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Retrotec DM-2A Manuel d'utilisateur Page 66

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©Retrotec Inc. 2012
Term
Definition
NFPA
National Fire Protection Association
outdoors
Outside the building in the area around the building.
Pascal (Pa)
A very small metric unit of pressure. There are 249 Pascals in 1” Water Column (the pressure
required to push water up 1” in a tube). One Pascal = 0.000145 psi.
Pressurization
The process of creating a positive pressure in the house by blowing air into the enclosure. Air
is pushed out through all the leaks, causing the smoke to move away from the operator when
checked with an air current tester.
Range configuration
The Open Range, the Range Plate or Range Ring that is used on the fan during a Door Fan test.
See Retrotec’s Fan Range Configuration QuickGuide
Range Plate
The Range attachment on the Retrotec Door, which holds Ranges C8, C6, C4, C3, C2, C1, L4, L2,
and L1. See Retrotec’s Fan Range Configuration QuickGuide.
Range Ring
The plastic Range attachments on the Retrotec Door, which include Range A and Range B. See
Retrotec’s Fan Range Configuration QuickGuide.
reading
A set of simultaneous Room Pressure and Fan Pressure readings. Sometimes referred to as a
data set or test point because it is plotted as one point on a graph.
reference pressure
The pressure at which the ELA is calculated, usually at the test pressure.
room
See “Enclosure”.
room pressure
The pressure difference created by the Door Fan between inside and outside of the enclosure.
This pressure is commonly measured by Channel A on the DM-2 gauge.
Speed Control port
Control port on the DM-2 gauge, labeled “Speed Control”
time averaging
Refers to the digital gauge display that must have an adjustable averaging from 1 second to 1
minute for the purpose of averaging fluctuating pressure signals.
Averaging can be block averages that will update for the length of the average or rolling
(moving) averages that will update continuously by displaying the average over the past time
period.
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