Phone    03 8560 2111

Manufacturer of premium quality ducted air purifiers

purely for your health


Phone 03 8560 2111

Disclaimer    Copyright © Sanctuary Air Victoria 2015

How to choose an air purifier

How to choose an air purifier

​​Sanctuary Air SA-250 Series

​Indoor Air Pollution Fact Checks

Manufacturer of premium quality central air purifiers

Figure from FILTRATION OF AIRBORNE MICROORGANISMS: MODELING AND PREDICTION, W. J. Kowalski, M.S., P.E., ASHRAE Student Member, W. P. Bahnfleth, Ph.D., P.E., Member ASHRAE, T. S. Whittam, Ph.D., Copyright © 1999 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.

Indoor Air Pollution Fact Checks

  Purely for health



​​Sanctuary Air SA-250 Series

  • How do I purchase a Sanctuary Air Purifier?

  • What are the benefits of owning a home air purifier?

  • What are the advantages of Sanctuary Air ducted purifiers?

  • How many rooms can the SA-250 cover?

  • Our primary heating/cooling system is located in one room. Can the SA-250 act as a warm air mover, distributing warm (or cool) air to other locations?

  • Can the SA250 be integrated into my existing central ducted HVAC system?

  • HEPA filters are specified at 0.3 microns. Can a HEPA filter remove particles smaller than 0.3 microns?

How do I purchase a Sanctuary Air purifier?

  1. Contact us by phone or email to express your interest and answer a few simple questions about your home or office: number of rooms etc. in our questionnaire.
  2. We will provide a preliminary quote based on your answer and arrange an obligation free assessment at your premises to fine tune the solution, for example, position of outlets etc.
  3. Once you are satisfied with the package and have paid a deposit,  we arrange for our Sanctuary Air approved installer to visit at your convenience. It takes a single working day to complete the task. After this, the air in your premises can be purified 24/7 at the press of a button.

What are the benefits of owning a home air purifier?
A capable home air purifier solves indoor air quality issues. A home air purifier is an investment in good health, reduced healthcare cost, better sleep, less sick leave, and higher productivity. You will notice less dust accumulation which means less time spent cleaning. Air purifiers also protect valuables from the destructive effects of pollutants.

Home air purifiers make homes healthier. They provide a clean smelling environment and allow for clearer breathing. For those who live in particularly polluted environments, they restore particulate concentrations to safe levels. The return outweighs the cost of ownership. 


What are the advantages of Sanctuary Air ducted purifiers?
There are many advantages.

  • Ducted systems purify all occupied spaces so that each person spends more time in a clean environment,
  • They produce far less noise: absolutely essential for undisturbed sleep,
  • Less maintenance due to large long life filters,
  • Positive pressure: Simply closing the door can thoroughly your control indoor air quality by gently pressurising against infiltration of contaminated air from outside,
  • Ducted systems consume no floor space
  • Easy access to filters without entering the loft.

How many rooms can the SA-250 cover?
Eight standard rooms (3m x 4m x 2.4m) with 3.5 air changes per hour.

Seven standard rooms with 4 air changes per hour... etc.

Our primary heating/cooling system is located in one room. Can the SA250 act as a warm air mover, distributing warm (or cool) air to other locations?
Yes absolutely! Whether you have a wood heater, wall split R/C, or gas room heater, we can locate the SA250 air inlet near your primary heating/cooling unit, converting it to a central ducted system. Green rated R1.5 or R2 ducts are used for energy efficient heat transfer, and in the case of wood heaters, we not only duct your warm air, we remove benzene and PAHs (Polycyclic Aromatic Hydrocarbons in smoke) in the process.

Can the air purifier connect to the outlets from my ducted heating system or are new outlets needed?
We can connect to your existing outlets which generates cost savings we can pass on. If the pre-existing ductwork is quite old, we can replace main ducts and with new energy efficient ducts, to generate heating/cooling energy savings.

HEPA filters are specified at 0.3 microns. Can a HEPA filter remove particles smaller than 0.3 microns?

Yes. Genuine HEPA filters are very

efficient at removing particles much smaller

than 0.3 microns by a well known and studied

process called "Diffusion". Diffusion is

the result of gas molecules colliding

with ultra fine particles, which causes the

particles to "zig-zag" instead of travelling

in a straight path, similar to Brownian

motion in gases. By zig-zaging about,

the particles almost always impact and

attach to HEPA fibres. See Figure 1


It is only when particles approach

molecular size that the HEPA filter becomes

unsuitable due to the vast number of gas

molecules and the huge filter surface area

required. Instead an Activated Carbon Filter

is used to adsorb the remaining molecular

sized pollutants. One gram of activated

carbon has a surface area between 500

and 1500 square meters and can adsorb

50% of its own weight in gases.

HEPA filters are specified at 0.3 microns

for good reason. In accordance with laws

of physics, the diffusion effect is relatively

weak for particles 0.3 microns and larger,

so filtration of these larger particles depends

mainly on the "sieving" action of the filter

media, or how fine the filter media is.

0.3 microns is near the filter's weakest point,

known as the Most Penetrating Particle

Size (MPPS). As such, it is internationally

recognised that specifying at 0.3 microns

provides a meaningful description of filter performance.


Some filter manufacturers specify outside the MPPS range, instead choosing a favourable point within the diffusion regime, 

thereby creating an impression of being equivalent or better than HEPA. Doing so is not in compliance with internationally recognised measurement standards, and the reality is that such filters are usually not genuine HEPA filters and may fall short of HEPA performance, in some cases well short.