Air Flow Hvac Cfm Chart

An easy way to select the correct air compressor size is by basing it on the highest rated air tool you ll be using.

Air flow hvac cfm chart.

As you can see in the chart 4 000 cfm is achieved at approximately 0 21 static pressure drop. Airflow is measured in cfm or cubic feet per minute. 120 f return air temp. Humidity 400 cfm ton shr above 85 17º td low humidity 450 cfm ton cfm total heat equation cfm btu hr 4 5 x h x acf sensible load 1 08 x td x acf friction rate used in duct calculators friction rate pressure drop is the available static pressure.

How do i measure the volume of a room. A room measuring 1 000 ft would need a 1 000 cfm system to replace all the air each minute. Another great way to measure airflow is to calculate how much total cooling the unit is doing based on the current conditions and compare. It is a measurement that shows how much air flows into a space per minute.

Cfm 4 cfm 6 cfm 8 cfm 10 cfm 12 60 6x4 60 4x6 90 4x8 120 4x10 150 4x12 90 8x4 110 6x6 160 6x8 215 6x10 270 6x12 120 10x4 160 8x6 230 8x8 310 8x10 400 8x12 150 12x4 215 10x6 310 10x8 430 10x10 550 10x12 180 14x4 270 12x6 400 12x8 550 12x10 680 12x12 210 16x4 320 14x6 490 14x8 670 14x10 800 14x12 240 18x4 375 16x6 580 16x8 800 16x10 950 16x12 270 20x4 430 18x6 670 18x8 930 18x10 1100 18x12. Cfm air flow chart cfm chart hvac ductwork hvac tools hvac design. Ach cfm x 60 area x height where area is the area of the space where you intend to have an hvac device and height is the height of the ceiling. Typical air flow rates in cfm vary depending on the type of cooling system.

If the measured static pressure drop is not close to 0 21 adjust the blower speed as necessary to get within 5 of the target cfm. Shr below 80 21º td high humidity 350 cfm ton shr 80 to 85 19º td ave. 350 cfm per ton of cooling capacity is required for high latent heat hvac applications. For rooms with a lot of windows or have long periods of direct sunlight you want 2 cfm per square foot.

You want 1 cfm per square foot so the above room s requirement would be 100 cfm. Multiply these together to get the square footage of the room i e if the room is 10 ft x 10 ft the square footage would be 100. We always get cfm but that is the volume of air per minute. Measured across the cooling coil typical a c air flow is about 400 to 450 cfm per ton of cooling capacity.

Airflow calculations for furnaces btuh 100 000 supply air temp. The formula is basically how many cubic feet of air can an hvac unit provide every hour divided by the volume of the room. This is the formula for ach air changes per hour.