Broan ALT4306SS Alta 30 inch Under Cabinet Range Hood with 640 CFM, SmartSense Automated Ventilation, ENERGY STAR Certified and Code Ready Technology in Stainless Steel

Alta 30-Inch 640 MAX Blower CFM Range Hood

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 maintain the integrity of the IAQ in your space. This is the most powerful under-cabinet in our assortment at 640 Max Blower CFM, and the EZ1 Install System allows for a quick and easy 1-person installation. This ENERGY STAR Certified unit is code compliant and provides cost savings, and the 2-Level LED lighting modules and a 3-Speed whisper touch infrared control make cooking a breeze.  At Broan-NuTone we believe that better quality of air means better quality of life.

• 50 Points of Inspection: Expect a durable, long-standing ventilation solution engineered by the leader in indoor air quality
• SmartSense™ Automated Ventilation: Expel pollutants from your home without thought or action; An infrared sensor monitors for heat coming off the range and will automatically adjust the hood's fan speed as needed to eliminate smoke and odors while cooking
• Most Powerful Under-Cabinet: At 640 Max Blower CFM, this is the strongest vent hood in our under-cabinet line up, providing the power needed to handle heavy cooking and clear pollutants from the home.
• One Person Installation: With the included EZ1 brackets it's an easy install for a single person in half the time, both professional and DiYers
• Both ENERGY STAR certified and Title 24 compliant, this kitchen hood is energy efficient and code compliant
• Code Ready Technology (CRT): Supports the installer's job with the ability to reduce airflow to 300 or 400 CFM to address local codes or make-up air requirements
• Bright 2-level, heat resistant LED modules (included) to enhance your cooking experience
• Easy-to-clean, fully enclosed bottom with 2 dishwasher-safe high efficiency hybrid baffle filters
• The infrared controls allow for manual operation to adjust the 3-speed blower  and 2 level lighting
• Convertible to accommodate either top or rear venting applications or non-ducted operation using charcoal filters, which are sold separately (Filter Model HPF30)
• Range hood is installed as hardwired or with an optional power cord kit (HCK44; sold separately)
• Can be used with optional Universal make-up air damper MD6TU, MD8TU or MD10TU to replace air exhausted out of the house only when the hood is turned ON, helping with ventilation to keep your home fresh while reducing energy consumption

• Can be installed for ADA Compliance with the purchase of model HAWRK5 low voltage wiring and wall switch kit

Why Buy Broan ALT4306SS Alta 30-Inch 640 MAX Blower CFM Range Hood

• 640 Max Blower CFM Power: One of Broan-NuTone’s most powerful under-cabinet hoods, designed to efficiently remove smoke, grease, heat, and cooking odors during heavy cooking.
• SmartSense™ Auto Operation: Built-in infrared sensors automatically adjust fan speed based on heat from the cooktop, helping maintain indoor air quality without constant manual adjustments.
• Quiet Performance: Rated as low as 0.8 sones, it delivers strong ventilation while remaining quieter than many high-powered range hoods.
• ENERGY STAR Certified: Energy-efficient design helps reduce power consumption while remaining compliant with modern ventilation standards and Title 24 requirements.
• Easy One-Person Installation: EZ1 installation brackets simplify setup for homeowners and professionals alike, reducing installation time.
• Flexible Venting Options: Supports top or rear ducted venting and can also convert to ductless operation with optional charcoal filters.
• Easy Maintenance: Dishwasher-safe hybrid baffle filters and a fully enclosed bottom make cleaning easier and help maintain long-term performance.

• Bright LED Lighting: Integrated 2-level LED modules improve cooktop visibility while remaining energy efficient.

Frequently Asked Questions

Q: What is the ALT4306SS?

A: The ALT4306SS is a 30-inch under-cabinet range hood from the Broan-NuTone Alta 4 Series, designed to remove smoke, grease, heat, and cooking odors from residential kitchens.

Q: What is the airflow (CFM) rating?

