•
Max length of 4
•
Max length of 4
•
Max length of 4
•
Max length of 4
–
Deduct 6
–
Deduct 6
–
No more than four 90 degree elbows if possible
–
No more than four 90 degree elbows if possible
–
Do not use plastic or thin foil duct material
–
Do not use plastic or thin foil duct material
•
Use as few joints as possible
•
Use as few joints as possible
•
Duct tape all joints
•
Duct tape all joints
Duct considerations
Duct considerations
"
diameter rigid metal duct
"
diameter rigid metal duct
"
diameter flex metal duct
"
diameter flex metal duct
'
for each elbow
'
for each elbow
–
65
'
–
65
'
–
45
'
–
45
'