Measuring Airflow - GAYLORD XG-BDL Installation Operation & Maintenance

System Testing
Prior to testing the hoods performance all make up air registers,
should be noted, and measured for airflow, equipment should be in
the push back position, as close as possible to the rear wall. Any
doors, or cross drafts in the vicinity of the hood's should be noted,
and lastly and lastly, all observations, and values need to be recorded
and provided to Gaylord Industries for safe keeping.
Gaylord Balancing
Damper
Static Pressure
Tap
Access to Static
Pressure Tap
FIGURE 18
Static Pressure Tap (UV Hood)
Chart will indicate the DSD as it relates to the dial adjuster for
GFBD models only.
GFBD (%)
100
90
80
70
60
50
40
FIGURE 19
GFBD Correlation Chart

MEASURING AIRFLOW

DSD (in)
4 1/16
3 7/8
2 15/16
2 1/8
1 1/2
15/16
3/8
GBD / GFDB Flow Characteristion Chart
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00 1.00
DSD, (Damper Set Position) (Measured Center Opening Dimension, inches)
Damper Set Position Chart
BDL Hood
SP Tap CFM / LF
0.07
0.10
0.15
0.19
0.23
0.28
0.30
0.36
0.43
0.55
0.63
0.75
14
SP adder (1500 FPM)
SP adder (1800 FPM)
2.00 3.00
FIGURE 20
DS-CL Hood
SP Tap
100 0.10
120 0.12
150 0.15
170 0.17
190 0.21
210 0.25
220 0.34
240 0.37
*Values need to be
265
multiplied by the hood
300
section overall length to
320
get the total CFM.
350
FIGURE 21
Airflow Chart
4.00
CFM / LF
200
240
280
300
340
380
440
460