What size ducts do radon fans need?
In the HVAC world, fans are always placed on a specified duct size (4″-10″+). Manufacturers can accurately predict how much cfm an inline fan will move in these ducts. However, with radon fans, you’re at the mercy of soil conditions, sub slab fill, suction pit sizing, and much more.
How many CFM do I need to run a fan?
Manufacturers rate fans by CFM. CFM stands for cubic feet per minute so an electrical fan with a 1,500 CFM rating will push 1,500 cubic feet of air per minute. Follow this general guideline: 1,250 cfm for a 4-cylinder
Do radon fans need a U tube reading?
However, with radon fans, you’re at the mercy of soil conditions, sub slab fill, suction pit sizing, and much more. Meet the fan curve: Fan curves tell you how much cfm you’re moving at a given resistance or suction (measured in inches of water column pressure). This is why you’ll often hear us ask you for a U tube reading.
What size PVC pipe do you use for radon ventilation?
These are the vent pipe sizes we typically use based on cubic feet per minute (CFM). If it’s under 40 CFM, we might use 2-inch diameter PVC pipe. Under 70 CFM, 3-inch pipe. If it’s over 70 CFM, we’ll use 4-inch pipe. After we install the vent pipe, we then attach the radon fan that meets the specifications we calculated earlier.
What size radon fan should I use?
Radon Fan Types by Total Foundation AreaPIPE SIZE NominalLess than 1600 sq. feetGreater than 2500 sq. feet4 inchUse Radon Fan Type: RP140, RP145, XP151 , XP201 Minimum rating:* 50 cfm @ 0.5″ WC [85m3/hr @ 125 Pa]Radon fan to be sized by a certified/licensed radon mitigator1 more row•4 Nov 2021
Should my radon fan run constantly?
Your radon fan should never be turned off. It should constantly be running in your home to ensure that the system is working properly. After a radon system installation, a post-mitigation test for radon should be performed within 30 days of install.
What is the most powerful radon fan?
Rn4EC-4 Radon FanRn4EC-4 Radon Fan is the most powerful product on the market for active radon mitigation applications where high suction and high flow are required. It is an excellent solution for high radon levels, poor sub-slab communication, multiple suction points and/or large sub slab footprint.
Does airflow reduce radon?
By increasing airflow in a basement that is not properly sealed, you suck more radon out of the ground through the basement, which means more radon ends up in the home.
Are radon mitigation fans noisy?
If your radon fan is making a loud humming or whirring noise, there's a chance that it needs replaced. Most fans last 5-10 years, with some making it up to 20. However, it's not uncommon for them to get very loud before they finally quit. If your fan is abnormally loud, check your manometer.3 Feb 2021
How often should you run a radon fan?
Your fan needs to run continually, so don't turn it off or unplug it. We recommend you check your U-tube once a month to ensure that the fan is working properly. After that, re-test every at least every 2 years to ensure safe levels.
How long do radon fans last?
Radon fans are a vital part of the system and since they are electronic they are more susceptible to a wide range of problems. Most fans only have a 5 year manufacturer's warranty but they often last 20 years or more. However, that is only if the fan is allowed to run continuously at low power.5 Sept 2019
Are home radon detectors accurate?
The National Radon Safety Board evaluates radon measurement devices in cooperation with the US Environmental Protection Agency. It requires that the individual relative error of each device be less than or equal to 20.0% and that the precision error of all devices be less than or equal to 20.0%.22 Sept 2008
Does HRV reduce radon?
A heat recovery ventilator (HRV), also called an air-to-air heat exchanger, is installed to increase ventilation, thereby reducing radon levels. A high performance HRV can provide comfortable, continuous, balanced ventilation for the entire home.
Does HVAC remove radon?
This study shows that even the most standard ventilation provided by an HVAC system can reduce levels. The impact of radon is statistical and improvements can continue to be gained at levels below the current 4.0 pCi/l action level.
Does opening windows reduce radon levels?
Does Opening the Windows Reduce Radon? Unfortunately, no, opening the windows does not reduce radon. It is not a gas that will just permanently escape the home like smoke from something burning in the oven. The radon may seem to leave when the windows are open, but as soon as they are closed, it is back.24 Aug 2020
Can you run a ceiling fan during a radon test?
Turn off all air moving devices during the test. This would include ceiling fans, dehumidifiers, regular fans, HEPA or any other kind of filtering device that moves air. Do not operate fireplaces or heating stoves during the test unless they are your main source of heat.
How Do We Choose Which Radon Fan to Use?
Good question! We test and measure. Often the key to getting your radon levels really low, is to create suction under your entire home. Therefore, by measuring both the pressure and the airflow we can determine the number of suction points, the size of the vent pipe and which fan is right for your home.
Why is it important to choose the right radon fan?
Knowing how to choose the right radon fan is important, because it’s a large factor in how effective your radon mitigation system is at reducing your family’s risk to lung cancer. Get Your Free Radon Mitigation Estimate.
