Broan ALT4 Series 30 in. Convertible Standard Style Range Hood with 640 CFM, 3 Fan Speeds & 2 LED Lights - Stainless Steel
Key Features
- Dimensions (in.) (WxHxD): 30.0(w) X 5.1(h) X 20.0(d)
- Duct Size (in.): 10
- Exhaust Power (CFM): 640
- Mounting Type: Undercabinet
- Vent Type: Convertible
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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
$634.98
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.


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
Dishwasher Safe Filters
Yes
Fingerprint Resistant
No
Series
ALT4 Series
Additional Features
E Star, LED lights , 640CFM Code Ready to 400 or 300
Stainless Steel Baffle Filter(s)
-
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
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
daisyg62db_3419 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
daniels467_7486 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
vuit_5176 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
lesterl1_8061 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
nateneedham81_1587 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
anthonyp42_7332 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
tomt35_9594 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
searraw_1193 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
