Take-Off provides an airtight seal when connecting insulated flexible duct or round pipe to a flat surface. This take-off can be used to redirect air from any side of the plenum or to transition from a rectangular pipe run. It can be installed with sheet metal screws (sold separately) and is suitable for most HVAC applications.
What is a takeoff?
But one common term across virtually every trade is the takeoff. Sometimes divided into two words as take off, this type of estimating process helps ensure you’re getting what you need to keep your business operating effectively and at a solid profit.
What is construction takeoff software?
Or takeoff software if working with digital plans in PDF format. A construction takeoff by definition is the process of quantifying the material quantity required for a construction project by counting and measuring items from a set of drawings that construction businesses receive from general contractors and owners.
What is a high-efficiency takeoff?
Our High-Efficiency Takeoff (H.E.T.O) is designed with a rectangular opening and an approximate 45° slope on the body. A flange is turned out on all four sides with each corner being filled.
What are the different types of construction takeoffs?
Construction takeoffs vary depending on the type of construction project. Subcontractors, such as electricians and plumbers, will produce a different construction takeoff than a general contractor. However, while these two takeoffs may look different, they follow the same fundamental process.
What is a duct takeoff?
Top takeoff is used to cut into plenum or rectangular duct to begin a trunk line or branch-like runs. It allows transition from an air plenum or square duct to a round pipe.
What is the difference between a starting collar and a takeoff?
Start collars and take offs are terminology that are used interchangeably. Finger type ( fold over tabs) are generally used in duct board plenum and trunk lines. Collar types are used with sheet metal distribution systems.
How far apart should duct takeoffs be?
This is the 'Two-Foot Rule?. Ideally, you should allow at least 24′ between takeoffs and at the end of any duct run.
What is HVAC offset?
Ventilation Ducting | Rectangular Ductwork | Offsets. Ductwork offsets are a regular part of a ductwork sytem. They are often used to avoid obstacles, either structural, such as beams, columns etc. or to avoid other mechanical services such as pipework or electrical installations.
What is collar in HVAC?
At a main duct or plenum, a starting collar is installed for attaching a straight or split fitting for the ducts. Installing a collar is the first step when installing the system of ducts. The job requires an HVAC plan or a clear idea of the planned duct work and, in some cases, the ability to work in confined areas.
What is HVAC tape?
What Is & How Does HVAC Tape Work? HVAC Tape works the same way you'd use tape to seal or fix an item that was broken. In the case of HVAC tape, it is the only type of tape that will work on air ducts. If your ductwork is not sealed correctly, your home will be less energy efficient.
What are the 4 types of duct systems?
Namely, flexible ductwork, rigid ductwork, and semi-rigid ductwork. We've compiled information on each of these duct systems. These ducts are typically tube-shaped and made of a wire coil covered with a bendable, durable plastic, and surrounded by insulation.
What is the difference between a plenum and a duct?
airflow. A plenum is an air distribution box designed for forced-air systems on residential homes and commercial businesses. It is part of the ductwork, but far different than an air duct as these important boxes handle air as it enters the ducts and helps to recirculate it within a system.
What is a high efficiency takeoff?
High Efficiency Take-Offs (HETO'S) with Adhesive. These take-offs provide a higher efficiency and greater airflow. They come with a 1" flange and with a damper. HETO'S are manufactured of 26 gauge galvanized material.
What is the owl method?
If the offset distance is the O, the width of the duct W and its length L, the angle of the cut the installer needs to make to clear the obstacle can be determined by the following formula: O times W divided by L (O x W ÷ L). This calculation is usually referred to by the acronym OWL.
How do you make duct transitions?
2:3223:32How to Make a Sheet Metal Transition - YouTubeYouTubeStart of suggested clipEnd of suggested clipWell the way that's done is with HTML transition take sheet metal and you fabricate it to create aMoreWell the way that's done is with HTML transition take sheet metal and you fabricate it to create a transition between the new furnace and the existing duct mod. Leave this here in place. This.
How do you calculate 45 offset?
2:183:43The EASIEST way to calculate a 45° offset! | GOT2LEARN - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo calculate from the center of the fitting or the black mark in this case to the end of the hubMoreSo calculate from the center of the fitting or the black mark in this case to the end of the hub portion. This measurement needs to be subtracted two times since you have two 45 degree fittings.
What Is A Takeoff in Construction?
When it comes to construction, there’s definitely a lot of jargon that is thrown around, depending on your particular specialty. Set time, slump te...
