Is flexible ductwork bad?
Flexible ductwork not only resists airflow, but is also more susceptible to a poor installation. Any number of factors can go wrong, including a poorly sealed joint, excessive length that lacks support and crumpled sections. Also, the material itself is less durable than sheet metal.
How long can you run flexible duct?
1. 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.
Should I replace metal duct with flexible?
Because metal ductwork lasts longer than flex duct, it’s more costly to create, transport, and install. Flexibility. Flex ducts are better for existing trunk-and-branch heating and cooling systems. … Metal ducts are more rigid due to the nature of steel, making them ideal to build an entire HVAC system.
Should flex duct be pulled tight?
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 shorter intervals.
How much flex duct should be used?
Supports should be at least 1½ inches wide. In long horizontal runs with sharp bends, use extra supports before and after the bends. Don’t let the ducts sag more than ½ inch per foot between supports; maximum sag shouldn’t exceed 2½ inches [4E]. Support straps should not compress the inner core or constrict airflow.
Is replacing ductwork easy?
Yes, having punctures in your ductwork due to pests is something that necessitates getting those ducts replaced, or at least repaired, and, yes, it is also a really tough job for you to take on yourself.
Can I use flexible duct for return air?
Flex duct doesn’t come in an R12 version, so you will have to wrap it. Its fine to use for a return.