Return Grille Size For 2 Ton

Since from this example the furnace requires 400 square inches for your filter grille you may use either the 25 by 16 filter grille or the 20 by 20 filter grille.

Return grille size for 2 ton. Return air should be sized at 200 square inches per ton according to airmate and other filter grille manufacturers to achieve 2 0 static pressure. 400 fpm is the median air speed for this calculation. Note also the return air grille sizing formula at the top of the chart. Some of the common sizes include 20 by 14 25 by 16 and 20 by 20.

Always round up and we have a tonnage value of 2 5. Calculate the square root of the total. Size and orientation of return grilles and supply registers june 15 2020 bryan orr 2 comments 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. For the same 2 5 ton system with a filter grille the grille size would need to be what size asked rick we usually use a 20 x 20 for 2 5 ton said the tech 20 x 20 x 2 800 800 cfm well that s big enough for a 2 ton but a 20 x 25 may be a better choice.

You need a total of 400 sq. In of return grill size. Measure and verify the grille is pulling the required airflow from the conditioned space after the job is completed and the system has started. Engineering toolbox resources tools and basic information for engineering and design of technical applications.

A return air grill should be sized for an air speed of 300 500 fpm feet per minute. In order to determine the size of the tonnage you have simply divide 980 by 400 cfm per ton. Size the return grille and duct to remove 340 cfm from the pressure zone according to your favorite duct sizing method. The square root of 576 is 24.

One additional diagnostic step to assure duct leakage and thermal duct loss is low. Air return intakes sizes and capacities. We install at least a 20 x 20 with 14 round return duct for a two ton system. Search is the most efficient way to navigate the engineering toolbox.

1 ton of cooling 12 000 btu 1 ton of cooling 400 cfm approximate heat pump size tons minimum duct size square inches minimum return size. The return air duct should have an unobstructed 6. Using those examples you would see their square inches are 280 400 and 400 respectively. Doing this for this space will yield a tonnage of 2 45.

Size and capacity of air return intake.