4
3. Select a safety factor (SF). Most users build-in between 10% (SF = 1.1) and 25% (SF =
1.25), or more. If you don’t wish to use a SF, proceed to Step 4.
4. Calculate the minimum total airflow required (Total CFM), as follows:
Total CFM = (V x ACH x SF)
÷
60.
5. # Units Required = Total CFM
÷
CFM rating for the Unit.
6. Always round up to the next whole number. For example, if the minimum requirement is 2.1
units, 3 units are recommended, not 2.
Example 1:
How many 900 CFM units are needed to provide at least 6 ACH in a 25’ x 30’ x 10’ containment area,
with a 20% safety factor?
V = 25 x 30 x 10 = 7,500 Cubic Feet
Total CFM = (7,500 x 6 x 1.2)
÷
60 = 900 CFM
Minimum # PAS Units Req’d = 900 CFM
÷
900 CFM
(airflow of unit)
=
1 Unit Required
Example 2:
How many 900 CFM units are needed to provide at least 5 ACH in a 50’ x 42’ x 10’ containment area,
with a 25% safety factor?
V = 50 x 42 x 10 = 21,000 Cubic Feet
Total CFM = (21,000 x 5 x 1.25)
÷
60 = 2,188 CFM
Minimum # Units = 2,188
÷
900 = 2.4 =
3 Units Required
Note: This example illustrates the importance of a Safety Factor. If no SF were used, only 1,750
CFM (2 units) would be required.
PAS1200 TRANSPORT
Note
: The PAS1200 can be transported in the horizontal position. If extremely poor road conditions
exist, or excessive shock and vibration are expected, take precautionary measures by padding the
unit to provide impact absorption during transport.
Caution
: Always use caution when moving the PAS1200 inside a building or home. The unit weighs
85 pounds. Older structures with weakened floors or staircases may require special considerations
for safe transport.
ELECTRICAL REQUIREMENTS
1. The PAS1200 requires a minimum of 110 volts AC, 60 Hz to operate properly; however,
maximum airflow performance requires 120 volts AC, 60 Hz.
2. Due to momentary start-up current surge, the unit requires a 15 amp circuit that is free of other
loads.
3. Extension cords used for the PAS1200 must be UL listed, heavy duty No. 14/3 AWG industrial
grade 3-wire type. Use of larger numerical gauge (lower capacity wire) power cord(s) may result
in electrical shock, fire hazards and/or damage to unit. The cord(s) must be in good condition
and in continuous lengths (no splicing) and should not exceed a total of 50 feet in length.
Make
certain that any extension cords used do not reduce power to the unit to less than 110 volts. Use
of a voltmeter to confirm adequate voltage is recommended.
4. Check to ensure that any circuit to which the unit is connected is protected by a 15 ampere
circuit breaker. The unit itself is equipped with a 10 amp circuit breaker.
