Duct Board Vs Sheet Metal

And then beyond that it s the ductwork is made of cardboard.

Duct board vs sheet metal.

There actually are a few reasons most hvac techs prefer metal ducting. I have never liked duct board or ducts lined with fiberglass. There is a third option phenolic duct that is made of plastic foam with a foil liner on the inside and exterior. While flex ducts work best for short runs in a trunk and branch system metal duct works best for entire air distribution systems.

Duct board vs metal plenums supply is on perferable over the other. High air velocity will destroy the fiberglass material. Replace redesign the duct board with sheet metal. 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.

If you re going this far perform a flowhood test to determine where how much improved airflow can be had. Up from the furnace comes a metal ducting duct work that goes up. The idea of the porous insulation on the interior just doesn t seem like a good idea. And then that goes up maybe i don t know a foot and a half 2 feet.

I just don t know what that is. The inner liner ribs restrict airflow more than sheet metal ductwork but not significantly. Poor fastened and sealed connections. When homeowners receive quotes from hvac contractors they typically are given two duct replacement options sheet metal or fiberglass duct board.

Sharp edges inside will cause material erosion. I don t know what kind of cardboard and i m sure there s a name for it. Duct board is ok if the system design is correct and the duct and fittings are properly made and installed. 25 feet should it be ductboard or metal and is hard pipe runs preferable over flex.

Proper aspect ratio for velocity and pressure drop is more important than sheet metal. You need a pro for this. Generally airflow is better with metal ducting after a couple of years typically because of the dust and. Coat seal the interior of the duct board using an airless sprayer.

If i am going to have a supply plenum run for approx. Metal ductwork needs design measurement and installation by or with the help of an hvac professional. Odds are the efficiency airflow of your duct system can be greatly improved.