It essentially represents the longest path that air can take through your system. The TEL is the total length of all your ductwork runs, branches, and bends. If you have a 2,000 CFM blower, the maximum velocity would be the square root of (2,000 x 4.5) = 94.87 feet per minute. The maximum velocity is typically around 1,500 feet per minute for most systems. You can calculate the maximum velocity of your system by taking the square root of the product of your blower’s CFM and 4.5. This is the fastest speed that air can travel through your ductwork without causing damage, loud noises, etc. The final key factor to consider when designing the duct sizing for your home is the maximum velocity of your system. You can determine the maximum CFM of your blower by taking its cooling capacity size in tons or BTUs (12,000 BTUs equals 1 ton) and multiplying it by 400.įor example, if you have a 5-ton AC unit, its maximum CFM will be 5 x 400 = 2,000 CFM blower. A larger home will require a larger blower to ensure adequate airflow. The size of your HVAC system’s blower depends on the size of your home. More rooms will require more ductwork branches and ventilation to maintain comfortable temperatures. The number of rooms in your home will also play a role in determining the size of your ductwork. If you don’t know your home’s square footage, check the blueprints or simply measure each room with a tape measure. A larger home will require more ductwork to ensure adequate airflow throughout the entire space. The size of your home will directly impact the size of your ductwork. Some HVAC dealers also list the unit’s tonnage or BTU on their sales estimates or invoices.When sizing the ductwork for your home, there are many important factors that you need to consider. Divide the two-digit number by 12, and you have the tonnage. Add three zeroes to the number and you have the BTU rating. Within the string, you should see an even, two-digit number. Otherwise, you should be able to find it in the manual.Īn air conditioner’s model number is a string of numbers and letters. The model number is generally written on the side of your air handler or condensing unit. How to Find Your Current Air Conditioner’s Tonnage or BTU Ratingįirst, locate your air conditioner’s model number. Doesn’t remove enough humidity, facilitating mold and mildew growthĪre you experiencing any of these problems with your current air conditioner? Ask Kobie Complete (or your local HVAC dealer) whether your unit may be under- or oversized.Creates additional wear and tear on AC components and ductwork.An air conditioner that is too large or too small for your home will negatively affect its ability to cool and dehumidify. Each home has a different cooling load and thus requires a different size air conditioner. Why is AC Sizing Important?Īir conditioners are not “one size fits all”. When replacing an AC in an existing home, unless there were considerable renovations or other changes to the structure that would affect the cooling load, an HVAC contractor may not consider a detailed load calculation necessary.Ĭontact Kobie Complete (or your local HVAC dealer if you live outside Sarasota and Charlotte County, Florida) for more information on how to get a precise load calculation for your home. Normally, a Manual J load calculation is performed in new construction. A more detailed load calculation will include other factors, such as the size and location of the windows, the direction your house faces, air leakage, the state of your home’s ductwork, and more. These factors are meant to give you a general idea of how much air conditioning your home requires. Our BTU and Tonnage Calculator is Based on the Following:
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