MAXIMUM DUCT VELOCITY (FEET PER
MINUITE)
MAIN DUCT*
BRANCH
SUPPLY RETURN SUPPLY RETURN
APPLICATION
1000........800........500........500.......APARTMENTS,
RESIDENTS
1300.......1100.......1000........800.......AUDITORIUMS,
THEATERS
1500.......1300.......1200.......1000.......HOSPITAL
ROOMS, HOTEL ROOMS
2000.......1500.......1600.......1200.......BANKS,
LIBRARIES, OFFICES,
MEETING
ROOMS, RESTAURANTS,
RETAIL STORES
3000.......1000.......2200.......1500.......INDUSTRIAL
*Use branch duct
velocities where sound control
is critical.
CFM= BTUH
1.08xT.D.
(TEMPERATURE DIFFERENCE - DRY BULB)