nasty fish odors. I can hardly wait for my cabinets and the permanent installation.
Date published: 2025-11-03
Rated 5 out of 5 by from Quiet fan [This review was collected as part of a promotion.] Very attractive stainless steel hood vent that looks great with my new white kitchen cabinets and stainless steel appliances. The fan is very quiet on the low settings which I am very happy about. It’s easy to clean with a stainless steel liquid cleaner. Overall great quality.
Date published: 2025-10-22
Rated 5 out of 5 by from Massive upgrade to my kitchen!! [This review was collected as part of a promotion.] I haven’t needed to buy a hood vent in a long time and man have things changed! Installation was a breeze! I had to move my wiring through the wall a bit but it wasn’t the fault of the new unit. The automatic function is awesome! It can get a bit loud on high due to the dual fans. But it moves some air! I turned it on an opened a window and it created a breeze! The other modes are relatively quiet. I cannot say enough good things!
Date published: 2025-10-15
Rated 5 out of 5 by from Good stuff [This review was collected as part of a promotion.] It’s work very well and don’t make to noise. The design make good. Easy to install and airflow works better than I have one before. I will recommend for my family and my friends.
Date published: 2025-10-07
Rated 5 out of 5 by from Sleek, powerful, and easy to install! [This review was collected as part of a promotion.] I’m in love! The Broan ALT4306SS is a standout under cabinet range hood that truly delivers. Its 640 Max Blower CFM airflow power handles even heavy cooking without sweat. Installation was smooth with the EZ1 system, easy for one person. The SmartSense feature adapts ventilation based on heat, which makes it ideal for everyday use without fuss. Its sleek stainless steel design fits cleanly into the kitchen aesthetic and doesn’t draw unnecessary attention. Overall, this hood handles performance and style with ease.
Date published: 2025-10-02
Rated 5 out of 5 by from Nice design with idea controls for minimal fingerp [This review was collected as part of a promotion.] Excellent design and quality product. Big fan of the ability to activate the buttons without having to fully touch them so helps avoid the common issue of fingerprints on your stainless products. The 2 phase light is idea for folks that also tend to leave the over stove light on as a kitchen soft lighting. The exhaust fan draw is very nice. Was nice to have multiple ways to mount the unit as well. Nice design!
Date published: 2025-10-02
Rated 5 out of 5 by from Great design Ease to put up [This review was collected as part of a promotion.] From the leader in residential indoor air quality, this under-cabinet range hood by Broan-NuTone is built to surpass industry standards with over 50 points of inspection, engineered as a reliable ventilation solution. The durable hood vent is equipped with SmartSense Auto Operation that automatically monitors and adjusts the ventilation power needed based on heat coming off the cooktop to maitain the intregity of the IAQ in your space. The Alta range hood is also up to 71% quieter: 1.1 sone is equivalent to a refrigerator running, so it won't interfere with daily life. The EZ1 Install System allows for a quick and easy 1-person installation, and the ENERGY STAR Certification is both code compliant and provides cost savings. Code Ready Technology (CRT) provides capability to reduce the 490 Max Blower CFM down to 300 or 400 CFM to meet local code requirements, and the 2-Level LED lighting modules and a 3-Speed whisper touch infrared control make cooking a breeze.
Date published: 2025-09-22
Rated 4 out of 5 by from Good product for price! [This review was collected as part of a promotion.] I had no issues installing this range hood in my kitchen. Noise is minimal, but enough to notice in background and I turn off immediately when done using. It does a great job getting steam and smoke out of area when cooking.
Date published: 2025-12-09
Rated 4 out of 5 by from Powerful and quiet range hood [This review was collected as part of a promotion.] This range has changed the cooking game! No more smell! Excellent suction power and also super quiet comparing to my old one. Very sleek and clean design. Love that it senses and adjust the suction power to the way I cook. Installation was super easy for me because I had an existing hood. But it’s pretty easy to install. But i do suggest them to redo the drawings for the installation. It is quite difficult to understand the measurement and it is very confusing. I had my brother in law look at the instruction and even for a mechanical engineer he was like this will not fly with his machinist. So I recommend someone at Broan needs to go over the diagram and make it easier to read. Especially in the measurements and diagram does not make sense at all. Thank you Broan and Influenster for providing this free item to review!
Date published: 2025-10-10
Rated 2 out of 5 by from Nice vent [This review was collected as part of a promotion.] Just got it and can't put up yet as still in the process of putting in the kitchen it looks great in the box. Not sure how everything else will go but will update soon
Date published: 2025-10-03
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