|Richards of Hull
Ventaxia Darkroom Fans
Lightproof Extraction or Intake Ventilation
|Can be fitted into a window panel but comes with all the components needed for fitting into a wall up to 14.5" thick.
Three speed and reversible for intake when wired to a T Series Controller.
Choosing the right size
To get 10 Air Changes per Hour (ACH) specify for the following room volume:
800 cubic feet. - Model TX6DR - - 6" unit
1100 cubic feet - Model TX7DR - - 7" unit
1900 cubic feet - Model TX9DR - - 9" unit
3600 cubic feet - Model TX12DR - 12" unit
These fans have an internal shutter which closes when the fan is switched off; there is a cheaper Model (TL--) without this shutter but this would be a mistake because it allows dust to blow in.
More recent best practice is for 15 ACH so if space allows always go for a bigger unit which can then be run at a slower (quieter) speed and boosted whenever needed