New Construction in the Lakes Region

John Mercier · 08-22-2021, 03:42 PM

The debate is the best means to achieve the results.

Even on heating cooling... you and I standing in the same room in almost exactly the same conditions may have a different ''comfort level''.

I can consume a beverage - and almost definitely any food - and my comfort level changes.

The same goes for air quality. I am very sensitive to smoke - small particulate matter. Others not so much.

So the debate is a perfect standard, which can never apply universally.
It is why product knowledge and application is so valuable.

XCR-700 · 08-22-2021, 10:18 PM

Quote:

Originally Posted by John Mercier

The debate is the best means to achieve the results.

Even on heating cooling... you and I standing in the same room in almost exactly the same conditions may have a different ''comfort level''.

I can consume a beverage - and almost definitely any food - and my comfort level changes.

The same goes for air quality. I am very sensitive to smoke - small particulate matter. Others not so much.

So the debate is a perfect standard, which can never apply universally.
It is why product knowledge and application is so valuable.

Agreed as long as the debate stays on subject and the debaters do not go on personal attacks. In the world of forums and blogs such matters turn personal really quickly. Too quickly,,, Its just so easy to get frustrated and cut lose and too many fall victim to this pitfall.

Its not at all like debating a similar matter in person.

John Mercier · 08-22-2021, 11:20 PM

It isn't really done on a forum. It is usually member of a particular industry.
This one would be HVAC.

If two people are in a room, and relative humidity is constant... depending on activity and such... their skin surface temperature will be slightly different and they will feel hot or cold.

With air exchange, the same thing.
A certain concentration of a pollutant has differing effects on each of us.
So some may need more exchanges per hour, others less.
And those could vary depending on what the pollutant is.

The industry tries to debate the perfect... but more likely strike a balance for the majority with the understanding that individuals, even in the same household, will differ.

''ASHRAE (formerly called the American Society of Heating, Refrigerating and Air-Conditioning Engineers) recommends (in its Standard 62.2-2016, "Ventilation and Acceptable Indoor Air Quality in Residential Buildings") that homes receive 0.35 air changes per hour but not less than 15 cubic feet of air per minute (cfm) per person. as the minimum ventilation rates in residential buildings in order to provide IAQ that is acceptable to human occupants and that minimizes adverse health effects. ASHRAE also suggests intermittent exhaust capacities for kitchens and bathroom exhaust to help control pollutant levels and moisture in those rooms. ASHRAE also notes that "dwellings with tight enclosures may require supplemental ventilation supply for fuel-burning appliances, including fireplaces and mechanically exhausted appliances.''

See how the standard leaves room for more than the standard...
So if you tighten down to the standard, you may be too tight.

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08-22-2021, 03:42 PM	#1
John Mercier Senior Member Join Date: Jun 2021 Posts: 3,358 Thanks: 3 Thanked 592 Times in 488 Posts	The debate is the best means to achieve the results. Even on heating cooling... you and I standing in the same room in almost exactly the same conditions may have a different ''comfort level''. I can consume a beverage - and almost definitely any food - and my comfort level changes. The same goes for air quality. I am very sensitive to smoke - small particulate matter. Others not so much. So the debate is a perfect standard, which can never apply universally. It is why product knowledge and application is so valuable.

The Following User Says Thank You to John Mercier For This Useful Post:
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08-22-2021, 11:20 PM	#3
John Mercier Senior Member Join Date: Jun 2021 Posts: 3,358 Thanks: 3 Thanked 592 Times in 488 Posts	It isn't really done on a forum. It is usually member of a particular industry. This one would be HVAC. If two people are in a room, and relative humidity is constant... depending on activity and such... their skin surface temperature will be slightly different and they will feel hot or cold. With air exchange, the same thing. A certain concentration of a pollutant has differing effects on each of us. So some may need more exchanges per hour, others less. And those could vary depending on what the pollutant is. The industry tries to debate the perfect... but more likely strike a balance for the majority with the understanding that individuals, even in the same household, will differ. ''ASHRAE (formerly called the American Society of Heating, Refrigerating and Air-Conditioning Engineers) recommends (in its Standard 62.2-2016, "Ventilation and Acceptable Indoor Air Quality in Residential Buildings") that homes receive 0.35 air changes per hour but not less than 15 cubic feet of air per minute (cfm) per person. as the minimum ventilation rates in residential buildings in order to provide IAQ that is acceptable to human occupants and that minimizes adverse health effects. ASHRAE also suggests intermittent exhaust capacities for kitchens and bathroom exhaust to help control pollutant levels and moisture in those rooms. ASHRAE also notes that "dwellings with tight enclosures may require supplemental ventilation supply for fuel-burning appliances, including fireplaces and mechanically exhausted appliances.'' See how the standard leaves room for more than the standard... So if you tighten down to the standard, you may be too tight.