Thermographic imaging enables us to see the warm exhaled air flow and compare the impact of the valve on a respirator.
Inhalation is the cooler part of the cycle; with both valved and unvalved respirators, 3M’s Advanced Electret (Filter) Media (AEM) allows easy inhalation of the cooler external air through the respirator.
As the wearer inhales, air is pulled through the respirator and surface temperature decreases. The valve’s plastic cover retains some of the heat due to the composition of the material.
Exhalation: As the wearer exhales the respirator is filled with warm, moist air. The cooler thermal imaging shades of the picture on the right indicate how the respirator fitted with the Cool Flow™ Comfort Valve allows the air, together with its natural heat, to be expelled more rapidly. As the hot exhaled air exits through the valve, the rest of the respirator remains cooler and more comfortable.
This benefit is ideal for long periods of wear, especially where conditions are hot and humid or when work is physically demanding and likely to cause heavy breathing.
The lower the breathing resistance, the easier it is for the user to inhale and exhale, which should contribute to greater comfort. 3M respirators with the 3M™ Cool Flow™ Comfort Valve had lower exhalation air flow resistance than the 3M unvalved products*.
In the chart to the left, when comparing 9300+Gen3 valved and unvalved equivalent produts you can see the impact the Cool Flow™ Comfort Valve has on the initial breathing resistance
Using a unique manufacturing process, each fibre in the 3M AEM structure is endowed with a very high electrostatic charge. This high level of charge enables each AEM fibre in your 3M filter to attract particles from a wider capture area, efficiently drawing them in and securing them to itself.
The strong 3M AEM charge means less fibres are needed to efficiently capture particles. This enables 3M to construct an effective filter with a much more open structure than conventional electret filters, freeing up the passage of air.
3M™ Aura™ 9300+Gen3 disposable respirators feature 3M’s AEM filter technology: an innovative filter media that helps minimize breathing resistance. This enables high filtering performance with less effort on the part of the wearer, making protection even less intrusive.
In the chart (on the left) you can see the initial breathing resistance of the 9300+Gen3 series relative to the EN 149 standard limit.