The NBCC is primarily a performance based code, and most HVAC requirements
(Part 6) are based on required air changes per hour - how you get those air
changes is up to you as long as you can demonstrate it. However, Part 9 is
a prescriptive 'deemed to comply' section, primarily for small buildings and
dwellings.
Pulling out bits from both Parts 6 and 9, the following might be useful:
Part 6
Storage garages - 3.9 L/s per square metre of floor area.
Heat recovery ventilators - min 25 L/s, max 200 L/s.
Part 9 and its Appendix
There are a couple of tables that determine the size of of intake openings
to avoid excessive depressurization of dwellings, based on fan capacities of
min. 25 L/s, max. 150 L/s. This can go down to 20 L/s, up to 170 L/s for
'airtight' dwellings (i.e. based on R2000 construction standards).
Fan sizes must be based on a calculation procedure using a house's volume -
e.g. a house of 720 m^3 will require total fan capacity of 60 L/s.
The above is a bit disjointed and relates to very specific situations, but I
hope it gives some idea of the numbers involved. As I said, most parts of
the NBCC don't specify fan sizes, etc, just changes of air per hour and
other similar performance based criteria.
John F-L
----- Original Message -----
From: <[email protected]>
To: "U.S. Metric Association" <[email protected]>
Sent: Friday, March 18, 2011 5:13 PM
Subject: [USMA:50093] Re: PC Case fans & flow measurements
What are some typical numbers in L/s or in m^3/s for home ventilation, for
home heating and cooling systems, and for smaller fans (e.g. in
computers)?
---- Original message ----
Date: Fri, 18 Mar 2011 16:16:19 -0000
From: "John Frewen-Lord" <[email protected]>
Subject: [USMA:50092] Re: PC Case fans & flow measurements
To: "U.S. Metric Association" <[email protected]>
The National Building Code of Canada specifies all
ventilation, air supply and air extraction rates in
either L/s or m3/s. Hope this helps.
John F-L
...