A: The ALT4306SS provides up to 640 MAX Blower CFM, making it one of the most powerful under-cabinet hoods in Broan’s lineup.

Q: How many fan speeds does it have?

A: The hood features a 3-speed blower control system with infrared touch controls for adjusting ventilation levels.

Q: What makes the ALT4306SS unique?

A: Key features include:

• SmartSense™ automatic ventilation
• Quiet operation at low sones
• ENERGY STAR® certification
• EZ1 one-person installation system
• Infrared touch controls
• LED lighting modules

Q: What is SmartSense™ Auto Operation?

A: SmartSense™ technology uses an infrared sensor to detect heat from the cooktop and automatically adjusts fan speed to improve indoor air quality while cooking.

Q: Is the ALT4306SS ENERGY STAR certified?

A: Yes. The hood is ENERGY STAR® certified and designed to meet Title 24 energy compliance standards.

Q: Is the hood ducted or ductless?

A: The ALT4306SS is convertible, meaning it supports:

• Top venting
• Rear venting
• Non-ducted recirculating installation with optional charcoal filters

Q: What filters does it use?

A: It uses dishwasher-safe hybrid baffle filters designed for grease capture and easy cleaning. Optional charcoal filters are available for ductless operation.

Q: What type of lighting does it include?

A: The hood includes 2-level heat-resistant LED lighting modules to illuminate the cooktop area.

Q: How quiet is the ALT4306SS?

A: It operates as low as 0.8 sones at lower settings, providing relatively quiet ventilation performance.

Q: Can the airflow be adjusted for local code requirements?

A: Yes. The hood includes Code Ready Technology™ (CRT), allowing installers to reduce airflow to 300 or 400 CFM where local make-up air codes apply.

Pros and Cons of Broan ALT4306SS Alta 30-Inch 640 MAX Blower CFM Range Hood

Pros

• 640 Max Blower CFM Power: One of Broan-NuTone’s most powerful under-cabinet range hoods, capable of handling heavy cooking, smoke, grease, and strong odors effectively.
• SmartSense™ Automatic Ventilation: Infrared sensors automatically adjust fan speed based on heat from the cooktop, helping maintain indoor air quality with minimal user input.
• Quiet Operation for Its Power Level: Rated as low as 0.8 sones, offering quieter performance than many high-CFM range hoods.
• ENERGY STAR Certified: Energy-efficient operation helps reduce power usage while meeting modern code requirements including Title 24 compliance.
• Easy One-Person Installation: EZ1 brackets simplify installation for both professionals and DIY homeowners.
• Flexible Venting Options: Supports top or rear venting and can convert to ductless operation with optional charcoal filters.
• Easy Maintenance: Dishwasher-safe hybrid baffle filters and fully enclosed bottom design simplify cleaning and long-term upkeep.
• Bright LED Lighting: Integrated 2-level LED modules improve visibility while cooking and remain energy efficient.

Cons

• Higher Cost Than Basic Hoods: Premium airflow, automation, and energy-efficient features increase price compared to standard under-cabinet range hoods.
• Potential Make-Up Air Requirements: Higher airflow systems above certain CFM thresholds may require additional make-up air systems depending on local building codes.
• Touch/Infrared Controls May Not Appeal to Everyone: Some users prefer traditional physical buttons for long-term reliability and easier use with wet hands.
• Replacement Parts Can Be Expensive: Some Broan owners report blower replacement assemblies can be costly outside warranty coverage.
• Still Noticeable at Maximum Power: Despite quiet low-speed operation, noise increases significantly at the highest fan settings due to the strong airflow.

Conclusion

The Broan Alta ALT4306SS is an excellent choice for homeowners who want a powerful, smart, and energy-efficient under-cabinet range hood with advanced automatic ventilation features and quiet everyday performance. It stands out for its strong 640 Max CFM airflow, SmartSense automation, and easy installation system, making it ideal for serious home cooks and modern kitchens. However, buyers should consider the higher price, possible make-up air requirements, and more advanced electronic controls before purchasing.