When a vacuum manufacturer claims that their vacuums feature “no loss of suction,” it doesn’t really mean anything when comparing vacuums! They are often talking about “sealed suction.” Sealed suction is measured with the air intake completely closed and no airflow.
With no airflow, none of the dirt will make it from the vacuum head to the vacuum bag or container. So airflow is just as important if not more important than whether the vacuum claims to have great “no loss of suction” capability. Whether a vacuum is going to pull the most dirt from your carpet or not is really a combination of sucking power plus airflow. Many vacuum manufacturers now make “no loss of suction” claims, but most of them also lose airflow!
What about vacuums that can lift a bowling ball? Don’t they offer the most powerful suction? Won’t they do a better job of cleaning my carpet? Lifting a bowling ball with a vacuum is really a parlor trick. The simple suction of a suction cup can lift weights greater than a bowling ball without any power at all. It is the suction connection and not the suction power that carries the weight. Vacuums that advertise that they can lift a bowling ball are just trying to dazzle you with hype.
If you cover a vacuum’s filter with dust, the vacuum will clog and stop the airflow. So no matter what the claims are about a vacuum’s “no loss of suction” capability, in the end they all clog and stop vacuuming. What you need is a combination of suction power and airflow to insure you get a vacuum that will meet your cleaning needs.
Airflow is an important specification to compare when choosing a vacuum cleaner. Airflow is typically measured in cubic feet of air per minute (CFM) and measures how much air is flowing through your vacuum’s system. All other specifications being equal, a vacuum with a higher CFM will usually do a better job of removing dirt from a carpet.
There are other important specifications that you can use to compare vacuums such as water-lift capability and amperage, but loss of suction power is not something you really need to compare.
Compare airflow in CFM and buy a canister vacuum with a specification of 100 CFM or more or an upright vacuum with 60 CFM or more.
A great airflow coupled with your average 10 to 12 amp vacuum will do the job just fine without any hype.