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2000 Fire Door-Fan Manual updated 2002-05-28 Page 25 of 58
60 gauge readings
Read the upper scale only. Reverse the tubes when you turn the fan around to test in the
other direction.
Taking Readings from Two Blowers
If one blower can't get adequate Room Pressure, remove the upper panel cover and install a
second blower. To be absolutely sure the upper panel will stay in place during the test,
tape the edges of the upper panel to the door frame using clear box sealing tape or
masking tape. Don't use duct tape.
Adjust one or both speed controls until the Room Pressure is at the pressure requested by
the Retrotec software. Ideally, adjust both blowers so that they are both running at about
the same speed, and producing approximately the same Flow Pressure. Don't have one going
flat out and the other idling. Both blowers must have their restrictor plates off, i.e. both on
Range 22. Go through computer program per usual, but choose the
multi-blower check off.
Read the Flow Pressure from both blowers and enter them into the
software separately. Do not add them! If you do not have 2 flow
pressure gauges in your system, read the bottom blower, then unplug the
clear tube #1 from the bottom blower and plug it into upper blower.
Read the upper blower flow pressure. Don't touch the speed controls
between reading one flow pressure and the other.
Enter the flow pressures one at a time. After entering them, you proceed
as usual.