SUMMARY 1. All in the industry have been on a learning curve regarding COVID and HVAC; therefore negative comments are not helpful and everyone with a positive solution or input should speak up. 2. The ASHRAE-suggested ventilation changes initially had HVAC systems altered to maximum outdoor air where possible, which was a reasonable first position reaction. 3. ASHRAE altered their position in some steps as new information became available, which is also a logical path. 4. The current ASHRAE suggestion of disabling DCV will prevent conservation circuits from recirculating a lot of heat in buildings, which will dramatically increase HVAC systems’ direct heat atmospheric input and also increase GHG emissions. 5. The current understanding of experts is that the virus is killed by the turbulent act of collecting samples. Accepting this, the turbulence of going through the return and supply fan blades should kill the virus. 6. Knowing whether there is live virus coming through the diffusers feeding the rooms is critical. If the diffuser air has no live virus before the HVAC ventilation changes and no live virus after the ventilation changes, the changes at the fan systems are of no benefit regarding COVID protection; however, the changes are very damaging regarding Climate Change. The suggested testing method on page 11.192 of this manual will allow a non- turbulent environment in the HVAC supply air, providing the required information relating to the HVAC ventilation alterations. 7. If the HVAC alterations provide benefit, it should be weighed against the negative impact on Climate Change created by these alterations. Please send questions or comments to: David Strain (President) APS Analysts of Pneumatic Systems Limited analystsofpneumatic@bellnet.ca OFFICE--(905) 640-2333 11.193
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