Technically referred to as Respiratory Protective Devices (RPD) The most common masks can be classified as follows:

1. N-95 masks
2. Surgical masks
3. Homemade masks

N-95 RESPIRATORS

CDC does not recommend public use of this masks.

It achieves a very tight fit.

Is very effective in filtration of airborne particles.

Has 95% filtration capacity for particles 0.3 micrometres or bigger.

However, doesn’t 100% eliminate risk of Infection.

Cannot be shared and has limited reuse.

SURGICAL MASKS

Is a loose fitting disposable mask

Offers protection by creating a physical barrier with immediate environment

Protect against large-particle droplets, splashes, sprays, or splatter

Usually has 2-3 layers ie. 2 ply or 3 ply

Has a low filtration capacity and poor protection against particles < 2 micrometres

One cannot share or reuse.

BASIC HOMEMADE MASK

Offers physical barrier for both inward and outward protection

Has a low filtration capacity

Has a low protective factor compared to other masks

Capacity of re-use

MODIFIED HOMEMADE MASKS

Protection of homemade masks can be increased by adding layers to the mask, proper fitting and adding a filter. We propose the use of a sanitary pad as a mask filter.

Filtration Capacity of a Sanitary Pad

Pads consist of 3 main layers

1. Top- non-woven fabric
2. Middle adsorbent material
3. Outer impermeable back sheet with adhesive (Should be removed when using as a mask filter)

The super-fine inner fibers provide filtration capability for micro/nano-size particles

Masks offer protection in two ways:

• Inward protection

Self-protection against transmission by reducing external exposure to particles

• Outward protection

Retention of particles inside of masks to reduce spread of infection to others.

Protective Factors:

1. N-95 Respirators – 99
2. Surgical Masks – 5.3
3. Homemade masks – 3.2

Our homemade masks are now available for online purchases. Visit: https://yallo.co.ke/shop/imara-face-masks-set-of-5/

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