Lifebreath 700ERV Selecting the Correct Size HRV/ERV, Commercial and Institutional Requirements

Selecting the Correct Size HRV/ERV

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			Bank
Seats	40		Customers	25
Employees	5		Staff	9
Total	45		Total	34
ASHRAE requirement		20 cfm (10L/s) per person	ASHRAE requirement		20 cfm (10L/s) per person
Ventilation required		45 x 20 = 900 cfm (450 L/s)	Ventilation required		34 x 20 = 680 cfm (320 L/s)

Bar or Tavern			Bingo Hall
Seats	50		Customers	180
Employees	7		Staff	20
Total	57		Total	200
ASHRAE requirement		30 cfm (15L/s) per person	ASHRAE requirement		30 cfm (15L/s) per person
Ventilation required		57 x 30 = 1710 cfm (855 L/s)	Ventilation required		200 x 30 = 6000 cfm (3000 L/s)

Classroom and School Portables			Print Shop, Duplicating
Seats	29		Square footage of shop	2000 square ft (m2)
Teacher	1
Total	30		ASHRAE requirement	0.5 cfm/ft2 (2.5L/s - m2)
ASHRAE requirement		15 cfm (7.5L/s) per person		per person
Ventilation required		30 x 15 = 450 cfm (255 L/s)	Ventilation required	2000 x 0.5 = 1000 cfm (500 L/s)

Beauty Salon		Swimming Pools
Customers	12	Refer to “Pool” Models Installation Manuals.
Employees	6
Total	18
ASHRAE requirement		25 cfm (12.5L/s) per person
Ventilation required		18 x 25 = 450 cfm (255 L/s)

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

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