What’S The Process of Creating A Takeoff?
Takeoffs can be made in a number of different ways. Many contractors are still pouring over paper blueprints, counting each outlet box, run of wire...
Can I Use Digital Tools instead?
Other contractors will use a digital copy of the blueprints, which allows them to zoom in on areas of interest and quickly scan other areas that ma...
How Can I Spend Less Time Completing A Takeoff?
A third option that many contractors are finding more efficient is an integrated estimating programs. Instead of simply looking at existing digital...
What is a reducing plenum system?
reducing plenum system uses a trunk reduction periodically to maintain a more uniform pressure and air velocity in the trunk , which improves air flow in branches and run outs closer to the air handler. Similarly, a reducing trunk system reduces the cross-sectional area of the trunk after every branch duct or run out, but it is the most complex system to design. A properly designed reducing trunk system represents the ultimate in an engineered duct system with each portion of trunk duct specially sized so that the trunk is proportionately reduced after each branch takeoff. The system is well-balanced since each branch is specifically engineered but is more costly than other standard duct systems because of custom nature of design, ductwork and installation. Note this is not to be confused with the reduced extended-plenum system described above.
Why are transfer grilles installed?
In order to keep supply air from pressurizing closed rooms, transfer grilles or jump ducts are installed to equalize the pressure and allow conditioned air from supply duct to flow evenly back to the central return grille. This is especially important for rooms without return registers.
What is a distributed return duct system?
In a distributed return duct system, each room has a return duct that provides a pathway for air to flow back to the air handler. In a central return duct system, or whole-house return, return grilles are located in central locations on each floor, usually close to the air handler. Traditionally, central returns have been less popular than distributed returns because of privacy problems and noise transfer. A correctly installed central return duct system however exhibits none of these issues. Central return duct systems are the better choice in duct system design due to following reasons:
Why are ducts more efficient than unconditioned?
If located within conditioned space, conductive and radiative losses, leakage losses, and equipment cabinet losses are reduced or regained into the building space. Also, ducts located inside the conditioned space need minimal insulation (in hot and humid climates), if any at all. The cost of moving ducts into the conditioned space can be offset by smaller heating and cooling equipment, smaller and less duct work, reduced duct insulation, and lower operating costs. There are several methods for locating ducts inside the conditioned space.
What is duct system?
Starting with the basics, let's start at the most elementary level by identifying components of a duct system. A duct system is a network of round or rectangular tubes —generally constructed of sheet metal, fiberglass board, or a flexible plasticand- wire composite—located within the walls, floors, and ceilings. Usually, you can see only the outlet, which is a register covered with grillwork.
Why do you need ductwork?
Most air conditioning and heating systems require some form of duct work to channel or direct the air to places where the conditioned air is needed. There are many types of ductwork available and often times the ductwork can make a big difference in your utility bills. For that reason, it is important that the ductwork is designed and installed correctly. A poor installation job will result in poor performance, bad air flow, leaky duct systems, and higher than usual utility bills. Another important factor in the installation process is to make sure the duct work is sized properly. Over sizing systems cost more and does not maintain the desired air flow and undersized duct work causes the system to strain mechanically and can be noisy.
What is construction takeoff?
Construction takeoffs are a crucial component of any construction project. An accurate takeoff gives both the client and contractor a firm outline of the total material cost for a project. Depending on the project’s size and scope, construction takeoffs can vary from relatively simple to incredibly complex.
What is the final product of a construction material takeoff?
The final product of a construction material takeoff is the total material cost for a project. Because of this, the construction takeoff is essential for the overall estimating process.
Why do we use digital takeoffs?
While the process isn’t a simple one and can be time-consuming, digital takeoffs help ease the workload and provide better accuracy than a manual takeoff.
Why is material take off important?
An accurate material take-off is essential for arriving at an accurate estimate for the cost of a project.
What materials are needed for a material takeoff?
Material takeoffs include all of the raw materials you’ll need for the project, such as wood, rebar, piping, and concrete.
What are the challenges that many contractors run into when creating a construction takeoff?
One of the challenges that many contractors run into when creating a construction takeoff is figuring out what is included in a takeoff.
Is a construction takeoff comprehensive?
It is important to note that while a construction takeoff must be comprehensive, certain items generally aren’t itemized in a granular fashion. For example, a construction takeoff won’t include the exact number of screws or nails required for a project.
