A Page 2 Ducting Dos and Donts YES NO Smooth Duct Smooth Gradual Turn Proper Combining of Two Ducts Flexible Duct Sharp Angled Turns Improper Combining.How to Calculate Kitchen Range Hood Fan Size.Kitchen range hoods that are vented to the outside are a great way to remove heat, odors, moisture, and smoke from your home when cooking. Adobe Acrobat Pro 8 Keygen Download Mac . The fans in range hoods are rated by the cubic feet of air they move per minute CFM, and its important to buy a range hood that moves enough air to be effective.Below are several different ways to calculate the CFM for a range hood.Range Hood Fan Size.The basic rule of thumb when determining the fan size of a range hood is that it should move a minimum of 1.CFM of air for every 1.So if you have a 3.CFM of air 2. 5 wide stove x 1.CFM minimum range hood fan size.Room Size. You should also take into account the size of your kitchen in cubic feet when calculating the size range hood fan needed, since a larger kitchen needs more venting to clear the air than a smaller room.A range hood should be able to exchange the air in the kitchen at least 1.For example, if your kitchen is 1.To find the fan needed for your size kitchen, multiply the number of cubic feet in the room by the number of air exchanges 1.For example 2,0. CFM range hood fan or higher.An easier way to make the calculation above is to divide the number of cubic in the room by four minutes 2,0.CFM range hood fan or higher.Gas Stove. The burners on a gas stove produce a lot more heat than those on an electric range, so a kitchen with a gas stove requires a larger capacity range hood vent fan.To calculate the fan sized needed for a gas stove, combine the BTU ratings for all the burners on your stove gas burners range from 5,0.BTU per burner, with an average of about 1.BTU per burner and a total of about 4.CFM needed for a kitchen with a gas stove.For example 4. 0,0.BTU gas stove 1. CFM range hood fan or higher.GE JV960SCBR 36 Inch Under Cabinet SlideOut Range Hood with 300 CFM Internal Blower, Variable Speed Fan Control and Cooktop Light Brushed Aluminum.Installing Ducting For Range Hood' title='Installing Ducting For Range Hood' />Range Hood Ductwork.The size, shape, length, turns, and cap on the range hood ductwork adds resistance which reduces the amount of air the vent fan can move, requiring additional CFM for the fan.When using smooth, round 8 diameter, metal pipe, add one CFM per foot of pipe, plus 2.CFM for each elbow, and 4.CFM for a roof cap.For example, if the vent pipe was 1.CFM more to the fan size ratings above 1.Installing Ducting For Range Hood' title='Installing Ducting For Range Hood' />CFMCalculating Range Hood CFM Vent Fan Size.To make the final calculation, take the larger of the CFM rating for stove width, room size, and stove burner.Add the additional CFMs needed for the ductwork to arrive at the minimum CFM range hood to buy.In the examples used above, if your kitchen has a 3.CFM minimum in a 1.CFM minimum, and a 4.BTU gas stove 4. CFM minimum you would want a fan rated at 5.CFM or higher, plus 1.CFM for the ductwork for a total of 6.Common Range Hood Installation Mistakes.Your new range hood is an important part of the kitchen, and an expensive investment.Lets make sure it looks and works its best, by avoiding the mistakes listed in this article.Theres also a bullet point summary on the bottom.Phase 1 Receiving Inspection.Its a good idea to inspect your new range hood as well as other appliances and home electronics as soon as you receive the shipment.This way, if theres a problem shipping damage, missing parts, etc, it can be resolved within the appliance sellers and the shipping carriers timeframes.Also, not waiting till the last moment will avoid problems with waiting for a replacement, which can mess up your renovation timeframe.Even though every Futuro Futuro range hood is individually inspected prior to shipping, and is specially packaged to withstand the rigors of shipping systems, shipping damage does happen once in a while.Letting us know about it as soon as possible lets us take care of the problem as soon as possible.Before installation, its a good idea to plug in the range hood and check its function.That seems like a common sense thing, but in the flurry of activity surrounding a kitchen upgrade, its easy to forget it.All Futuro Futuro range hoods are equipped with a USCanada standard 3 pin 1.Simply plug in the hood, and check the function of the blower and lights.This way, youll know its 1.During inspection, you may notice that some parts of the hood such as the vertical chimney look like theyre painted white, instead of stainless steel.This is a protective plastic film thats designed to reduce the chance of scratches during installation.Dont remove this film until installation is complete.Phase 2 Planning For Installation.Ducted or DuctlessRange hoods can be installed in 2 configurations ducted vented or ductless ventless or recirculating.In a ducted installation, a duct carries the air from the range hood to the outside of the house in a ductless installation, the air is scrubbed by an additional set of charcoal filters, and then returned to the kitchen.Whenever possible, its recommended to connect a range hood to an outside duct.Not only will this result in better performance compared to ductless installations, but also lower noise.Ducted Installation.You should always follow the manufacturers recommendations for the duct size and type when installing a range hood.Connecting a range hood to a smaller duct than specified will lead to loss of performance, and may even cause overheating problems leading to mechanical failure.Almost all high performance range hoods require the use of