Flute Mask – Jill Roy
Flute Mask Instructions
NSBA Performance Mask
Surgical Mask with a horizontal slit.
ADDITION to bell cover instructions
- In addition to the fabric on the bell cover a
paper filter of MERV 13 may be applied.
- Bell covers tested so far were made from pantyhose made of 80 denier in 2 layers.
Photographs: James Kalyn