What size flex duct should I use?

The specific measurement will depend on the type of hose in question, but ID measurements in flex duct sizing typically range from 1” to 24”. The inside diameter of flex hose is important because, this size fits over the OD of the pipe that it is connected to.Click to see full answer. In respect to this, how do I know what size flex duct I need? How to Size a Flex Duct Measure the length and width of the room where the flex duct will be supplying the air. Multiply the length and width together to get the square footage of the room. Figure out the amount of CFM that is required for the room. Use the online duct calculator (see References) and calculate the needed flex duct size. Secondly, is flex duct any good? Flexibility. Flex ducts are better for existing trunk-and-branch heating and cooling systems. This is because they’re more versatile and flexible. Metal ducts are more rigid due to the nature of steel, making them ideal to build an entire HVAC system. Also asked, how far can you run flex duct? E. Flexible duct shall be supported at manufacturer’s recommended intervals, but at no greater distance than four feet. Maximum permissible sag is 1/2 inch per foot of spacing between supports. A connection to rigid ducting or equipment shall be considered a support joint.Does Flex duct reduce airflow?Friction is the enemy of airflow. Unlike rigid ducts, which are cut to length within a tolerance of 1 inch or less, it’s easy to cut a length of flexible duct that’s several feet longer than is needed to get from point A to point B [2A]. That creates slack in the duct, which reduces airflow for two reasons.

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