How many cfm should my exhaust fan be?
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.
How many cfm do I need to cool my garage?
A garage fan needs to provide enough air movement to cool a large area efficiently and must be robust enough to withstand a harsher environment. Garage fans are usually rated by airflow in cubic feet per minute (cfm) and you need approximately 1 cfm of airflow per square foot of space.
How do you calculate air delivery of an exhaust fan?
You measure the velocity at a points in the duct and find the average velocity in the exhaust duct is 400 FPM. Multiply 400 Feet per Minute times the area of the duct, which is . 35 square feet, to find 140 CFM exhaust fan airflow.
What are Sones in bathroom fans?
Defining the Sones Rating A sone is defined as a unit of sound or loudness. Sones are used to measure noise, such as fans, which includes kitchen fans, bathroom fans, and those found in your range hood. One sone is equal to about 1,000 Hz with a sound level about 40 decibels above a normal reference level.
How many CFM do I need for a 2 car garage?
The average two-car garage is about 400 sq. ft., so your ideal garage fan would have a CFM of between about 4,000 to 6,000.
How many CFM do I need for a 3 car garage?
Garage exhaust fan size guide
| Number of Cars Garage Holds | Average Garage Size in Feet (Width x Length) | Fan Size for Regular Garage |
|---|---|---|
| Two cars | 20 x 20 | 320 CFM |
| Two cars | 20 x 22 | 352 CFM |
| Two trucks | 22 x 22 | 387.2 CFM |
| Three cars | 32 x 22 | 563.2 CFM |
How many HP is a cfm?
The horsepower – Metric unit number 0.065 hp converts to 1 atm cfm, one atmosphere cubic foot per minute. It is the EQUAL power value of 1 atmosphere cubic foot per minute but in the horsepower – Metric power unit alternative.
What is a good cfm for a bathroom fan?
Most fans are rated from 50 to 110 CFM, but some models designed for large master bathrooms, rec rooms and home theaters can be rated even higher. In general, choose a fan that can move at least 1 CFM per square foot of room. So, for an 80 square foot bathroom, select an 80 CFM fan.
What is good cfm for bathroom fan?
In general, choose a fan that can move at least 1 CFM per square foot of room. So, for an 80 square foot bathroom, select an 80 CFM fan. For bathrooms 50 square feet and smaller, it’s recommended you purchase a bath fan designed for small rooms. In other words, choose under 79 CFM bath fans.
How many CFM do I need for bathroom fan?
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.