Home Air Cleaning Systems & Ventilation: Panel from Chemistry of Indoor Environments (CIE 13 of 31)

[@timdestasiohvac]

This is by far the best collection of sound bites that we as consultants, designers and technicians can use to educate and warn our consumers about the snake oil technology being pushed by the HVAC industry. As a HVAC Designer and consultant I compile information just like this so I can help my clients make good decisions on the projects I work with them on. Now I have more ammunition. Thank you!!!

[@nathanbarry9534]

I think it’s important that they made it clear that a big part of the problem is we haven’t defined the problem. Media and adsorbent filtration works, very effectively the issues are noise and scale. Bringing in “clean” air dilutes the pollution. UVGI is a great solution- but it doesn’t excuse skipping the other 2 factors, and in fact requires them to mitigate its negative aspects. It’s old technology- upper room UV was tested 80 years ago.

[@davidfleuchaus]

5:05 - 6:44 Very helpful 8:15 - 8:56 also helpful 14:22 - 17:41 particularly well-spoken and informative. 19:41 air cleaner design and maintenance. 23:23 some wave-links of UV create ozone. 24:40 Photocatalytic devices (PCO) 29:15 “the manufacturer was shocked!” 30:30 ionizers - not effective. 34:16 HEPA work for particles not VOCs. Bio aerosols. Change the filter. 36:23 corruption (wow! Very disappointing. Effective legal pressure on scientists from lawyers hired by hucksters) 38:30 multi-stage device design The best solution is to not create the pollution in the first place. Go to the source. Most air cleaners didn’t work. Some do.

[@davidfleuchaus]

1st, Science-based 2nd, Effective design, verified 3rd, effective marketing 4th, maintenance plan practiced 5th, human factors

[@HomePerformance]

Solid plan DF

[@nathanbarry9534]

I think it’s important that they made it clear that a big part of the problem is we haven’t defined the problem. Media and adsorbent filtration works, very effectively the issues are noise and scale. Bringing in “clean” air dilutes the pollution. UVGI is a great solution- for airborne disease, but it doesn’t excuse skipping the other 2 tools, and in fact requires them to mitigate its negative aspects. - hence why the bus is a perfect example. It’s old technology- upper room UV was tested 80 years ago to fight measles before the vaccine. To meaningfully move the public health needle we need to work on cleaner safer air indoors and out, from all the hazards, but especially airborne pathogens. It will take a layered approach: source reduction, ventilation, filtration, and appropriate use of open air or surface UV. UV needs long dwell times, so UV in a box is mostly worthless. UV in the upper air of an auditorium, classroom, or especially in areas with high traffic and low occupancy times like bathrooms and elevators can solve problems.

[@joeshmoe7899]

54:21 to remove carpet odors in bedroom, switched from an iqair multigas, to an 8" silenced ecm duct fan, 8" carbon filter, merv 13 in a filter box. Getting quiet 200cfm, and excellent air quality, at less than half the price. But, i suspect this put me on a weed grow watch list.

[@HomePerformance]

Nice setup

[@tealkerberus748]

Personally I'd just be getting rid of the carpet. The easy solution!

[@joeshmoe7899]

@@tealkerberus748 yes. But, I'm renting, and the landlord won't remove carpet. Tight market. Could take years to find another place.

[@tealkerberus748]

Anyway from the point of view of biological contaminants in indoor air, something I need to know is how to design the inflow and outflow to a room to maximise the removal of these contaminants. For example, if you have a room with a dinner table and a bunch of people sitting around eating dinner and chatting: where do you put the air vents to flush that air while they're sitting there to remove virus and other pathogenic particles from the air, so that people don't feel a draught, but also don't infect one another?

[@josiah2720]

Exhaust on the kitchen side?

[@nathanbarry9534]

@@tealkerberus748 Up. vent hood over the table. It’s the most straightforward way, but not necessarily easy to retrofit.

[@tealkerberus748]

I'm too early. There's no conversation about the content to engage with yet. First suggestion: if a speaker's accent doesn't match the US tech bro accent that AI cc is trained on, or if you're using highly technical terms like "air" and "formaldehyde", you need to add your own cc.