AlfaTech HVAC System Strategies for Airborne Diseases

H V A C S Y S T E M S T R A T E G I E S F o r A i r b o r n e D i s e a s e s

AIR DISINFECTION – UVGI DISADVANTAGES

Material Degradation

Some materials degrade under UVC. Sealants, filter material and filter

supports can be impacted on HVAC system.

• Organic filter fibers and Hepa filters have an average of 5-6% weight loss versus fiberglass filter weight loss of 25%

• Other than structural damage, polyester filters may crumble to the touch and lofted fiberglass may irritate eyes (fibers becoming

airborne within ductwork) under UVC exposure.

• UVC resistance ratings shown on Table 8 per ASHRAE RP-1509: A – No effect (aluminum tape, all organic materials

experience mass loss)

B – Minor Effect (mainly cosmetic changes)

C – Moderate Effect (some cracking/pitting)

D – Severe Effect (structural damage, not recommended)

Courtesy of Table 8, ASHRAE RP-1509