MOUNTAIN AIR FILTERS

MountainAir® filters have a very long effective airflow life

MountainAir® filters have initial airflows that are generally superior to other filters. This is due to the very low density of MountainAir® carbon, coupled with a relatively high carbon mechanical strength, which supports a greater level of activation without friability. Equally importantly, the airflow of MountainAir® filters declines at a slower rate than do filters made with other carbons, due to decarboxylation (see ‘MountainAir® carbon’). Because larger plant VOCs are partially broken down prior to adsorption, the pores of MountainAir® carbon do not become blocked as quickly. In other carbons, there is a simple trade off  between airflow and the quality and longevity of filtration, as the carbon bed provides both the filtration and the resistance to airflow. The accurate measurement of airflow is surprisingly complicated, while industry reporting of airflow data are notoriously suspect. Airflow can be measured and presented in numerous ways. Some manufacturers either use crude testing equipment that cannot provide a margin of error, or simply invent data. We have developed an airflow-testing rig, which we believe improves on the current Australian Standard for ventilation airflow testing.

We have introduced to Australian standard # AS29 112 a more efficient baffle and endplate that lessens calibration error, and a second compensatory fan, which has the effect of compensating for the error introduced by the need to compensate for inherent system drag. We conduct all of our airflow  testing in a consistent manner using this world’s best apparatus, and interpret and present the data in a conservative manner, to ensure that our customers have a realistic and accurate expectation of airflow performance. At MountainAir®, we not only meet industry standards, we set them. which we believe improves on then current Australian Standard for ventilation airflow testing.

Filter Design :

 Some carbon filter manufacturers use gimmicks of all kinds to try to attract your attention. One manufacturer provides a conical inner base, claiming that this improves airflow. However, it does not improve airflow. It is a gimmick, useless to man or beast. As air from a centrifugal or mixed flow type fan enters the filter, it does not travel in a vector (or straight line). It travels away from the outside of the fan housing, at an obtuse angle. This airflow mass is yawing and leaves a low-pressure area in the motor shadow. Introducing straight ducting, vaning or baffling to straighten the air also slows the air, and leads to a zero sum gain. In any case, there is a pressure gradient within the filter as air leaves the filter. This is because the filter is flow dependent and not pressure dependent. So in reality, the airflow mass tends to strike the side of the filter, with some air exiting and other air travelling further down before either restriking the filter wall or exiting through the carbon bed. A conical base offers no benefit when air is travelling out through the neck of the filter, and – if air is travelling into the filter through the neck of the filter – it may in fact lead to a drag trap forming as the filter ages.

For this reason, it is not used in any other filter, including in the automotive industry, which has a very great research and development expenditure. It is not a registered design and yet it has not been copied. Other gimmicks to be aware of include the wrapping of filters in plastic. The intended implication of this is that the carbon would otherwise  absorb moisture from the air. However, this is simply not true. We have experience of activated carbon stored in open warehouse piles for fifteen years that had not deteriorated either chemically or physically. At MountainAir®, we box our filters properly, but we decline to wrap them in plastic, as it offers no benefit.

Do not confuse charcoal with activated carbon. Charcoal is carbon based, but is simply burnt coal. It does not have the porous structure of activated carbon, nor the adsorbic capability.

MountainAir® filters are manufactured without gimmicks or compromise.

                                        Size                       Air Flow            Length

4" /  100mm              310m3/hr          400mm

5" /  125mm             500m3/hr          500mm

6" /  150mm             575m3/hr          500mm

 6" / 150mm            1135m3/hr        1000mm

8" / 200mm             740m3/hr           500mm

ALL Mountain Air filters include a pre-filter