Why Use Fiber Duct Versus Sheet Metal

Flex ducts are better for existing trunk and branch heating and cooling systems.

Why use fiber duct versus sheet metal.

Duct joints should always be secured with 8 sheet metal screws before seams are sealed with mastic. Metal ducts are more rigid due to the nature of steel making them ideal to build an entire hvac system. The blue curve is the sheet metal curve the green curve is that of unfaced or finished duct board and the yellow is our best estimate of the desi gn values for the laminate faced new generation duct board product. Sheet metal friction is based on surface and joint.

Fiberglass lining is used to insulate air ducts from heat loss or to avoid condensation in cases where the supply air is very cold or there is a high ambient humidity in the plenum. I have never liked duct board or ducts lined with fiberglass. Made from sheet metal ducts with internal and external fiberglass lining. Because of what it s made out of it tends to last a long time especially when it is properly cared for.

The mastic is spread over duct seams with a disposable paintbrush putty knife or. These three curves are shown in figure 1. Use to design the duct systems. Fiber glass lined ducts.

The idea of the porous insulation on the interior just doesn t seem like a good idea. Sheet metal fibergl ductwork fabrication installationbeach. N in fibergl removal before and after page 3 duct flow wikiwand fibergl conduit hangers champion bridge fibergl conduit hangers champion bridge n in fibergl removal before and after page 3 harold r whelden heating refrigeration. This is because they re more versatile and flexible.

The most common materials used for sheet metal ducts are aluminum and galvanized. Mastic is a gooey non hardening material with a consistency between mayonnaise and smooth peanut butter. Some sheet metal air ducts are lined with an external or internal fiberglass duct liner. Made from compressed fiberglass strands which are bonded with resin and covered with a foil laminate for moisture protection.

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. We use all metal duct with wrap on the outside only. We see to much duct board falling apart at the joins with nasty mold growing in it. One of the major advantages of sheet metal ductwork is its staying power.

We also use third party cookies that help us. As for metal v flex for taps thats your call metal is better but flex is fine. As a rigid material your sheet metal ductwork needs to have adequate space.