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However, you can opt for them if you have a small kitchen with space issues. Its more important to ensure you use an appropriately sized duct. Flexible duct for range hood is not allowed by the IRC (International Resident Code).
Some transitions are duct reducers. Due to most of the material being made from either aluminum or plastic, the durability of this duct is relatively low as well.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'airflowacademy_com-box-4','ezslot_1',103,'0','0'])};if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-airflowacademy_com-box-4-0')}; The ductwork is not immune to debris and dust from the outdoors. Awoco RH-DUCT-8 8 Inches Diameter x 6 Feet Long Semi-Rigid Flexible Aluminum Duct - Ideal for Kitchen, Bathroom, Range Hood Venting, Liquid error (sections/main-product.liquid line 231): divided by 0, [2-5/8" Flat Thin Edge] 2 Pcs of 12VDC LED Lights for Awoco RH-C06, RH-R06 and RH-SP06/08 Range Hoods, [2-1/2" Thick Edge] 2 Pcs of 12VDC LED Lights for Awoco RH-IT & RH-BQ Range Hoods, [2-5/8" Thick Edge] 2 Pcs of 12VDC LED Lights for Range Hoods with Recessed Light Holes, Awoco FM35-M Elegant 2 Speeds Air Curtain, UL Certified with an Easy-Install Magnetic Switch, Awoco RH-C06 Under Cabinet Classic 6 High Stainless Steel Range Hood, 4 Speeds, 6" Round Top, 900CFM w/ LED Lights, Awoco 12VDC Easy-Install Magnetic Switch for Awoco Magnetic Switch Controlled Air Curtains (Magnetic Switch), Awoco RH-IT08-M 14-1/2"D Super Quiet Split Insert Stainless Steel Range Hood, 4 Speeds with a 8" Blower Unit, 1000CFM, LED Lights, Domestic delivery time - 4-10 business days. In following this topic on other forums, the consensus is "no" (based upon IBC), and furthermore, once the installer is called back to replace the flex with something that will pass inspection, the performance of the hood magically changes from "noisy but doesn't move much air" to "fantastic and quiet". All Rights Reserved.
For instance, range hoods with a CFM of 400 need around 4 inches of duct for air to pass through freely. Estimated Delivery : Monday 01 August - Friday 05 August. While there is no best method for venting a range hood, its important to ensure there is enough space for said ducting before you begin the installation.
Rigid duct is the most durable and generally made of higher-quality materials compared to flexible duct. You do not want grease, dirt, and chemicals from your kitchen air to build up in your attic. Expansion of duct improves airflow and reduces noise whereas reduction does the opposite. What are my options?
Here is a table to give you an idea of the ideal duct size in relation to CFM: Once you have the size figured out, the next measurement is the length of the duct.
Some semi rigid aluminum (not the cheap foil ones) ducts are fire rated to be used on a range hood. Smaller ducts are less efficient in air disposal as overflow leads to more resistance in the pathway. That's not "smooth wall" as far as ducts go, it's a flex duct. You want your ducting to work efficiently and air will flow quicker and easier with a straight path. Duct work is costly, but it can cost you more if its done improperly. It has a maximum operating temperature of 435 degree F. Assembly Instructions
Therefore, try venting outside and as closely to the kitchen as possible. A range hood should last you 10+ years with minimal repairs or issues. Here are a couple of examples of duct reducers compared. On the contrary, round ducts have no corners so dirt settles at the lowest point in a straight line making it easier to clean. A flexible duct is not suitable because grease and dirt can build up with time and may potentially lead to a house fire. Four-inch duct is too small for most range hoods. I was thinking about something like this: https://www.mcmaster.com/smooth-bore-duct/heat-reflective-duct-hose-for-air/, A collection of one thousand construction details organized by climate and house part. Failure to adhere to this advice will result in back-drafting, which is when the air is pulled back into the kitchen from the hood. Further, make sure that you allow 18 of space between elbows to keep the amount of resistance manageable. This won't delete the articles you've saved, just the list. Aluminum in general is not the best material for ductwork because the material is not as strong as it needs to be.
