ASHRAE Journal - June 2020 - 52

COLUMN HVAC APPLICATIONS

military barracks, housing and dormitories during
and after deployments, and apartments and condominiums that are seasonally occupied. Further,
over the last 20 years, members of ASHRAE's community of building scientists have reported privately
that public accounts do not include most of the
largest and most health-relevant cases of excessive

dampness because of lawsuit settlements that prohibit disclosure.*
In summary, designers and owners who have experienced dampness problems in buildings or would
like to understand and avoid them are encouraged to
download and read the PDF ﬁle of ASHRAE's special
publication titled Damp Buildings, Human Health and
HVAC Design. Also, designers and
speciﬁers of new projects might
wish to obtain the revised ASHRAE
Standard 62.1-2019. In that document, paragraph 5.10 provides full
details of the guidance that limits
the indoor dew-point temperature to 60°F (15°C) during both
occupied and unoccupied hours,
whenever the outdoor dew point is
above that level.

Helping Leaders Create
Better Working Environments
for Hard-Working People

References
1. ASHRAE. 2018. "ASHRAE Position
Document on Limiting Indoor Mold and
Dampness in Buildings."

ESC-SERIES

Semi-Custom
Evaporative Cooling
Technology

S-SERIES

HTHV Technology
✔ 10 Models Ranging from
1,200 to 14,380 CFM
✔ 160ºF Maximum Rise &
Discharge Temp Provides
Energy Efficiency
✔ Exceeds DOE's 90%
High-Efficiency Gas-Fired
Technology Standards
✔ Up To 3.2M BTU/hr

2. Mendel et al. 2018. "Measured
moisture in buildings and adverse health
effects: a review." Indoor Air 28(4):488-499.

✔ 12 Two-Stage Models
Ranging from 2,400 to
56,000 CFM
✔ Indirect, Indirect/Direct,
and Direct with Heat
Exchanger Options
Available
✔ Available with Indirect
Fired or Hot Water
Heating Section

M-SERIES
Make-Up Air
Technology

✔ 9 Models Ranging from
1,800 to 75,000 CFM;
Up to 6,500 MBH
✔ Connectivity To Building
Automation Systems
✔ DX, Chilled Water and
Direct Evaporative Cooling
Options

www.cambridgeair.com * 800.899.1989

S-Series HTHV Heaters * M-Series Make-Up Air * ESC-Series Evaporative Cooling

To learn more  www.cambridgeair.com

ASHRAE JOURNAL

ashrae.org

J U N E 2020

3. ASHRAE. 2020. Damp Buildings, Human
Health and HVAC Design. Atlanta: ASHRAE.
4. Harriman, L., G. Brundrett, R. Kittler.
2001. Humidity Control Design Guide for
Commercial and Institutional Buildings. Atlanta:
ASHRAE.
5. Harriman, L., J.
Lstiburek. 2009. ASHRAE
Guide for Buildings in
Hot and Humid Climates,
Second Edition. Atlanta:
ASHRAE.

https://bit.ly/2YUre1l
Rate this Column

*Don Gatley, P.E., Fellow/Life Member
ASHRAE, retired after a 45-year career
designing HVAC equipment and systems
and investigating building failures. After
79 forensic investigations of building
moisture problems over 25 years, he
reported that 75 of those 79 cases were
caused by either humidity in ventilation
and makeup air that the AC system could
not or did not remove, or not enough dry
makeup air to compensate for the building's exhaust. Because of contractual
restrictions and settlement terms of the
lawsuits that often prompted his investigations, none of those 79 investigations ever
became public.

https://www.bit.ly/2YUre1l http://www.cambridgeair.com http://www.cambridgeair.com https://www.ashrae.org/

ASHRAE Journal - June 2020

Table of Contents for the Digital Edition of ASHRAE Journal - June 2020