## How many CFM should a grow room have?

To calculate multiply length x width x height of growing area e.g. A room that is 8′ x 8′ x 8′ will have a volume of 512 cubic feet. Your extraction fan should be able to adequately exchange the air in an indoor garden once every three minutes. Therefore, 512 cubic feet / 3 minutes = 171 CFM.

### How do I calculate CFM for exhaust fan?

The rule of thumb is that you need at least 1 CFM per square foot of room area. To determine the square footage of your bathroom, multiply the length times the width. For example, if your bathroom is 6 feet wide and 9 feet long, its square footage is 54. Therefore, it should have a fan rated for at least 54 CFM.

#### What size exhaust fan for 10×10 grow room?

For a 10′ x 10′ space, assuming you have 8 foot ceilings, you’re cubic footage adds up to 800 cf. This means you’ll need an exhaust fan with a cfm rating of around 160 in order to remove the air every 5 minutes.

**How many CFM does a 5×5 tent need?**

With the appropriate wattage information for a 5×5 grow tent, make sure that your fans or coolers can produce at least 400 CFM of air. I say a least because that should only be the minimum. Check on the heat that your lights can produce and the temperature inside your grow tent.

**How is CFM air flow calculated?**

CFM = (fpm * area), where fpm is the feet per minute. To find the cubic feet per minute, substitute the FPM value with the area after the area is squared.

## How many CFM does a bathroom fan need?

For most bathrooms this works out to one CFM per square foot of bathroom area. For example, a 7′ x 10′ bathroom would require a 70 CFM fan. A 50 CFM rating is recommended as a minimum for bathrooms 50 sq. ft.

### How often should air be exchanged in grow room?

every 5 minutes

Air in your grow area should be exchanged at least every 5 minutes. If you are using a grow tent that is 5′ x 5′ x 6′ this is 150 sq/ft of air. For optimal airflow, you need a filter and fan that can move between 30 and 60 cubic feet per minute (CFM). It is also important to balance the flow in and out of air.

#### How often should I exhaust my grow room?

every three to five minutes

An air extractor fan system cycles out old air and brings in fresh air, which your plants need if you want them to thrive. Ideally, your extractor fan system should replace the air in your grow room every minute, or at least every three to five minutes.

**How many CFM do I need for 500 square feet?**

133 CFM

That’s why we need to divide the total volume by 60; hence 4,800/60 = 80 CFM. Answer: You need an 80 CFM airflow (for 300 sq ft standard room and 2 ACH)….CFM Chart For Common Room Sizes.

Room Size: | CFM (At 2 ACH) |
---|---|

How many CFM do I need for a 500 sq ft room? | 133 CFM |

How many CFM do I need for a 600 sq ft room? | 160 CFM |

**What size exhaust fan do I need for my grow room?**

4ft (length) × 2ft (width) × 5ft (height) = 40ft³ For a grow tent of this size, you’ll want to pick an exhaust fan with at least 40 CFM. As a general room of thumb, we recommend picking a fan with a CFM equal to the volume of your tent/room. This will ensure your fan completely replaces the air in your grow space every minute.

## What are inline exhaust fans?

An inline exhaust fan is best defined as a fan that is mounted inline (inside or connected to ducting) that is used for extraction purposes.

### What is exhaust fan system?

Typically, an exhaust ventilation system is composed of a single fan connected to a centrally located, single exhaust point in the house. A preferable option is to connect the fan to ducts from several rooms (especially rooms where pollutants tend to be generated, such as bathrooms).