Hvac Duct Fittings Pdf

Duct system design guide first edition 2003 mcgill airflow corporation mcgill airflow corporation one mission park groveport ohio 43125 duct system design.

Hvac duct fittings pdf. Tp sp vp equation 1 3 where. Rectangular duct and fittings are one part of our complete line of hvac products. 7 snap lock technology galvanized pipe round and oval 14 pipe 16 pipe 18 pipe 20 pipe 24 pipe 12 pipe 10 pipe 9 pipe length gauge item 2 24 140209. Download printable pdf file of catalog rect duct product pages rectangular single wall duct ductwork fittings.

Rectangular single wall duct fittings sheet metal connectors inc. Into a junction in a ductwork system is equal to the amount of air mass leaving the junction or the sum of air masses at each junction is equal to zero. It also depends on the airflow requirements per cubic foot. Hvac duct fittings.

The ultimate faq guide what are the standard duct sizes. Smc tdc slip drive and raw sheet metal connectors inc. Smc manufactures coil line ductwork in 4 5 6 lengths. 10 7 duct fittings and transitions 28 10 8 aspect ratio 32 10 9 standard duct sizes 32 11 0.

Rectangular duct and fittings are one part of our complete line of hvac products. Lambro rigiflex 4 in x 96 in aluminum semi rigid flexible duct. For pricing and availability. In most cases the air in a duct is assumed to be incompressible an assumption that overlooks the change of air density that occurs as a result of pressure loss and flow in the ductwork.

Ductwork design considerations 33 11 1 duct frictional resistance 33 11 2 duct equivalent length 35 11 3 ductwork system effect 35 11 4 installation issues 37 11 5 ductwork insulation 38 11 6 ductwork air leakage 39. Duct design fundamentals pressure losses friction colebrook equation f d h re f 2 51 3 7 2log 1 type equation here. Diameter for round ducts ranges from 4 9 inches to around 41 inches. Imperial 6 in x.

Most standard duct sizes for rectangular ducts range from 35 40 inches to 3 7 inches depending on the airflow requirements per cubic foot. Energy is due to elevation above a reference datum and is often negligible in hvac duct design systems. All ductwork comes standard with stiffening beads. Sheet metal connectors inc.

Consequently the total pressure or total energy of air flowing in a duct system is generally equal to the sum of the static pressure and the velocity pressure. The colebrook equation was developed to calculate the friction factor f requires you to also know the reynolds.