This maximizes the efficiency of airflow, creating a path of least resistance. It requires a one-time installation and little to no maintenance as long as you clean your range hood filters. Its imperative that you vent your hood to the exterior of your home, not into the attic, into walls, or between floors. rigid awoco aluminum Ducts are not supposed to become smaller. M1503.2 Duct material. Otherwise, you will likely run into problems within a year or even a few months. personalized hardware in the industry. Rigid ductwork is the most long-lasting for your vent hood. However, rigid ducts will remain intact. Accelerate your business's options and take it the next level when you open a credit line with Home Depot Pro. Other than the basic safety reasons, a flexible duct is extremely difficult to maintain and clean. Metal vs Plastic Fan Blades: Which Is Better? All Rights Reserved. You must be a magazine subscriber to access this feature. Dont use a duct smaller than our minimum requirements outlined above! While it will cost you, what you get in exchange is peace and quiet. It reduces the noise of a blower inside the ductwork and allows less air to escape the duct. The duct serving the hood shall have a smooth interior surface, shall be air tight, shall be equipped with a back-draft damper, and shall be independent of all other exhaust systems. Note also that the rough surface of the flex duct is more prone to accumulating oil and dirt from a range hood, and will also be more difficult to clean. I was able to use 8" rigid in a 1950's build masonry house. The minimum duct size for a range hood is 4. The 6 in. Otherwise youll experience back-drafting, where air pulled into your hood falls back into your kitchen this is never ideal! I build homes and we use semi rigid. Simply put, it does not comply with the required ductwork standard imposed by residential codes. Your ductwork should not have more than three elbows. Thank you. These arent necessary, though. Typically, PVC ducts are flexible and made from a material that is vulnerable to the wear and tear that ductwork normally goes through. We are the largest supplier of the most adaptable, CFM is a measurement used to denote the competency of range hoods. PVC duct is not the ideal duct for range hoods because it does not have a steel composition. You can choose from a flexible duct, semi-rigid duct, or rigid duct. Best Real Wood Ceiling Fans For Indoors & Outdoors (Damp Rated), 10 Best Radon Detectors & Test Kits Review. Can't find what you're looking for? Although it does a relatively better job at directing airflow than flexible duct, it still doesnt fully give you the durability youre looking for. However, generally, the company that sold you the hood would also handle the installation process. The Show Only Items Ordered Previously filter helps find your past purchases fast! This list updates each time you open it based on the criteria selected. Flexible duct is a poor investment because it is: Yes, but duct size depends on the CFM of your range hood. These hoods do not require ductwork but are not as efficient as ducted ones. The latter provides better angles of airflow and also has decreased chances of air colliding with the duct.
If you absolutely have to use it, I'd use rigid duct as much as possible, and only use the minimum amount of flex duct in the areas you specifically need it. Like this one: https://www.homedepot.com/p/Everbilt-6-in-x-8-ft-Semi-Rigid-Aluminum-Duct-A068-4-AHD/205046831#overlay.
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Enroll today and take control of where your business will be tomorrow with Home Depot Pro. The elbows that you do have should be spaced at least 18 inches apart. i just tested semi rigid heat resistance over open flame and the thing melted so im going to use rigid duct with 90degree adgjustable elbows.. thanks. Range Hoods. Unfortunately, flexible duct does not come anywhere close to rigid duct in terms of performance and its a risky pick. For example, if you have an existing 4 duct, you can use a duct transition to increase its size to 6. Your range hood should always be vented outside with no exceptions. If youre worried about pests and debris making their way into the duct, consider opting for dampers instead. x 8 ft. Semi-Rigid Aluminum Duct is ideal for bathroom fan and kitchen range hood exhausting. It will allow the range hood as a whole to run more efficiently. You dont want to take the risk either because if things go south, theres a high probability that your insurance wont cover the loss either since you violated the residential code.
Toxic air that is released from your kitchen must be led outside through the vented duct. However, the best ducting for your kitchen hood is rigid. Remember to keep your filters in top shape too, which will drastically reduce the risk of any future issues with your blower or ductwork.
Rigid duct is the best type of duct to vent your range hood. So, the best practice is that ducting should have three elbows at most. Perhaps you have to decide on the type of blades to replace old existing blades in the HVAC system, R19 vs R21 Insulation: Which One To Choose? No. Whether you need it in a rectangular or cylindrical shape, rigid ductwork comes in both shapes to complement your range hood.
Vents have the purpose of directing polluted air from the kitchen to the outdoors. As far as safe and cost-effective options go, rigid ducts are the right choice regardless of how often you cook. x 8 ft. Semi-Rigid Aluminum Duct is ideal for bathroom fan and kitchen range hood exhausting. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'airflowacademy_com-large-mobile-banner-1','ezslot_7',122,'0','0'])};if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-airflowacademy_com-large-mobile-banner-1-0')};Furthermore, rectangular ducts are less effective in directing airflow as compared to round ducts.
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2019 Deflecto, LLC. Although rigid ductwork might cost more than flexible and semi-rigid ducts, its an investment that will serve you for at least a decade or two under timely maintenance. Looks like it is ubiquitous for this use. The purpose of ductwork is to carry odors, dirt, grease, and chemicals out of your kitchen.
