One of the most useful modifications you can make to your vacuum is to extend the length of the hose. This is useful for a number of reasons, including keeping your vacuum exhaust out of the work area or simply a longer reach. Here we discuss some basics on hoses and what to know when extending your vacuum hose.
A Scientific Disclaimer
Firstly, let us give a full disclaimer: the measurements in this text are in imperial, rather than metric, units. If you are any sort of scientist, you know that this is opposite the correct scientific way to provide measurements; however, since most vacuum hoses in the United States are measured imperially, we will provide this information in feet and inches, rather than meters and centimeters. These same results for air flow can be evaluated in the metric system with the same results, assuming proper conversion of units.
Adding Hose Lengths
Most typical vacuum hoses come in 8 foot, 10 foot or 12 foot lengths, depending on your manufacturer. When combining vacuum hoses, you can actually combine hoses for a total of 35 feet without losing any noticeable suction. This can essentially triple or even quadruple the length of your reach with minimal effect on vacuum suction. The way to do this is:
- Determine the outside diameter (OD) of the vacuum cuff your hose currently has.
- Determine the outside diameter (OD) of the new vacuum cuff.
- Search for a hose coupler which has the same OD as your vacuum cuffs.
Once you have the necessary components, this is generally the flow:
- Vacuum + hose + coupler + hose
Will I Lose Suction With A Longer Hose?
Yes and no. The longer the vacuum hose, the larger the volume is of available hose space. Because volume and pressure are inverse variables, if the volume goes up, the pressure – or in this case available air flow – goes down.
Due to increased internal friction, each foot of hose length you add decreases working airflow at the end of the hose. The amount lost is affected by the vacuum’s static suction, airflow, as well as the diameter and internal geometry of the hose. A smooth bore hose will lose less suction than one with internal corrugations.Brent Willson, Product Manager at Dustless Technologies
However, in using our vacuums in particular we have found that although adding length will slightly reduce suction per amount added. On our 1.5″ Crush-Proof yellow hose, we have found that adding 12.5′ of hose decreases the CFM by about 7%. Thus, once you have added three of those hoses, or around 36′ of hose, you will be down 21% on suction. As you can see, anything past 36′ will have a noticeable impact on your suction. This is different for different vacuums and hoses, and will be much different on industrial vacuums which have a higher CFM to begin with.
When Adding Hose Can Be Beneficial
There are several circumstances when adding a longer length of hose is extremely beneficial.
First, working in hazardous environments. Vacuums exhaust clean air, but that clean air will still stir up dust in your environment. We recommend longer hoses so that you can place you vacuum in a separate room or location, and take less into the work space.
Second, working in places where it is not plausible to haul your vacuum around. This is true for places like cramped attics or small crawl spaces where running a hose is easier than lifting a vacuum.
Third, when you are moving around to several different locations. Let’s say you are cleaning up slurry from drilling sites that are spread out. This is where more length can have utility, because you don’t have to bring the vacuum to each location.
Lastly, just for general ease of use. Unless you are gauging the CFM of your vacuum and strict on how well it performs, any noticeable lack of suction will probably be more than made up for in convenience.
What We Recommend
We have two products we highly recommend.
First is our Universal Crush-Proof Hose, 25′. It is universal to most major vacuum brands, extremely strong, crush-roof, kink-proof, and overall probably will outlast your vacuum. It comes with a coupler, so if you already have a 2.25″ hose – voila, you can connect them together.
Second is our Y Connector Kit. It comes with the equipment necessary to hook up two regular wet+dry vacuums so you can effectively double the CFM out of your vacuum system.
Have any questions? Our team would be glad to help and find answers to any question you have. Simply give us a call at (435) 637-5885 and ask for our sales team!