R-6 duct insulation ==> 6,305 BTU/hour (0.53 ton) R-4.2 duct insulation ==> 7,948 BTU/hour (0.66 ton) The nuers are even higher for the additional heating load. Some other factors to consider The duct insulation R-values I mentioned above are what''s on
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As we continue our study of indoor air quality and filtration, we now come back to duct design. Today''s lesson is on an interesting bit of physics that applies to anything that flows. It could be heat or particles or electromagnetic energy. In our case, it''s air, a fluid
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CUI Devices'' air flow conversion calculator can be used to convert between common units for volume air flow and air velocity flowing past a point in a specified area of duct. To use the calculator, enter your air velocity or volume air flow and duct area/type, select your units, click calculate air flow and your converted velocity and volume units will be shown.
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Flex duct should pulled tight to reduce inner air resistance. It should be supported with straps that are a minimum 1.5" wide. The straps need to be spaced no further than 5 feet apart, but closer is better. Local codes or manufacturers instructions may specify
Air flow is dependent on cross section, so 6" diameter is 28 Sq inches. 4X8" duct is 32 sq inches. Normally we would have the vent fabrior make up a transition that smoothes the turn, but even a 6" circle cut in the 8" side would do.