Outside Air Requirements: Must
Be Met in All Commercial Projects and some Residential Projects. Generally,
Outside Air Recommendation is .5 cfm of Pool and Deck Area or 15cfm per
person, whichever is greater.
PER AHSRAE STANDARD 62-1989
“Ventilation
for Acceptable Indoor Air Quality”
Par.
5.1 “When infiltration and
natural ventilation are insufficient
to meet ventilation air requirements,
mechanical ventilation shall be
provided”.
Par. 5.6 “Ventilating ducts and plenums shall be constructed and maintained
to minimize the opportunity for growth and dissemination of micro-organisms through
the ventilation system”. We recommend minimum 50%, maximum 60% RH (relative
humidity) within the space.
CALCULATION PROCEDURE
A.
From ASHRAE 62-1989, Table 2:Outdoor Air
Requirements for swimming pools is 0.50
CFM/sq.ft. of pool and deck area.
B. Same Table indicates outdoor air requirements for spectator facilities is
15 CFM/person.
C. Par. 6.1.3.4 indicates that outdoor air requirements for intermittent used
spaces may be reduced by 50%.
SUMMARY
TABLE
POOL & DECK
AREA (SQ.FT.)
MINIMUM
BUILDING
OUTSIDE AIR (CFM)
Per 6.1.3.4
MINIMUM
BUILDING
OUTSIDE AIR (CFM)
(WITHOUT 6.1.3.4)
MINIMUM
NUMBER
OF OCCUPANTS
(Per 6.1.3.4)
1,000
250
500
33
2,000
500
1,000
66
5,000
1,250
2,500
166
10,000
2,500
5,000
333
15,000
3,750
7,500
500
20,000
5,000
10,000
666
25,000
6,250
1,2500
833
30,000
7,500
15,000
1,000
Note: Add
7.5 CFM for each additional occupant if
using par 6.1.3.4 Note: Add
15 CFM for each additional occupant if not
usingpar 6.1.3.4 Note: Outside
Air Requirements must be met in all commercial
indoor pool projects; not necessarily required
in residential. Follow your own state/local/mechanical
codes. Generally
outside air requirements are for commercial projects.
Determine if your area is following BOCA National
or BOCA International Codes. Review all standards
for current applicable data.
EPS is the home of DRY-AIR & VERI-DRY. We provide Design, Engineering, Consulting and Manufacturing for Residential and Commercial Indoor Swimming Pool Applications.
