Reading Ductwork Drawings

April 18, 2024 Post a Comment

Reading ductwork drawings

The HVAC drawings provide details for the AC system, refrigerant pipe connections, chiller, and duct layouts. The HVAC plans include plan notes to describe the installation details and fixture types. The commercial buildings' details of AC layout are available on the enlarged unit plan of respective area.

What is a duct drawing?

Ducting shop drawings provide the mechanical contractors and fabricators with detailed information on how the ducts and equipment are placed in the building.

What is the symbol for supply duct?

An “X” in a square or round shape is indicative of Supply Air, while a single Diagonal line indicates return air. The following symbols indicate the type of air but also that of a riser duct. A riser duct is one that penetrates a floor.

Does the size of ductwork matter?

Here's the answer to your question. Ducts that are small in size make your HVAC system work harder to keep your home at the desired temperature. If your duct size is big, the velocity of air gets compromised. It means you will not be able to feel the air flowing through the air vents.

What do HVAC drawings include?

HVAC drawings specify the location and installation details of all heating, cooling and ventilation equipment. They also provide the layout for sheet metal ducts used in air distribution systems.

Is ductwork measured ID or OD?

All flexible ducting hoses have an ID size. The specific measurement will depend on the type of hose in question, but ID measurements in flex duct sizing typically range from 1” to 24”. The inside diameter of flex hose is important because, this size fits over the OD of the pipe that it is connected to.

How do you detail ductwork?

How to Clean Your Air Ducts

Remove vent covers and wash them. Remove your vent covers with your screwdriver.
Cover vent openings with paper towels. Cover the openings to your supply registers with a few paper towels. ...
Loosen the dust. ...
Vacuum it up. ...
Change your air filter. ...
Replace vent covers.

What are the three types of ducts?

There are three main types of ducting used within domestic ventilation systems: rigid ducting, semi-rigid ducting and flexible ducting.

What is the most important aspect in duct design?

Capacity of Ducting Duct sizing is the most important factor to be considered as the circulation fan blows air to every room at low pressure through the ducts from your indoor blower of your furnace or air handler.

How do you know which ducts are supply and return?

Supply vents are usually found high up on the walls in your home, or on the ceiling. Return Vents: These air vents suck air from the rooms in your home back into your HVAC system. They are typically larger in size than supply vents and you will not feel air blowing out of them.

How can you tell the difference between supply and return ductwork?

To identify a return vent, take a piece of paper and hold it up to the vent. If the paper is drawn towards the vent, then it's a return vent. Return vents are usually larger than supply vents, and they usually don't have adjustable slats to direct airflow since the air is going into the ducts instead of out.

What does TDF stand for duct?

Lockformer came out first with a TDC Rollformer (Transverse Duct Connector) and then Engel followed with their TDF Rollformer (Transverse Duct Flange).

Is it better to undersize or oversize ductwork?

It's better to be a little undersized than oversized, You'll get a little longer run time, but it's better than shortcycling.

Does reducing duct size increase CFM?

The key takeaway here is that air moves from a larger to a smaller duct, the velocity increases. When it moves from a smaller to a larger duct, the velocity decreases. In both cases, the flow rate — the amount of air moving through the duct, in cubic feet per minute — stays the same.

Does reducing duct size increase pressure?

If your ducts are too small to accommodate the air flowing through them, the pressure increases and backs up in the system. This causes resistance for the blower fan, reducing your HVAC system's efficiency and longevity.

How do you read mechanical drawings?

Lines

Visible line: Indicates an edge is visible in relevant view.
Hidden line: Indicates the edge is behind a face.
Phantom line: Mostly used to indicate an alternate position of a moving part.
Centre lines: drawn to indicate the exact geometric centre of the assembly.

What are the four 4 main types of HVAC systems?

HVAC systems are divided into four categories which come in different sizes and specifications that fit into your home or business.

Heating and cooling split systems.
Hybrid split system. ...
Duct free (Mini-split) ...
Packaged heating and air conditioning system.

What three 3 components are present in an HVAC system?

Your HVAC System has 8 Components

Furnace. This is the KEY component and largest of your HVAC system.
Ductwork. The system of ducts that transports air warmed or cooled by the system to the various areas of your home is called Ductwork. ...
Vents. ...
Thermostat. ...
Heat exchanger. ...
Evaporator coil. ...
Condensing unit. ...
Refrigerant lines.

How do you read duct size?

If you have round ducts, you simply measure the diameter (D) of the duct (the cross-section). This will tell you what size duct to purchase to replace it. If you have rectangular or square ducts, measure the width (W) and height (H) of the duct and use these figures when buying new parts.

How is ductwork measured?

Measure the end of a square or rectangular duct each way to determine the size. If the duct fitting inside the wall transitions to a circular duct, measure inside the circular duct from top to bottom. Repeat this at the remaining grills and ducts throughout the house.