Duct Erector/Fitter recruitment agency listing. Duct erectors and fitters install air flow systems within buildings, such as those used for air conditioning. They usually work on buildings during the construction phase as ducts tend to be an integral part of the framework.

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## What is the return air duct?

The ductwork in your residential forced-air HVAC system is the network of pipes through which heated or cooled air travels. Return air ducts balance airflow in your HVAC system — The primary role of return ducts is to bring air that has been warmed or cooled back to your furnace or air conditioner.

## How long does it take to install ductwork?

Generally speaking, a full HVAC system replacement will take around three days to complete; one day for the changeout, and two days to do the ductwork. More extensive ductwork might require three or four days.

## How do you measure duct size?

How to Measure Ductwork

1. Measure the top width of the ductwork.
2. Measure the side height of the ductwork.
3. Ascertain the size of the ductwork.
4. Wrap a string or other flexible object completely around the circumference of the ductwork.
5. Unwrap the string and stretch it out on a flat surface.

## How do I calculate cfm?

How to Calculate the CFM of a Room

1. Measure the room’s width and length.
2. Multiply the three measurements from step 1 to determine the cubic footage of the room.
3. Multiply the cubic volume of the room by the number of times you want the air to turn over or exchange in an hour.
4. Divide your answer from step 3 by 60 to calculate CFM.

## Should ductwork be replaced after 20 years?

“If your ductwork is over 15 years old, you probably should replace it. Ductwork has a maximum lifespan of 20-25 years. By 15 years, however, it begins to deteriorate, significantly reducing your HVAC system’s efficiency, so replacement is the prudent option.”

## Is exposed ductwork cheaper?

Installation. A good exposed duct installation should cost a little more than one that will never be seen above a ceiling. It doesn’t have to cost a lot more, but all of those special design features, shipping strategies and backup plans cost money.

## One may also ask, what are the different types of ductwork?

There are three main types of rigid ductwork: sheet metal ducts, fiberglass lined ducts, and fiberboard ducts. Sheet Metal Ducts: Sheet metal ducts are usually made of either galvanized steel or aluminum. Aluminum ducts are lightweight and very easy to install.

## How do you design a duct system?

6 Tips for Good Ductwork Design

1. Choose the best location for HVAC equipment and ducts.
3. Consider your equipment type and supporting systems.
4. Use the right materials, fittings and supports.
5. Choose the right duct size and layout.
6. Ensure proper ductwork sealing.

## Besides, what is duct system?

THE DUCT SYSTEM, used in air heating and air cooling your home, is a collection of tubes that distributes the heated or cooled air to the various rooms. This system can make a big difference in both the cost and the effectiveness of heating and cooling the home.

50 years

## What is the best material for ductwork?

Galvanized steel and aluminum are the most common materials for sheet metal ducts. Aluminum in particular is relatively light and easy to install. They are also the least likely to harbor dangerous molds or growths because they have non-porous surfaces.

## Accordingly, how much does it cost to get ductwork?

Expect to pay \$35-\$55 per linear foot (including labor and materials). This amounts to an average of \$1,000-\$5,000 for a typical home. An average single-family home needs anywhere from 30 to 90 linear feet of ducting, but the specific total length depends on your home’s unique layout.

## Can you use flex duct return air?

Re: Flex Duct on Return Air Diffusers – Yes or No? Flex duct effectively creates a tight radius elbow where it turns into the top of a diffuser. The high pressure loss is further increased because the flex fabric gathers at the inside of the throat and reduces the effective diameter.

## How do you know if you need new ductwork?

Some of the most common signs you should replace your ductwork are old ducts, high utility bills, and poor indoor air quality.

1. Old Ductwork. The ductwork in most homes lasts between 10 and 15 years before problems arise.
2. High Utility Bills.
3. Poor Indoor Air Quality.

## What are standard duct sizes?

Rectangular or square ducting comes in standard sizes ranging from 3-by-7 inches to 35-by-40 inches. Sizing is based on airflow needs per cubic foot per minute, as well as velocity.

## Does Flex duct reduce airflow?

Friction is the enemy of airflow. Unlike rigid ducts, which are cut to length within a tolerance of 1 inch or less, it’s easy to cut a length of flexible duct that’s several feet longer than is needed to get from point A to point B [2A]. That creates slack in the duct, which reduces airflow for two reasons.

## What is the function of duct?

Ducts are conduits or passages used in heating, ventilation, and air conditioning (HVAC) to deliver and remove air. The needed airflows include, for example, supply air, return air, and exhaust air.

## How do air ducts work?

As earlier stated, air ducts are tubes connecting a HVAC system with different air vents installed in a house. They system forces the heated or cooled air through the air ducts and then through the air vents in order to heat or cool the house.

## Is round or square duct better?

A round duct, however, is more efficient than a rectangular duct in performing the same task; it is also smaller in cross-sectional area and has less duct wall exposed to moving air. The rectangular duct has 32% more metal in it, and should cost proportionately more. • One big disadvantage of round duct is its height.

## Is flex duct any good?

Flexibility. Flex ducts are better for existing trunk-and-branch heating and cooling systems. This is because they’re more versatile and flexible. Metal ducts are more rigid due to the nature of steel, making them ideal to build an entire HVAC system.