Retrotec Residential Pressure & Air Leakage User Manual
Page 53
Page 53 of 75
Installing spacers for the metering plate
The accuracy of the metering plate is reduced if there are obstructions with six inches upstream, or two inches
downstream of the plate, or if there is a 90 degree bend in the duct directly downstream. The spacers (if
attached) can be used to lessen the impact of any obstructions. Simply place the spacers against the
obstructions, if possible, or install the spacer so that it is on the inside corner of the bend.
Table 14: TrueFlow® Metering Plate spacer selection depending on filter size
Filter Size
Plate #
Spacer 1
Spacer 2
14x20
#14– select 14 on the DM2
-
-
14x25
#14 “
5x14
-
16x20
#14 “
2x20
-
16x24
#14 “
2x20
4x16
16x25
#14 “
2x20
5x16
18x20
#14 “
4x20
-
20x20
#20 – select 22 on the DM2
-
-
20x22
#20 “
2x20
-
20x24
#20 “
4x20
-
20x25
#20 “
5x20
-
20x30
#20 “
10x20
-
24x24
#20 “
4x20
4x24