![]() We will use the 500 CFM face velocity and 70% grille free area to make the calculation. We will show you how to properly estimate the grille size in CFM as well as in inches. There are two ways how to figure out what return grille size you need: However, not everybody knows what return grill size to choose. Everybody knows that an adequately sized grill will ensure smooth airflow. In HVAC, we have to choose the right return air grille size. You May Like: Are Green Mountain Grills Made In The Usa Return Air Grille Sizes: 3 Cfm Charts + Grille Size Calculator If this is not the result you want on your hardware, please discuss with us for giving more information on the advantages or disadvantages of other alternatives.*Bronze is a classic material timeless and yet so changeable.INSTALLATION:For Floor: Select Registers without holesFor Wall and Ceiling installation: Select Registers with countersunk holes You should be aware that in most natural environments, verdigris is to be expected and results from the chemical reaction of sweat, dust, or changing weather conditions on metal. The finish ages naturally resulting in a unique patina and an overall ultimate finish.A textured surface of casted bronze architectural hardware is offered with natural bronze and bronze patina finish The color of weathered/aged finishes will continue to evolve over time and can verdigris in different climatic conditions. The higher the level of copper the higher will be the resistance to corrosion.The natural bronze finish is a LIVING FINISH that changes over time with the environment, climate, surroundings, and level of use. The custom made Air return Cover in Traditional design is Handmade in Solid Cast Bronze and comes with a LIFETIME WARRANTYThe beauty, strength and forever lasting feature of Bronze makes it the most desirable metal.Architectural bronze is a metal alloy that consists of 85% copper and other metal alloys. Custom Size Handmade Solid Cast Bronze Air Return Grate Cover If you need custom return air grilles be sure to call us for advice and consultation as there are multitudinous avenues to misconfiguring. Generally, custom air return grilles that are cast in a mold are less likely to be good candidates for customization, but most other styles may be workable. Nobody seems to have a duct opening with standard specifications, and no amount of manipulations will make a standard size fit satisfactorily, so we have equipped ourselves to custom make many different sizes, depending upon whatever style you choose. Grille Area = Airflow ÷ Face Velocity ÷ Grille Free Area x 144 Grille Area = 1050 ÷ 500 ÷ 0.8 x 144 Grille Area = 378 sq.inĪlso Check: What Is The Newest George Foreman Grill Custom Return Air Grilles For When Previous Hvac Contractors Or Builders Left Some Challenges For Future Homeowners Solutions For Uncommon Return Air Grille Sizes So, if we recalculate the grille area based on 80% free area, the result is as follow: Return air grille size is calculated using the following formula:Ī typical grille with about 16 inches by 25 inches size has a free area of around 80%. For example a 3-ton residential cooling unit requires 600 square inches of grille area. ![]() As a general rule, you need 200 square inches of return air grille area per ton of your air conditioning equipment.When using the tonnage of your cooling unit to calculate your need: to calculate their area, and that will tell you the number and sizes of return air grilles you need. Use the length and width of common grille or filter sizes 20 X 20, 25 X16, etc.One square inch of filter grille area can handle 2 CFM, so in the example above, you would need 1000 a of total square inches of return grille area.For example, a furnace rated at 100,000 BTUs pushes out 2000 cubic feet of air per minute. If you divide your furnaces BTU rating by 50, that tells you how much CFM your furnace blows.When using British Thermal Units to calculate your need: These ratings can be found on the units themselves, typically as a sticker or newer models or a riveted plate on older models. There are two ways to determine this BTU output of the furnace or the tonnage of your air conditioner unit. This dictates the total amount of return air grill area you need in your home. The capacity of your HVAC system determines the amount of air moving through your system, usually measured in cubic feet per minute. How To Properly Size A Return Air Grille For Capacity
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