BRID XXL

CADR was developed by AHAM (Association of Producers of Domestic Appliances), in the early 80s, it outlines a method used to measure clean air output-speed. It also measures the ability of a device to reduce smoke, dust and pollen particles in a room.

Why CADR is no longer a suitable parameter to evaluate air purifiers

CADR was designed when air purifiers followed one principle: blocking pollutive particles that moved towards a filter by fan suction. To this day many different and new filtration technologies are available, as a result, we should distinguish the difference between filters which simply block particles that those such as BRID which destroy them.

CADR is not a suitable parameter because:

- It ONLY APPLIES TO PARTICLES (smoke, dust, pollen) and NOT GASES. Smoke particles, dust and pollen are NOT THE ONLY pollutants found in a domestic environment. Many other substances exist which pollute the air such as carbon monoxide, volatile organic compounds (VOCs), ozone, sulfur-oxide, nitrogen-oxide and other such substances which can not be counted as particles and are not measured by the CADR parameter.

- It only demonstrates the ability of a filter to block particles, but provides no information regarding how effective it is at destroying pollutants.

- The efficiency of the filter is calculated solely based on a single passage of air through the filter.

- A filter which blocks particles can become a habitat for bacterial cultures and molds, causing said pollutants to diffuse in the air, putting human health at risk.

- Even if the physical filters can stop large particles of pollen, smaller particles which cause allergies can often pass these filters and can be further diffused in the breathable air around the filter.

- CADR depends on the air-flow of the purifier. Paradoxically, a filter capable of
generic filtration slows the air-flow as it passes through, reducing the resulting
CADR.
- It uses a 28.5 m^3 room, in which measurements are taken as the filter is in operation which does not take into account spontaneously decaying particles.

- CADR measures particles which are left in the air, not ones which have been trapped.
- Filters based on ionization technology tend to cause errors, ionization can cause particulate matter to stick to walls and pavements, as a result they remain in the room without being eliminated permanently from the breathable air.