Common Residential Hvac Duct Sizes

Ductwork is composed of.

Common residential hvac duct sizes.

Round duct and rectangular duct comparison a round duct with a cross sectional area of 0 6m2 has a perimeter of 2 75m a rectangular duct with an equal cross sectional area has a perimeter of 3 87m the rectangular duct therefore requires more metal for its construction this adds more weight and costs to the design. Larger volumes or higher static pressures should be dealt with on an individual job basis. Acca manual d is the industry standard containing procedures used for designing residential duct systems. You can obtain a copy.

Increased by 1 round size for up to 800 cfm and 2 round sizes above 800 cfm to insure proper airflow. Larger volumes or higher static pressures should be dealt with on an individual job basis. Commonly used rectangular duct sizes in air handling ventilation systems. Standard hvac duct sizes.

Flex duct 05 on most metal duct calculator round metal pipe 06 on most metal duct calculators field duct sizing chart rectangular sheet metal duct 07 on most metal duct calculators. Duct system sizes and airflow quick chart created date. Furnace filters come in a range of sizes and different brands and types of furnaces use different filters. Failure to do so will result in high velocity and very likely loss of airflow.

The most common furnace filter sizes are 10 x 20 14 x 20 16 x 24 18 x 30 12 x 12 14 x 24 16 x 25 20 x 20 12 x 20 14 x 25 18 x 18 20 x 24 12 x 24 14 x 30 18 x 20 20 x 25 12 x 30 15 x 20 18 x 24 20 x 30 12 x 36 16 x 20 18 x 25 4 x 24 and 25 x 25 and these sizes. Air volume equivalent round air volume cfm 4 6 8 10 12 duct inches cfm 50 6 x 4 550 75 6 x 4 675 100 8 x 4 6 x 6 6 100 125 10 x 4 6 x 6 7 125. Common circular ductwork sizes used in air handling ventilation systems. The following duct sizes are based on a fraction drop of 10 inches per 100 feet of lineal duct.

This equal friction method of duct sizing should be adequate for normal residential furnace heating and air conditioning applications. Mm height mm 100.