T Frank Flashcards
1
Q
CFM=
A
FPM x AREA little 2
2
Q
FPM=
A
PV x 4005
3
Q
Density of air
A
.075 per cubic food dry air at 70F
4
Q
Velometer measures?
A
Feet per minute (FPM)
5
Q
Balometer measures?
A
CFM
6
Q
Duct traverse
A
Straight and about 6 to 10 duct diameters downstream from elbows transistors or branches
7
Q
Rectangle traverse min and max?
A
12 min 64 max
6in between measurements no less if less then 64 readings are taken
8
Q
Divide by what to get squares
A
Divide by 6” to get your amount of squares
9
Q
Measurement divided by squares to get
A
Distance between squares
10
Q
How many reading in a round duct
A
20
11
Q
Duct size to cross sectional area
A
L x W divided by 144
12
Q
Volume circulated square=
A
Velocity x cords sectional area
