Determine Fresh AIR Delivery Rate, CFM Delivered

VENTILATION oR Air Cycling (continued)

DETERMINE FRESH AIR DELIVERY RATE

1.Measure the negative static pressure of the return system at the location where the outdoor air duct enters the return duct..

2.See Table 4 for estimated inlet airflow in CFM, based on duct type, length, and available negative pressure.. Use an airflow measuring device for a more accurate airflow delivery rate..

3.Record the Delivered CFM.. __________

Table 4 – CFM Delivered

Negative Static Pressure (“w.c.) as Measured for Return Duct or Plenum

Duct Length	0.05		0.1		0.15			0.2		0.25			0.3
	Flex	Pipe	Flex	Pipe	Flex	Pipe	Flex		Pipe	Flex	Pipe	Flex		Pipe

10 ft.	60	65	85	90	105	110	120		125	135	140	150		160

20 ft.	55	60	80	85	100	105	115		120	130	135	140		150

30 ft.	50	55	75	80	95	100	110		115	125	130	130		140

Note: For the table above, 6” flex duct is laid loose with two, wide 90° bends and a fully opened damper.. Rigid pipe values are based on 6” duct, two 90° elbows, and a fully open damper.. In both cases, the air intake is through a metal vent hood with inlet screen.. Airflow may need to be adjusted up or down for variations in duct work..

DETERMINE CYCLE TIME

1.Use the Required CFM and Delivered CFM from the above steps to determine the Cycle Time from Table 5..

2.The values are listed for a 1 hour Cycle Period.. For a 2 hour Cycle Period, set the Cycle Time to twice the values listed in Table 5..

3.The values highlighted in gray cannot be set due to the maximum 60 minute Cycle Time.. A second ventilation device (i..e.., bigger duct or second duct) will be required to meet ventilation needs..

TABLE 5 – Cycle Time Setting (minutes) for Airflow Delivered vs. Airflow Required for 1 hour Cycle

CFM Delivered					CFM Required
CFM Delivered	20	30	40	50	60		70	80	90	100
	20	30	40	50	60		70	80	90	100

60	20	30	40	50		60	70	80	90	100

80	15	25	30	40		45	55	60	70	75

100	15	20	25	30		35	40	50	55	60

120	10	15	20	25		30	35	40	45	50

140	10	15	15	20		25	30	35	40	45

160	10	10	15	20		25	25	30	35	40

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VENTILATION oR Air Cycling (continued)