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TST 100 Supply/Exhaust Diffuser

smoke extract fan


The Systemair TST circular supply diffuser. The distribution pattern can be altered and the gap width is adjustable.


The TST is a circular supply diffuser for ceiling installation. The two-part diffuser unit can be adjusted to provide the desired throw. A shielding device is included which can be used to alter the distribution pattern to a directional (180°) pattern.


The TST is manufactured from galvanized sheet metal, with a white powder-coated finish (RAL 9010-80). The TST is available with the following diameters: ø 100, ø 125, ø 160, ø 200, ø 250 and ø 315.

How to use for exhaust air

This device can be used for exhaust air.


The diffuser is installed directly onto the spiral duct and fixed with pop rivets. If the diffuser is fitted to a PER plenum box, there must be a straight length, 4 times the duct’s diameter, in front of the PER plenum box.

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NGM Company is one of the largest suppliers of fans for use in various building ventilation applications.

NGM Company supplyes our clients with a full range of air terminal devices.

Regulating efficiently the natural environment, NGM Company's units can create silently the perfect indoor conditions; your conditions!