Return Air Duct Size Chart
For sizing the supply and return trunks select the duct size at the intersecting lines of the friction rate and the equipment cfm.
Return air duct size chart. Select duct size using friction chart or duct calculator how: The size of a grill, the mechanical movement of air, and the mathematics that govern the establishment of correct return air vents are determined by these organizations. 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.
The most common furnace filter sizes are 10 x 20, 14 x 20, 16 x 24, 18 x 30, 12 x 12, 14 x 24, 16 x 25, 20 x 20, 12 x 20, 14 x 25, 18 x 18, 20 x 24, 12 x 24, 14 x 30, 18 x 20, 20 x 25, 12 x 30, 15 x 20, 18 x 24, 20 x 30, 12 x 36, 16 x 20, 18 x 25, 4 x 24, and 25 x 25, and these sizes. Note also the return air grille sizing formula at the top of the chart. • to insure proper distribution of air, volume dampers must be used for all branch runs.
Your 14 x 20 return air inlet = 280 sq. Wxh wxh wxh wxh wxh wxh wxh wxh 80 6x6 7x5 9x4 90 7x6 8x5 10x4 100 7 8x6 9x5 11x4 125 7x7 9x6 11x5 13x4 150 8x7 9x6 12x5 15x4 175 8 8x8 9x7 10x6 13x5 17x4. First, let’s define some terms.
The sensible heat ratio is useful in finding g, the moisture content of air, at different conditions using a psychrometric chart. Return air cfm must be equal or greater than supply air cfm. The last step is to size the return grille and duct to match the total of the supply registers.
Proper sizing and orientation of grilles, registers, and diffusers may seem like such a simple thing, but it’s an area where confusion and mistakes are commonly made. Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing. A mismatch in return air inlet grille or duct size will reduce the system's effectiveness.
Duct system sizes and airflow quick chart created date: An insufficient return system or one too large will reduce the efficiency of the heating and increase energy bills. Installation standards and demands are adhered to in order to produce a standard of performance across the career field and ensure the professional installation of hvac systems.
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