The main misinterpretation about power washers is that the pressure (PSI) does all the cleaning. This is correct to an assured degree but too much pressure can easily harm many different surfaces when it comes to exterior cleaning. The rate and cleaning efficiency in essence comes from the gallons per minute (GPM) or flow that the unit puts out. The more GPM the better and faster a unit will clean. This jointly with the right cleaners and lower pressure to eliminate the risk of damage, is an effective plan to clean vinyl siding, wood and other surfaces around your property.
To achieve a lower pressure for exterior cleaning it is necessary to change the nozzle at the end of the wand to one with a bigger orifice. Nozzles are measured and stamped with a 4 digit number. The first two numbers represent the degree of the spray pattern, which most frequently vary from 0 degrees or a pencil like stream up to a very wide 40 degree fan. The second two numbers signify the orifice size or basically the size of the hole that the water shoots from. The larger the orifice is, the less pressure is put out but at the same time the GPM are not affected. An example would be a 4010, this nozzle is a 40 degree spray pattern and a number 10 orifice. A nationally accepted “nozzle chart” is used to compare the orifice size number to the pressure washing units GPM to determine how much pressure is put out. Use this chart to determine how much PSI your unit puts out with a particular orifice size.
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