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Duct Design Diagrams and Pricing
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NEW! Welcome to the duct design studio. This is where balanced comfort design for the life of your home happens. Air distribution is much more than correct duct sizing. The air must move through spaces in designed patterns in order to achieve even comfort.
If the furnace or air handler is the heart of your comfort system, then the duct system with it's various components are the arteries that deliver controlled and equal comfort throughout your house. As you will see below, there are a 3 primary types of duct systems. Review these types to determine what system type might best meet your needs. Please call or email with any questions. 1-877-316-3960, comfyhouse@comcast.net
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Round or rectangular trunk with flexible takeoffs- This is a common system for do it yourselfers or where skilled sheet metal workers are not plentiful. This system has become common for two reasons; people are able to save money and do their own work and contractors keep cost down with less skilled labor.
One hundred percent flexible duct is not an approved design standard within the HVAC Engineering design industry.
While the national fire code prohibits flexible duct connectors longer than 14 feet, The Florida residential building code expressly places no limit on flexible duct lengths. However they also limit the length of flexible connectors.
The drawbacks of 100% flexible are; there is increased resistance to air flow (which decreases system efficiency), they require a higher profile (which can reduce ceiling height or require more branch ducts),a wide turning radius, and in many areas they may not be considered legal.
To my knowledge there has only been one large study on the functionality of primarily flexible duct systems. The end conclusion was that if designed at .05" WC external static pressure and installed properly the systems were functional.
A big advantage of this type of system is that properly insulated duct is as simple as ordering pre-insulated duct and duct sealing components.
Although this method of ducting is easier for unskilled workers to assemble, strict methods must be observed relative to length,radiuses, and proper suspension.
The preferred (our method) lower skilled labor method is to utilize either hard metal round duct or rectangular duct board for the trunk lines and flexible duct for the branch takeoffs.
Systems should utilize a hard metal or fiber duct board plenum on both the supply and return portions of the system.
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Design Pricing $169.00 for each floor up to 1,500 Sq. Ft., Add another $40 for each 500 Sq. Ft. beyond the initial 1,500.
Add another $25 for each system for multiple air handlers.
Tight houses that require an Energy or heat recovery ventilator system should add $150.00.
All duct design diagrams are hand drawn on your medium.
If signifigant scaling, copying, and printing cost is required to deliver a quality prdouct, these cost plus time cost will be passed onto the customer.Hourly rate $50
Pricing is based on assumption that "room by room" calculations have been completed.
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Hard metal round or rectangular trunk lines with hard metal round or rectangular takeoffs- This system is commonly professionally installed by skilled sheet metal workers.
This system is time proven and is limited only by the quality of design and budget.
Flexible duct is used only for the last 5 feet before a diffuser or register. This is approved method within the engineering industry.
The drawbacks of hard metal ductwork is that it is dangerous to install(cutting) and it is expensive. Plus duct insulation is more difficult to install. However if you consider that the duct system is the heart of the homes comfort system for the life of the structure it is still a good investment. It is easier to clean and has more efficient air flow.
Only the best craftspeople with good tools and safety precautions should attempt to install this type of system on their own.
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Design Pricing $169.00 for each floor up to 1,500 Sq. Ft., Add another $40 for each 500 Sq. Ft. beyond the initial 1,500.
Add another $25 for each system for multiple air handlers.
Tight houses that require an Energy or heat recovery ventilator system should add $150.00.
All duct design diagrams are hand drawn on your medium.
If signifigant scaling, copying, and printing cost is required to deliver a quality prdouct, these cost plus time cost will be passed onto the customer. Hourly Rate $50.
Pricing is based on assumption that "room by room" calculations have been completed.
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High velocity Systems- These systems are manufacturer specific and require precise design. The big advantages are that they can operate at higher static pressure and utilize smaller pre-fabricated duct and diffusers.
With proper design a do it yourself installation is possible for a decent handyman.
Another big advantage is that it can be installed in old or new homes where space for ductwork is very limited.
The only drawback that I know of, is that in tight homes a seperate fresh air Energy or heat recovery system is required. There are numerous ways to achieve this.
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Design Pricing $179.00 for each floor up to 1,500 Sq. Ft., Add another $40 for each 500 Sq. Ft. beyond the initial 1,500.
Add another $25 for each system for multiple air handlers.
Tight houses that require an Energy or heat recovery ventilator system should add $150.00.
All duct design diagrams are hand drawn on your medium.
If signifigant scaling, copying, and printing cost is required to deliver a quality prdouct, these cost plus time cost will be passed onto the customer.Hourly Rate $50.
Pricing is based on assumption that "room by room" calculations have been completed.
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