Planning Of The Ductwork; Duct Size; Registers - Broan HRV200 ECM Installation Manual

3. INSTALLATION (
CONT
3.3 P D
LANNING OF THE UCTWORK
• Keep it simple. Plan for a minimum of bends and joints.
• Keep the length of insulated and non-insulated ducts to a minimum, because the length of the ductwork impacts directly the unit
airflow performances.
• Do not ventilate crawl spaces or cold rooms. Do not attempt to recover the exhaust air from a dryer or a range hood. This would cause
clogging of the filters and recovery module.
• If the house has two floors or more, be sure to plan for at least one exhaust register on the highest lived-in level.
3.4 D S
UCT IZE
To determine the appropriate duct size to be used, refer to the ASHRAE or HRAI HANDBOOK. Below is an example of a design
for a fully ducted system with a unit having a high speed performance of 160 cfm.
4" Ø, 47
CFM
5" Ø, 93
5" Ø, 67
3.5 I D
NSTALLING THE UCTWORK AND
3.5.1 F D S
ULLY UCTED
Never install a stale air exhaust register in a closed room where a combustion device operates, such as a gas
furnace, a gas water heater or a fireplace.
Stale air exhaust ductwork
• Install the stale air exhaust registers where the contaminants are produced: kitchen, living room, etc. Position the registers as far
from the stairway as possible and in such a way that the air circulates in all the lived-in spaces in the house.
• If a register is installed in the kitchen, it must be located at least 4 feet from the range.
• Install the registers 6 to 12 inches from the ceiling on an interior wall OR install them in the ceiling.
• If possible, measure the velocity of the air flowing through the registers. If the velocity is higher than 400 ft/min, then the register
type is too small. Replace with a larger one.
Fresh air distribution ductwork
• Install the fresh air distribution registers in bedrooms, dining rooms, living room and basement.
• Keep in mind that the fresh air registers must be located as far as possible from the stale air registers.
• Install the registers either in the ceiling or high on the walls with air flow directed towards the ceiling. (The cooler air will then cross
the upper part of the room and mix with room air, before descending to occupant's level.)
• If a register must be floor installed, direct the airflow up the wall.
' )
D
4"
4"
4" Ø,
46
CFM
5"
CFM
6"
CFM
6" Ø, 160
CFM
VI0019
R
EGISTERS
YSTEM
4"
4"
4"
4" Ø,
4" Ø, 24
37
CFM
4"
5" Ø,
74
CFM
5"
6"
6" Ø, 160
CFM
WARNING
!
8
CFM
5" Ø, 62
CFM
4"
5"
5"
5" Ø, 86
CFM