Air Conditioning Duct Size Chart

Residential duct sizing guide the following duct sizes are based on a friction rate of 10 inches per 100 feet of lineal duct.

Air conditioning duct size chart.

1 ft3 min 1 7 m3 h 0 47 l s. If desired airflow exceeds the cfm rating increase to the next duct size 4. Air duct flow app. 1 ft2 0 0929 m2 144 in2.

In this case the 5kw is not the right size air conditioner it would struggle because the area is too large and have a considerably shorter lifespan due to working so hard. Free apps for offline use on mobile devices. 1 ft min 5 08x10 3 m s. Duct system sizes and airflow quick chart created date.

Larger volumes or higher static pressures should be dealt with on an individual job basis. Air volume equivalent round air volume cfm 4 6 8 10 12 duct inches cfm 50 6 x 4 550 75 6 x 4 675 100 8 x 4 6 x 6 6 100. This chart can be. Larger air volumes or higher static.

The rectangular duct therefore requires more metal for its construction this adds more weight and costs to the design. This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Select the duct size from the table that can carry that volume of air 3. Psychrometric chart a psychrometric chart is a graphical representation of the properties of moist air and is a useful tool in air conditioning calculations.

An air con works by circulating all the air in a given space not just by blowing cold air in one direction. A round duct with a cross sectional area of 0 6m2 has a perimeter of 2 75m. A rectangular duct with an equal cross sectional area has a perimeter of 3 87m. How to use duct chart.

We will start by illustrating a 5kw cooling pattern. Nominal size mm max recommended air quantity l s flexible duct dia mm sl2ws15. Design 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. Air ducts sizing pdf format.

Air duct velocity app. Air flow air velocity and required air duct area. Identify the volume of air that will be passing through the duct 2. The sensible heat ratio is useful in finding g the moisture content of air at different conditions using a psychrometric chart.