I've run semi rigid aluminum (similar to dryer went stuff but larger diameter) for these before without issues. Furthermore, the width of the duct should not be too less as it can cause the air to make unnecessary noise during operation. At the end of the day, you have to maintain your duct, and maintaining round ducts is easier. Item #: Further, it is best practice to reduce the number of elbows in your ductwork. Can I install a ductless range hood outside. A short pathway that has no obstacles and leads outside is the most preferred. of diameter and stretches to 8 ft. L. thanks. Is it OK to vent range hood into the attic? I kept the run as straight as possible, and used rigid ducting the entire way, with just an adjustable angle fitting to make up for some misalignment between the stud wall and the rafters. Why Does A Home Gas Range Not Have To Be Vented? 
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What is the minimum duct size for a range hood?
However, you can only vent an island hood vertically.
Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Additionally, flexible ducts are difficult to maintain. Semi-rigid duct is more durable than flex duct, but rigid duct is the best for your range hood.
How big should the duct be for range hood? We hope these answers to common questions about range hood ducting were helpful for you. This is because rectangular ducts have corners and edges where dust and grease are set up easily. Contact UsPrivacy and Security Statement. Unlike plastic and aluminum, steel ductwork is far easier to maintain.
yeah just tries semi piece of crap aluminum foil.. hahah yeah im going to go buy some 90degree regid duct tomorrow thanks. Rigid duct is the best type of duct for venting a range hood. A Dynamic Favorites List is automatically created from your purchase history based on the timeframe, ship-to name, and product categories you want included. So, you dont want to vent it into the attic or anywhere else other than outside of your home. It has a maximum operating temperature of 435F. If youre going to opt for a larger investment, then you should choose a professional to handle the job to ensure you get the most for your money. According to the code, ductwork must have a rigid inner build. Suitable for general air handling applications like exhaust venting, bathroom venting, range hoods, suspended ceilings and more. As we mentioned previously that grease piling up in the ductwork is common for even kitchens that have minor cooking sessions here and there. It is the most durable and efficient option you have because of its toughness.
Semi-rigid duct is a better version of flexible duct and offers more stiffness and stability in the duct. I had to use 2 elbows with a slip turn on each to get around a light but was able to make it.
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Press question mark to learn the rest of the keyboard shortcuts. An HVAC contractor can handle this task, but a fire suppression company tends to work alongside them. There is best practice in terms of elbows, the fewer the elbows the better the installation. Remember, the shorter the duct, the better the airflow. Why will rigid not work? 
It has a smooth surface and comes in either stainless or galvanized steel, which are the best materials for this job. Wall mount range hoods and under cabinet range hoods can be vented horizontally or vertically, while island hoods can only be vented vertically. Rigid ductwork can be cylindrical or rectangular and is a solid material that is insulation-wrapped. You should not cut down the size of the duct unless theres an absolute necessity. What is the purpose of a transition duct for a range hood? inch aluminum stainless hood range vent kitchenter semi ridgid imperial manufacturing steel kit firebird sensor european mount control akdy az Some of these conditions include the PVC duct being solvent cemented and installed under a concrete slab. /each.
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With the right sized duct, youll maintain laminar flow or the smooth flow of air through your duct. One of the core aspects of finalizing range hoods is choosing which type of duct to go for.
The complete source for building, designing, and remodeling green homes. Due to studs and Plumbing in the bulkhead above the range hood, I cant fit solid duct in a straight line. These tend to be significantly less restrictive than most flex ducts, not as smooth as hard pipe but close enough. Venting a kitchen hood into the attic will allow all of those odors, chemicals, and dirt to accumulate in the attic space which isnt just harmful to your home, but can also be dangerous to your health. Take a look at the graphic below for more information, or check out our full article on range hood duct sizing here. If you vent indoors, youre just temporarily getting rid of the polluted air and compromising the health of your loved ones.
Regular price This duct is totally noncombustible. link to R19 vs R21 Insulation: Which One To Choose? However, semi-rigid aluminum ducts are not recommended because of their low-quality material. Yes, insulated ductwork works great for your kitchen hood.
Though certain areas might allow it under very strict conditions that are rarely met, the verdict remains the same.
conditioning pipe Some of the other options that you have are flexible duct, rectangular duct, semi-rigid duct, and PVC duct. The rough sides (compared to plain sheet metal) result in more flow restriction. While installing rigid ducting to vent your kitchen hood is technically a job you could DIY, it is always wise to enlist the proper trade.
We work hard to ensure you're satisfied with our products. They are a poor investment because they are made using cheap materials, theyre flimsy and frail.
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