Installation manual

10
5. Installation (cont’d)
Use the table below to ensure that the ducts you intend to install will be carrying air flows at/or
under the maximum air flow values. Never install a duct if its air flow exceeds the maximum value.
N
OVOCLIMAT CHART FOR SIZE OF DUCT CONNECTED TO REGISTER VS. AIR FLOW
5.3.1 Calculation Example:
Problem:
My installation requires two exhaust registers (both for the bathrooms). I will connect these registers
to a main duct which will connect to the unit (high speed performance value of 110 cfm). What size of
duct should I use for the main exhaust duct and for the two end branches leading to the registers?
(See Figure 7.)
Solution:
Main duct:
Table above indicates a 6” Ø duct: maximum air flow: 110 cfm. The high speed air flow
of 110 cfm equals the maximum value (110). Therefore a 6” Ø duct or larger is an appropriate
choice for the main exhaust duct.
End branches: Each end branch will have to transport an air flow of 55 cfm (110 divided by 2).
Table above indicates a 5” Ø duct: maximum air flow: 65 cfm. The high speed air flow of 55 cfm is
far enough away from the maximum value (65). Therefore a 5” Ø duct or larger is an appropriate
choice for the 2 end branches
.
NOTE: A 4” Ø duct would have been too small because the maximum acceptable value for a 4” Ø
duct is 40 cfm.
5.3.2 Registers Location and Air Flows Distribution:
The registers location and the air flow distribution must be taken in account when performing
ductwork installation. Refer to the Novoclimat table below to plan the registers location.
5.3 CALCULATING THE DUCT SIZE
VI0003
end
branches
main branch
6”ø 110 cfm
5”ø
55 cfm
figure 7
ROUND DUCT RECTANGULAR DUCT MAXIMUM AIR FLOW
4" 2¼" OR 3¼” X 10" 40 CFM
5" 2¼" OR 3¼” X 10" 65 CFM
6" 3¼” OR 4" X 10" 110 CFM
FRESH AIR FLOWS EXHAUST AIR FLOWS
REGISTER MINIMUM MAXIMUM MINIMUM MAXIMUM
LOCATION REQUIRED ACCEPTABLE REQUIRED ACCEPTABLE
KITCHEN - - 0 23,6 L/S (50 PCM)
DINING ROOM 4,7 L/S (10 PCM) 11,8 L/S (25 PCM)- -
L
IVING ROOM 4,7 L/S (10 PCM) 18,9 L/S (40 PCM)- -
O
FFICE 4,7 L/S (10 PCM)9,4 L/S (20 PCM)- -
RECREATION ROOM 4,7 L/S (10 PCM) 18,9 L/S (40 PCM)- -
MASTER BEDROOM 9,4 L/S (20 PCM)9,4 L/S (20 PCM)- -
S
ECONDARY BEDROOM(S)4,7 L/S (10 PCM)9,4 L/S (20 PCM)- -
MAIN BATHROOM - - 23,6 L/S (50 PCM) 51,9 L/S (110 PCM)
S
ECONDARY BATHROOM(S) - - 14,2 L/S (30 PCM) 51,9 L/S (110 PCM)
L
AUNDRY ROOM -- 0-
W
ORKSHOP -- 0-
NON-FINISHED BASEMENT 4,7 L/S (10 PCM) 18,9 L/S (40 PCM) - 23,6 L/S (50 PCM)