How Is Airflow Measured?
Once we do diagnostic testing to figure out where the best location for your suction point is, we create one. To do this, we core a 5-inch hole through the floor and remove 5 to 40 gallons of material. As a result, we have a void, with a lot of surface area, for the mitigation system to draw from. If you have tight soil, your suction point should be larger. In other words, the harder the digging, the larger the suction point needs to be. Clay soils, for instance, need very large suction points because they are very hard to draw air through.
How to get radon levels down?
Often the key to getting your radon levels really low, is to create suction under your entire home. Therefore, by measuring both the pressure and the airflow we can determine the number of suction points, the size of the vent pipe and which fan is right for your home.
Why do you seal radon holes?
Openings to the soil should be sealed whenever possible, so that the radon system isn’t drawing conditioned air (air you are paying to heat and cool) out of your home. A radon system that draws too much air from inside your home can cause appliances like your water heater to backdraft.
Why do radon fans need to be moved?
This is because radon fans need to move a small amount of air in order to stay cool and prevent them from overheating. When we choose the radon fan, we are careful to ensure that it doesn’t exceed the manufacturer’s maximum recommended operating pressure.
What are the manufacturers of radon fans?
There are many radon fan manufacturers to choose from, but the big three are RadonAway, Festa, and Fantech.
High Suction Fans
In contrast, with tight soils like clay and sand it’s best to use a high suction fan. If the soil below your home is tight, you may sometimes need more than one suction point to create vacuum under your whole house.
SYSTEM DESIGN CONSIDERATIONS
1.FAN SEALING. Pro Series Fans are factory sealed; no additional caulk or other materials are required to inhibit air leakage.
How much air does a fan push?
CFM stands for cubic feet per minute so an electrical fan with a 1,500 CFM rating will push 1,500 cubic feet of air per minute . Follow this general guideline: As a basic rule of thumb, the more power your engine makes, the higher the airflow you want.
How does a fan draw air?
The more current a fan draws, the more airflow it will have. A more powerful electrical fan can draw air through multi row radiators and air conditioning cores. Make sure to get a high performance electric motor that is sealed and prevents contamination from dirt and water. This ensures worry-free performance for years to come.
How does a mechanical fan affect engine efficiency?
Mechanical fans also rob your engine of horsepower and fuel economy since they are driven off the crankshaft. They simply can’t compete with electrical fans when it comes to efficiency. A radiator only works if there is airflow through the radiator core. An electrical fan provides constant airflow even when the engine is idling, ...
How to get air through radiator core?
To get maximum airflow through your radiator core, you should use a fan shroud. A fan shroud ensures that air is moving through the radiator core and not around it. A radiator is useless without airflow, a fan shroud helps direct air through the core. Make sure you use one in your vehicle.
What is the difference between curved and straight fan blades?
Straight and curved fan blades come down to a difference in noise versus airflow. Straight blades move more air but are noisy. On the other hand curved blades are quieter but don’t move as much air so it all depends on your application.
Do you need a single fan?
Most of the time a single fan is all you need but if you have added a much larger engine or are making big horsepower, then you may want dual fans to maximize the amount of airflow. If you’re not having a problem with overheating, then a single fan will suffice but if you have made significant upgrades such as a turbo or supercharger then dual fans will help provide the additional airflow needed.
Can you use a relay kit on an electric fan?
Be sure to use a relay kit when wiring an electric fan. We have relay kits designed to integrate with OEM wiring. Choose a relay kit with or without a stainless steel electronic sending unit. Sending units offer hands free control of your electric fans, simply choose a sender with the on/off temperatures that best fits your needs.
What is the CFM required for a whole house fan?
CFM required for the whole house fan = Volume of air movement in an hour/60 (form 4)
How many air changes are needed for a CFM?
According to Energy.gov, the maximum number of air changes needed is 6. So if we do the math based on that, then the CFM required, in this case, would be 1600.
What is the importance of geographical location when deciding the CFM rating for a whole house fan?
Whole house fans cool the house by drawing cool air from the outside. In cool climates, the inside temperature can be lowered by a few air exchanges whereas if your home is in a hot climate area the number of air changes needs to be more. So having a larger fan in hot climate areas make sense.
How many cubic feet of air are needed to move in an hour?
So, total air that need moving in an hour = 3 x 16000 = 48000 cu.ft
How many cubits of air does a 2000 sq ft house need?
So if you have a 2000 sq.ft house with an average height of 8 ft then the total volume of air that needs changing is 16000 cubit ft.
How many air exchanges does Quietcool use?
QuietCool, a very popular brand in this industry, recommends 15 to 22 air exchanges for effective cooling. Here is a size guide recommended for Quietcool whole house fans; Source: conservationmart.com/specs/whole-house-fan-sizing.pdf.
How to find the volume of air in a house?
The volume of air in a house (Cu.ft) = Sq.ft area of the house x average height of the ceiling (form 2)
