Hvac Flex Duct Design

This involves return air unconditioned coming into the heating cooling system.

Hvac flex duct design. Item 1790033 model 1790033. Duct design 5 sizing the ducts related articles. For more information about the use of flexible ducts read this achrnews article about ductwork design. Shop grainger for self sealing duct and fittings and all your hvac supplies.

Most heating cooling systems now are dual units with different elements for heating or cooling but sharing a blower and ductwork to distribute conditioned air through a house. The master flow 4 in. Flexible hvac ductwork this type of ductwork is usually tube shaped and is made from a wire coil covered in a bendable but durable plastic. Lambro rigiflex 4 in x 96 in aluminum semi rigid flexible duct.

The purpose of residential ductwork design is to properly distribute the airflow produced by your heating cooling system to your house. Other articles in the duct design series. Then by heating cooling that air delivering the newly conditioned air to your home. This additional insulation provides greater thermal efficiency to save energy.

Flexible ducts often called flex made from reinforced plastic are easier and cheaper to install but not as strong and durable as sheet metal. Manufacturers then cover the tube in fiberglass insulation. The duct has r6 insulation which contains 33 more insulation than the standard r4 2 product. Engineered with a leed qualifying zero voc gasket this ductwork can eliminate the need for additional sealing along the longitudinal seams and transverse joint.

The science of. Duct design 3 total effective length. Duct design 4 calculating friction rate. Design of flexible duct junction boxes current standards ashrae 2012 hvac systems and equipment box plenum systems using flexible duct constrains box width to 2 3x entrance width constrains box length to 2 x box width flat pressure loss 0 05 in.

In a flex system each curve has a huge impact on the tel and when a field install doesn t match the design it can throw the whole system out of whack both from an air balance standpoint as well as a system performance by increasing the tesp total external static pressure. The 2 primary causes of reduced air flow in ducts. Insulated flexible duct r6 silver jacket is used in standard heating and air conditioning hvac systems and some venting applications. Duct design 2 available static pressure.

Of water 50 ft of el mentions entrance fitting. Keep the curves to a minimum when designing a duct system you must calculate tel total effective length not just length.