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N.B.: THE VOLUME OF COLD AIR RETURN SHOULD BE AT LEAST EQUAL
TO THE VOLUME OF THE HOT AIR DISTRIBUTION.
Figure 3.2.4 b
N.B.: THE SIZE OF THE AIR RETURN CONDUITS SHOULD BE AT LEAST
EQUAL TO THE SIZE OF THE COLD AIR PLENUM OPENING.
To ensure adequate static pressure, the amount of cold air return should
exceed the amount of hot air distribution of at least 5%.
Figure 3.2.4 c - Hot air plenum minimal height.
The hot air plenum coming out of the furnace is to have a minimum height of 24"
(610 mm) if the top of the first vertical section is not flush with the first horizontal
section (see Figure 3.2.4 c). Otherwise, the minimum height is 10" (254 mm).
These dimensions for all hot air furnaces are in accordance with the standards
CSA B140.4, UL 391 and UL 727.
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