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Steps to Make an Exhaust
Hood Extension
A hood extension typically refers to extending a kitchen exhaust hood or ventilation system to accommodate a change in layout or new appliances. This project involves construction, mechanical work, and adherence to local codes. Here’s an overview of what needs to be done:
- Design the Hood Extension
- Work with a kitchen designer, contractor, or engineer to design the hood extension that aligns with your kitchen layout.
- Choose a hood model or customize one that matches the increased ventilation requirements for your cooking appliances.
- Secure required building and mechanical permits from your local authority. This step ensures the extension meets safety and zoning standards.
- Engage a licensed contractor, mechanical engineer, or HVAC specialist for the installation. Depending on the scope, you may need:
- An electrician (for wiring and lighting).
- A plumber (if connected to gas appliances).
- A carpenter (for structural modifications).
5. Inspection and Final Approval
- Schedule an inspection by your local building authority to confirm compliance with all codes.
- Obtain a Certificate of Occupancy or a final sign-off if required.
- Regularly clean and maintain the hood, filters, and ductwork to ensure efficient operation and compliance with safety standards.
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Standard Widths and Depths of Exhaust Hoods
Hoods are typically sized to match or exceed the dimensions of the kitchen equipment beneath them:
Widths:
Height and Clearance Requirements
Duct Size and Airflow: Proper duct sizing (e.g., diameter of 8–12 inches or more for larger systems) ensures the balance between airflow and equipment needs.
Hoods are typically sized to match or exceed the dimensions of the kitchen equipment beneath them:
Widths:
- Common widths: 4 feet, 6 feet, 8 feet, 10 feet, 12 feet, and larger in custom configurations.
- The hood should extend at least 6 to 12 inches on each side beyond the width of the equipment on all sides for proper capture of smoke and grease.
- Common depths: 4 feet to 6 feet, depending on the hood type and kitchen design.
Height and Clearance Requirements
- Installation Height Above Cooking Equipment: Typically, the installation height is 24 to 30 inches above standard cooking equipment, such as ranges, fryers, and griddles. For larger equipment, the height may increase up to 36 inches to ensure proper clearance.
- Minimum Ceiling Clearance: Maintain a minimum of 18 inches clearance between the top of the hood and combustible materials (or as specified by local codes).
- The height of the hood above the floor (from the bottom edge) should typically range between 78–84 inches to ensure ergonomic usability and compliance with codes.
Duct Size and Airflow: Proper duct sizing (e.g., diameter of 8–12 inches or more for larger systems) ensures the balance between airflow and equipment needs.
When Is Filing Not Required?
- Minor modifications, such as replacing filters or cleaning ducts, typically do not require filing.
- However, any structural, mechanical, or fire system change usually mandates a permit.
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Permits You May Need
a. Building Permit
b. Mechanical Permit
c. Fire Suppression Permit
d. Electrical Permit
e. Health Department Approval.
Filing Process
a. Building Permit
b. Mechanical Permit
c. Fire Suppression Permit
d. Electrical Permit
e. Health Department Approval.
Filing Process
- Submit Plans: A licensed contractor, architect, or engineer must submit detailed plans to your local building department. These plans typically include:
- Hood dimensions.
- Ductwork layout and specifications.
- Ventilation and airflow calculations.
- Fire suppression system details.
- Pay Fees: Filing fees vary based on the project’s scope and location.
Mary Shafran | EXPERIENCE DESIGN
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