Fresh Air Supply Units

Fresh Air Supply Units are commonly called FASUs or Filtered Air Supply Fans. Fresh Air Supply Units provide clean filtered air into rooms where split system air conditioning has been installed.  Most wall mounted air conditioning units do not add any fresh air to the room. So if all the windows and doors are closed, low levels of oxygen and increased carbon dioxide can occur.

The FASU continuously adds clean, filtered fresh air to the room and can be linked into the power for the air conditioning systems so they operate in parallel.  The FASU is also fitted with speed control to allow adjustment for the number of people and the size of the room.

School classrooms are a typical installation. The Sigrist Design Filtered Air Supply Unit is compliant with the specifications of the State Government for installation statewide in schools.  Other examples are demountable buildings and offices, like site office and mine installations.

Fresh Air Supply Units come in several types with the most commonly installed being product code FASU-FT-146 and in areas of high corrosion the stainless steel version FASU-FT-146-SS316.

The “Heritage” model is the same basic dimensions but narrower for use in thin walled building applications like demountable offices.

Maintenance

Maintenance of the FASU is vital for it to retain it’s filtration and supply air flow.  Filters must be washed regularly and replaced when required.  The replacement product code is FILT-V-F5-412-412-90 that suits the FASU-FT-146 powder coated and stainless steel versions.

Here is a link to understand more about Air Changes Per Hour (ACPH).