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Heating Ventilation and Air Conditioning Full Course - HVAC Course (Part 17)

Mohammed Furkhan June 07, 2022


                 This is part 17th of the full HVAC course. You can access all the previous parts by the end of this post. This part is the continuation of kitchen ventilation. In this part, we will learn about kitchen hoods in kitchen ventilation.

The reason I make this post is that there are many people who are unaware of the importance of kitchen hoods and their role in the proper functioning of ventilation systems. Inhaling exhaust from a kitchen hood can have serious health consequences. If your home doesn't have a kitchen hood, then install a hood in your kitchen, bathroom, or laundry room immediately.

How much do kitchen hoods cost? How does air quality affect my respiratory tract? Where should I locate my kitchen hood? What about plumbing? Why am I finding out these things now?

It's quite common for homes to come equipped with kitchen exhaust fans that rarely ever get used. That changes once you discover how beneficial it is to use a good quality hood system instead. Once you've got that installed, find out how easy it is to breathe under ideal conditions, but what happens if you're eating something, near smoke, or drinking through straws?

A kitchen hood is a ventilator that is located above your stovetop. Kitchen hoods help control grease from cooking food and prevent smells from being released into your home. They are also known as exhaust hoods or extractor hoods. You can find them in many restaurant kitchens, but they are becoming increasingly common for residential use.

Kitchen hoods come in different sizes and shapes. Most are rectangular in shape and have a motor or fan mounted inside the box. Some hoods are designed specifically for commercial-size ranges, while others can work with both small and large stoves.

Kitchen hoods help reduce the risk of food-borne illness caused by airborne pathogens that are present in the kitchen air. They can help prevent bacteria from spreading throughout your home, reducing the need for frequent cleaning.

The kitchen hood has been around since ancient times; however, the modern-day kitchen hood has changed quite a bit over time. This article will discuss some of the different types of kitchens that are out today. This information, it can help you determine what type of vent would work best for your needs. There are two types of kitchen hoods: exhaust hoods and extractor hoods. Each type performs different functions and is used for specific purposes.

Exhaust Hood :

An exhaust hood is designed to remove fumes from cooking areas. Exhaust hoods have the ability to pull air through a filter unit where they capture any particles or smoke. This then allows them to take that air outside of the home safely. These types of hoods usually include a motor, heat exchanger, fan, blower, filters and exhaust system. They come in many sizes to fit into any space needed and are usually installed at the ceiling level. These hoods are good for removing odors and fumes from an entire room while providing proper ventilation.

Exhaust Hoods are of two types.
* Type - 1
* Type - 2

* Type - 1 :

            It is used for removing grease and smog used for cooking appliances.

* Type - 2:

            It is used for removing steam vapor, heat, and odor when grease is not present. And it is also used for dishwashers, steam tables, etc.

Basic Styles of Type - 1 Hood:

* Wall mounted Canopy hood
* Single Island Hood / Single Skin Hood
* Double Island Hood / Double Skin Hood
* Backshelf / Proximity Hood
* Passover Hood
* Eyebrow hood

Basic Styles of Type - 2 Hood :

* Oven Hood
* Condensate Hood

Type - 1 Hood 

* Wall Mounted Canopy Hood:


            It should have a 3" building gap between hood and wall. Minimum overhung requirement is 6" on the side and 6" - 12" in front for a full capture of exhaust air.

* Single Island Hood / Single Skin Hood:


        Recommended overhung of island hood should be 12" from all 4 sides to capture exhaust gases/air.

* Double Island Hood / Double Skin Hood:


Recommended overhung of double island hood should be 6-12" from all 4 sides to capture bad/exhaust gases.

* Backshelf / Proximity Hood

This type of hood is built right at the back side of your countertop, where a majority of grease and other food particles are likely to fall down. In order to keep this area clean, you can install a backsheet proximity hood over your existing kitchen ventilator. These kinds of hoods are designed specifically to keep the grease from falling into the air duct while improving efficiency. They can easily be installed if you have a kitchen exhaust fan in place.

* Type - 2:

* Oven Hood:

        It helps in the removal of heat and odor. Here, a Canopy hood is used with no filters. Hood size is determined with the oven when doors are open.

Some Design points regarding the Kitchen ventilation system:

* Exhaust air / Makeup air should be 1500 - 2200 fpm (feet per minute).
* Exhaust duct to be terminated for 40" above the roof.
* Cleanouts can be provided at the base of the riser at every 20'.
* Duct sheet metal gauge is of 16 GA 18 GA 304SS (Stainless Steel).
* Hood construction should be of 18GA minimum.

Materials used for manufacturing Ducts and Hoods:

* Black steel material is used for all kitchen ducts and hoods.
* Stainless steel duct is used for "Laundry Exhaust Ducts".
* Stainless Steel Types:
        - 430SS (Cheap in price and catches rust easily).
        - 304SS (Used for Exhaust Hood/Hood)
        - 316LSS and 317LSS (Low carbon stainless steel . It is a special and pure form of steel that is used for operation theatres and hospitals).

Types of Kitchen Hoods:

* Single island/ single skin hood
* double island/ double skin hood

* Single island/ single skin hood

* Double island/ double skin hood:


Kitchen Hood Design:




* P = 2l + w (for wall type of hood)

* P = 2l + 2w (for island type of hood)

P - the perimeter of the hood

l = l + 0.8 h

w = w + 0.8 h

cfm - 200 x P ( For heavy Cooking )
cfm - 150 x P ( For Medium Cooking )
cfm - 100 x P ( For Light Cooking )

Kitchen Hood Types In Ventilation 

1. Kitchen hoods can be defined as the enclosed space that has been arranged to remove cooking fumes from your kitchen. 

2. The purpose of kitchen hoods is to keep the kitchen air clean, safe, and free from harmful contaminants. 

3. There are many different styles and designs of kitchen hoods. 

4. Kitchen hoods come in two basic styles; pull-out and fixed. 

5. Pull-out kitchen hoods have a hose attached to them, allowing you to easily move the unit into place. 

6. Fixed kitchen hoods usually look like a normal cabinet, but they are built directly into the wall. 

7. If you are looking to purchase a kitchen hood, make sure that it fits your kitchen perfectly before buying it. 

8. You should also consider how much money you are willing to spend on your kitchen. 

9. Make sure you choose one that complements your design, style, and budget.

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