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Duct Type Unit
35
(2) Install the round flange so that it can be connected to the fresh air duct, as
is shown in the following figure.
(3) The air duct and round flange duct shall be concealed and kept warm
well.
(4) The fresh air is the air after filtration.
NOTES:
①
. The supply air duct, return air duct and fresh air duct shall have thermal
insulation layer to prevent heat leakage and condensation. Stick the plastic
nail to the air duct, then attach the heat preservation cotton with tinfoil and fix it
with plastic nail cover, finally, seal the connection joint with tinfoil tape tightly;
other materials with good thermal insulation effect can also be used.
②
. Each supply air duct and return air duct shall be fixed on the floor prefabricated
slab with iron support; the air duct joint shall be tightly sealed with glue to
prevent leakage.
③
. The design and construction of air duct shall meet related national engineering
specifications and requirements.
④
. The distance between the edge of return air duct and wall is suggested to be
above 150mm, add filter screen for the return air inlet.
⑤
. Noise reduction and shock absorption shall be considered in air duct design
and construction. Moreover, the noise source shall avoid the crowd, e.g. the
return air inlet shall never be designed at the top of the user (office and rest
area).