Duct Board Vs Sheet Metal

There is a third option phenolic duct that is made of plastic foam with a foil liner on the inside and exterior.

Duct board vs sheet metal.

High air velocity will destroy the fiberglass material. Metal ductwork needs design measurement and installation by or with the help of an hvac professional. Poor fastened and sealed connections. While flex ducts work best for short runs in a trunk and branch system metal duct works best for entire air distribution systems.

And then that goes up maybe i don t know a foot and a half 2 feet. The idea of the porous insulation on the interior just doesn t seem like a good idea. If i am going to have a supply plenum run for approx. The porous surface seems like it would affect air flow i understand properly sized this shouldn t be a problem collect more dirt than metal delaminate and come apart over time and are very hard to clean once dirty.

Flexible ducts are good for air quality because you are not breathing in fiberglass insulation lined ductwork like the fiber air ducts and they are mold and rust resistant unlike galvanized sheet metal ductwork. I just don t know what that is. If you re going this far perform a flowhood test to determine where how much improved airflow can be had. I have never liked duct board or ducts lined with fiberglass.

Proper aspect ratio for velocity and pressure drop is more important than sheet metal. Coat seal the interior of the duct board using an airless sprayer. It is not rodent proof. The inner liner ribs restrict airflow more than sheet metal ductwork but not significantly.

Up from the furnace comes a metal ducting duct work that goes up. You need a pro for this. There actually are a few reasons most hvac techs prefer metal ducting. And then beyond that it s the ductwork is made of cardboard.

Duct board vs metal plenums supply is on perferable over the other. 25 feet should it be ductboard or metal and is hard pipe runs preferable over flex. I don t know what kind of cardboard and i m sure there s a name for it. Odds are the efficiency airflow of your duct system can be greatly improved.

It hasn t been on the market long enough to weigh in on its merits and shortcomings and will not be included in this comparison. Sharp edges inside will cause material erosion. Generally airflow is better with metal ducting after a couple of years typically because of the dust and.