COVID-19 NATIONAL EMERGENCY ACTION: BMT has shifted production to maximize national availability of BMT VirusGuard NanoScreen filtration products for makers of personal protective safety masks and heavy-duty Safety Barrier Curtain products for indoor workspaces & field operations. LEARN MORE.


BMT AllergyGuard NanoScreen™

BMT AllergyGuard is a high-performance nanofiber screen mesh on rolls. An advanced home and institutional window screen engineered to block most airborne allergens and ultra-fine dust:

  • Unlike conventional window screen, BMT AllergyGuard blocks or restricts a wide range of airborne droplets carrying virus and bacteria as well as pollen, allergens, fly ash, agricultural & coal dust.
  • AllergyGuard forms a defensive barrier to prevent entry of these unwanted airborne particles into the home, office or workspace.
  • Excellent filtration efficiency engineered to block microscopic airborne particles in a nanofiltration mesh range of 20-800 nanometers (0.02 – 0.8 microns).
  • CDC defines airborne droplets carrying most viruses in a size range of 5,000-10,000 nanometers (Note 1) and most are unable to pass through BMT AllergyGuard filtration mesh range.
  • CDC & public research now suggests that some micro virus nuclei airborne particles can be smaller (Note 2) and can pass through many personal protective products, so social distancing remains critical.
  • By comparison, standard window fly screen is limited to filtering only much larger particle sizes of approximately 2,000,000 nanometers.
  • High porosity 80-85% = High permeability for excellent air circulation and flow
  • High strength 3-layer construction for superior durability and puncture resistance
  • Blocks 95% of rain and water / Excellent visibility while blocking more than 90% of UV Light and 50% of Infrared Light
  • Can be used as an effective substitute filtration media in any product designed to reduce the passage of many harmful airborne droplets and help defend against risk of infection.
  • Emergency applications include the inner functional filtration layer of a reusable protective mask, workspace hanging safety curtains, window screen fabric and a range of other uses.
  • Laboratory-certified to meet or exceed ASHRAE 52.2 test standards

References are provided below the BMT AllergyGuard video at the end of this page

For BMT AllergyGuard product brochure, click here.


Watch our Introduction Video Below:



1. CDC I.B.3.b. Droplet transmission. Ref: Par 2.

2. CDC I.B.3.b. Droplet transmission. Ref: Par 2.