Retrotec USACE - Manual (Page 306)

F12 ENERGY & PROCESS ASSESSMENT PROTOCOL
by 1.27 for the rate in L/s needed at a 75 Pa pressure. Using the fan equip-
ment manufacturer’s literature, you can select the amount of airfl ow-producing
equipment needed to perform the test. Portable fans that can test in both posi-
tive and negative directions are preferred (but not explicitly required) by this
protocol. The testing agency must have suffi cient airfl ow-producing equip-
ment to achieve at least 100 percent of the required passing CFM (L/s) airfl ow
rate.
For example, if the building had 100,000 sq ft of envelope area, then it
would require 100,000 x 0.25 = 25,000 CFM to be supplied by the testing
agency (for the building with the 10000 m
2 building envelope area, it would
require equipment with 10,000 x 1.27 = 12,700 L/s air supply capacity.
Using door fan manufacturer’s literature, you can select the equipment
needed to perform the test. Smaller units that can be turned around are not
required by the protocol to create any more than 50 Pa since they can test in
both directions. Larger truck mounted fans must create 75 Pa unless they can
be turned around.
Figure F6. Large commercial
modular door fan: 121,700 L/s
(24,000 cfm) at 75 Pa Figure F5. Commercial modular
door fan: 121,700 L/s (24,000 cfm)
at 75 Pa Figure F4. House testing door fan:
25,350 L/s (5,000 cfm) at 75 Pa
Figure F7. Portable large commercial modular door fan.
Figure F8. Trailer mounted door
fan: 152,100 L/s (30,000 cfm)
at 75 Pa.