This is a pic of the typical sort of room cooling fan I used to see:
http://www.currys.co.uk:80/images/206877_01_huge.jpg

Standard desk fan.
o Large diameter 7" - 9" - 12" - 16" axial fan
o Axial fan = high airflow + low pressure + low noise


In recent years the tall or tower fans have become popular in the UK.
http://www.argos.co.uk/wcsstore/argo...3UC142112M.jpg

Standard tower fan.
o Long length 12" - 24" radial fan
o Radial fan = high airflow + high pressure + higher noise


Can you compare these two styles of room fan to help me
understand which cools the most for the same level of noise.

In general...
o Go for a 16" axial fan set to the lowest speed
o Auto-oscillate mechanism may need lubing annually re noise :-)

Tower fans...
o Radial fans are good for overcoming resistance of a filter
---- eg, Honeywell / Duracraft HEPA filter fan
-------- filter imposes huge airflow resistance = radial fan/blower used
o Radial fans in tower fans without filters are more for compact size

Axial fans...
o Axial fans are best for high airflow at lowest noise if big rotor
---- eg, 16" desktop fan set to the slowest settings
-------- no filter so no downside to the low static pressure of the fan

One counter is...
o Some tower fans are Honeywell - who do decent fans / HVAC control
---- in some instances you may find their tower fan is a little quieter
o However Honeywell HEPA tend to be noisier - even later quiet models
---- minimum blower speed / noise is needed to overcome the filter

So you may want to ask if you can plug the thing in whilst the assistant
waits.

Realise high airflow across legs can create ache/pains - you want
0.1-0.4m/sec,
depending on how susceptible the person is to such & the actual room temps.

A window blind can be as/more useful than a fan - also available on Ebay :-)

Thanks.
--
Dorothy Bradbury