Best Doors in Auckland use an AIRTIGHT NFK 8+1 chain Filter complete with 3 seperate fan extraction systems running from their factory.
The filter has 8 filtering modules +1 emply module where all the ducts enter ( hence the 8+1 notation).
An individual fan on each of the 3 seperate ducting systems, mean that if one section of the plant isnt running , that fan doesnt have to run either, making a considerable saving on power.
Equally, if one particular section of the plant is running extended hours, only that 1 fan needs to run.
The collected dust,exits the end of the chain conveyor via a NRS rotary valve and is blown into a container for removal from site. This system was installed in 2005.