Filtrette System

The Low-Cost Alternative to ndd Spirettes!

Filtrette SystemSDI’s Filtrette™ System is the new, LOW COST alternative to the ndd® Spirette™. This two-piece system provides virtually perfect infection protection for spirometry testing.

The Filtrette™ System incorporates a highly efficient single-patient filter that virtually eliminates cross-contamination from patient to patient and from patient to healthcare professional.

The FloTube™ section fits perfectly in ndd spirometers, and can be used more than 50 times before it needs to be replaced, making it both economical and convenient.

The one-time-use AstraGuard™ filter attaches securely to provide a bacterial/viral filter with nearly complete infection protection.

Using the Filtrette™ System will not affect spirometer warranty.


Filtrette™ System Features

  • Lower cost Adapts to fit all ndd instruments
  • Provides 99.9% bacterial and viral efficiency*
  • Reduces risk of cross-contamination for patients and health care professionals
  • Decreases time spent disinfecting equipment
  • Offers low resistance to air flowFeatures small, non-threatening size
  • Has a comfortable oval mouthpiece
  • Exceeds all ATS ERS standards for spirometry



Filtrette™ meets the ATS 24 waveform requirements.

Testing at LDS Hospital (July 2008) proves that the Filtrette™ meets the ATS 24 waveform requirements for spirometry testing.

Click here for details.


     Part No.  Description  Qty.  Packaging
Filtrette System     29-7993-050 Filtrette™ System Kit (1 FloTube, 50 AstraGuard) 50  Box 
   29-7993-100 Filtrette™ System Kit (2 FloTube, 100 AstraGuard) 100   Box
   29-7993-200 Filtrette™ System Kit (4 FloTube, 200 AstraGuard) 200  4 Boxes/50ct 
   29-7993-300 Filtrette™ System Kit (6 FloTube, 300 AstraGuard) 300   Box

Filtrette™ Kits

     Part No.  Description  Qty.  Packaging
Filtrette System w/klip      29-7992-050 Filtrette™ System Kit (1 FloTube, 50 AstraGuard) + The Klip 50  Box 
   29-7992-100 Filtrette™ System Kit (2 FloTube, 100 AstraGuard) + The Klip 100   Box
   29-7992-200 Filtrette™ System Kit (6 FloTube, 200 AstraGuard) + The Klip 200  4 Boxes/50ct 
   29-7992-300 Filtrette™ System Kit (6 FloTube, 300 AstraGuard) + The Klip 300   Box


Filtrette 1

1. Attach FloTube to ndd spirometer.
Filtrette 2

2. Insert single-use AstraGuard filter into FloTube.
Filtrette 3

3. Spirometer is ready to use.


filter cut-awayCross-section of filter

Shows placement of interior media. Edge of media is bonded to exterior housing to form tight seal.
Woven filterInterior filter media

Filter material is tailored to fit inside mouthpiece.



Contact Information


SDI Diagnostics
Ten Hampden Drive
Easton, Massachusetts 02375
Phone: (800) 678-5782
Fax: (508) 230-2752 

SDI Diagnostics