rigid ducting.The reason is simple flexible ducting has ridged walls, which create turbulence.Instead of a smooth stream, the airflow is randomized, causing loss of performance and additional noise.Conversely, a rigid duct has smooth walls which help to keep the airflow laminar, which is especially important for range hoods that extract more than 2.Flexible ducting is also susceptible to cracking and rupture, which could cost hundreds of dollars to locate and repair.Rigid ducting may be slightly more expensive and a little harder to install, but its the right way to go.Also, many local building codes require the use of rigid ducting for kitchen ventilation.In a ducted installation, charcoal filters should not be used.Ducted Installation Outside Discharge.One of the most serious mistakes in range hood installation is terminating the duct in an enclosed space, e.This will cause the range hood to operate improperly if it operates at all, due to the back pressure from the enclosed space.No matter how big the space is, air wont be compressed range hoods are high airflow devices, not high pressure.In addition, venting warm moist air from the kitchen into attic space is a recipe for a major mold growth problem.If the range hood doesnt suction air after installation, or you actually feel air blowing out from the filter surface definitely check the ductwork.Ducted Installation Duct Caps Roof Caps.An outside duct that exits through a side wall should end with a duct cap, while roof mounted ducts are sometimes terminated with a U shaped elbow, allowing the air to exit while keeping out the rain and snow.Make sure the cap is the same sizediameter as the duct using a smaller cap will cause problems with airflow and static pressure.Some installers think its OK to terminate a 6 inch duct with a 4 inch cap.OK. Not even close.Regardless of the type of termination, its important to have a damper also called backdraft or airflow controller at the end of the duct.The damper keeps outside air from back flowing into the duct, as well as keeping out unpleasant surprises in the form of birds, insects, and squirrels.Its a good idea to check the condition of the duct cap at least once every couple of years make sure its not clogged, and the louvers andor backdraft operate freely and smoothly.Ductless Recirculating Installation.Although its always recommended to connect the range hood to an outside duct, there are situations where this is simply impossible.Many high rise condominiums and co operative buildings prohibit any modifications that pierce the outside walls of the building.Ultra modern condos with concrete ceilings and floor to ceiling glass windows also exclude the possibility of an outside duct.The solution is installing the range hood in ductless, also called recirculating mode.In this situation, in addition to the metal filters that absorb the grease droplets, the hood uses charcoal filters aka carbon filters to absorb odors.After the air has been de greased and de odorized, its released back into the room.If you intend to install your range hood in ductless mode, you would also need to Order charcoal filters sold separatelyMake sure the charcoal filter is installed in the hood.Change the filter every 6 months.One of the most important things to keep in mind with ductless hoods, is that the charcoal filter should be changed regularly.Eventually, it becomes clogged with grease and odor particles, and will restrict airflow, which could cause the blower motor to overheat and fail prematurely.If you cant replace the charcoal filter, its actually better to remove the it, than to operate the range hood with a clogged filter.Replacement filters are available on our website, in the Range Hood Accessories category.Note that there are 3 types of filters Electrical.The 2 most important considerations for the power connection to the range hood are dont cut the plug, and make sure the hood is connected to a dedicated line.Dont Cut The Plug.One of the most common problems with appliance installation is the electrical connection.The rule of thumb and the UL regulation, BTW is simple if an appliance comes with exposed wires, it must be hardwired if it comes with a plug, it must be plugged in.Following this rule will avoid problems with manufacturers warranty, as well as potential issues with inspection.All Futuro Futuro range hoods are equipped with a power cord that has a USCanada standard, 3 pin grounded, 1.Some installers like to save a few minutes versus installing an outlet and cut the plug splice it directly into the electrical line instead.Dont let them do thisNot only is hardwiring a bad idea from the viewpoint of regulations and inspection, but if theres a need to service the range hood, the technician must be able to disconnect the hood and plug in the diagnostic equipment.If the hood is hardwired, only a licensed electrician is allowed to modify the wiring.Avoid this problem by making sure the plug is not cut and the hood is plugged into an outlet.Dont Share The Line.Another good rule to follow is connecting each major appliance including the range hood to its own separate dedicated electrical line.Its not a question of amperage or load on each wire, but rather ensuring that each appliance does not interfere with the others by causing voltage drops or introducing electrical noise into the line.Devices like gas stove ignitors, refrigerator compressors, and microwave magnetrons, can place a momentary but significant load on the circuit.Mixing and matching different devices on the same line is never a good idea, but especially so when one of the devices is equipped with sensitive electronics or lighting transformers.
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