409097 BFT Replacement Instructions
Topvex Series
BFT - Filter replacement instructions
Systemair Inc.
2
1
Release the lter frame by pulling the lter support 
bars.
2
Tilt the support bars to the back.
3
It is now possible to fold the lter and frame 
backwards. This is especially important if there 
is lack of space in front of the unit and the sliding 
door kit is used.
The lter can now be taken out of the unit.
5
Insert the new lter and fasten it against the inlet seal with the lter support bars. 
Make sure the lter is tted tight all around the frame.
1.2 Topvex FR Changing Supply/Extract air lter
3
Changing pre-lter (only when pre-heater is 
installed)




