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MAKE UP HEAT REQUIREMENT at 1200 CFM (566L/s)
Nominal Nominal Nominal
Outdoor Temp. kW Req. for kW Req. for kW Req. for
C° F° 20°C (68°F) 25°C (77°F) 30°C (86°F)
Air Delivery Air Delivery Air Delivery
0 32 7 10 14
-10 14 10 14 17
-20 -4 12 15 19
-30 -22 15 19 22
-40 -40 17 21 24
Selecting the Correct Size HRV
Commercial and Institutional Requirements
For outdoor air requirements, ASHRAE has produced the Ventilation Standard 62-1989
that is used to determine acceptable ventilation rates. This standard is referenced directly or
used as “Good Engineering Practice” in most Code documents or design criteria.
Small restaurants, Donut Shops and Fast food stores
Seats 40
Employees 5
Total 45
ASHRAE requirement 20 cfm (10 L/s) per person
Ventilation required 45 x 20 = 900 cfm (450 L/s)
Bank
Customers 25
Staff 9
Total 34
ASHRAE requirement 20 cfm (10 L/s) per person
Ventilation required 34 x 20 = 680 cfm (320 L/s)
Bar or Tavern
Seats 50
Employees 7
Total 57
ASHRAE requirement 30 cfm (15 L/s) per person
Ventilation required 57 x 30 = 1710 cfm (855 L/s)
Bingo Hall
Customers 180
Staff 20
Total 200
ASHRAE requirement 30 cfm (15 L/s) per person
Ventilation required 200 x 30 = 6000 cfm (3000 L/s)
Classroom and School Portables
Seats 29
Teacher 1
Total 30
ASHRAE requirement 15 cfm (7.5 L/s) per person
Ventilation required 30 x 15 = 450 cfm (255 L/s)
Print Shop, Duplicating
Square footage of shop 2000 square ft
ASHRAE requirement 0.5 cfm / ft
2
(2.5 L/s - m
2
)
Ventilation required 2000 x 0.5 = 1000 cfm (500 L/s)
Beauty Salon
Customers 12
Employees 6
Total 18
ASHRAE requirement 25 cfm (12.5 L/s) per person
Ventilation required 18 x 25 = 450 cfm (255 L/s)
Swimming Pools
Refer to “Pool” Models Installation Manuals.