Pulmonary Function Filters

BlockAide™ electrostatic filter media, used for our extensive selection of Pulmonary Function Filters, consists of a special blend of polymers with highly stable electrostatic charge on each individual fiber, which allows the filter to consistently achieve high efficiencies by using both electrostatic and mechanical impaction to remove airborne bacteria and viral particles. 

Also see … HMEs & HMEFs

Exceeds ATS recommendations for “Standardization of Spirometry Equipment” for in-line filters having a flow resistance of less than 1.5 cm H2O/L/sec.


  Flow Resistance   0.46 cmH2O/L/sec up to 14 L/min
  Bacterial Filtration Efficiency   99.9%
  Viral Filtration Efficiency   99.9%
  Deadspace, Round Filter   54 mL
  Deadspace, Elliptical Filter   51 mL

Noseclip included in every package.


Download the BlockAide PFT Filters Brochure

Download the PFT Filters brochure


Technical & Educational Resources

Basic Training – Westmed PFT Filters