"')"
BdYZa<%,%($<%,%(EB[\#H^cXZ($&'
SECTION 4: DESIGNING THE
SYSTEM
Duct Material
General
Ndj]VkZbVcnX]d^XZhgZ\VgY^c\bV^ca^cZVcY
WgVcX] a^cZ YjXi bViZg^Va# ;dg WZhi gZhjaih! jhZ
bZiVaYjXi[dgi]ZbV^ca^cZVcYWgVcX]a^cZh!i]Zc
jhZh]dgiaZc\i]hd[[aZm^WaZ]dhZidXdccZXiZVX]
bVX]^cZidi]ZWgVcX]a^cZh#
EaVhi^X YjXi ^h Vahd V edejaVg bViZg^Va [dg ]dbZ
h]deh# =dlZkZg! WZ VlVgZ i]Vi i]ZgZ ^h V [^gZ dg
Zmeadh^dc ]VoVgY ^[ eaVhi^X YjXi bViZg^Va ^h jhZY
[dgYjhiXdaaZXi^dcl^i]djiWZ^c\\gdjcYZYV\V^chi
hiVi^XZaZXig^XVaX]Vg\ZWj^aY"je#I]^hide^Xl^aaWZ
Y^hXjhhZY aViZg ^c i]^h hZXi^dc# 6cdi]Zg egdWaZb
l^i]jh^c\eaVhi^X^hi]Vi^i^haZhhZ[[^X^ZcieZg[ddi
i]VcbZiVa#
Plastic duct generates static
electrical buildup that can
cause fire or shock. Properly
ground it to reduce this risk.
Plastic Duct
Figure 31.
:mVbeaZhd[eaVhi^XYjXi^c\
XdbedcZcih#
I]Z edejaVg^in d[ eaVhi^X YjXi ^h YjZ id i]Z [VXi
i]Vi ^i ^h Vc ZXdcdb^XVa VcY gZVY^an VkV^aVWaZ
egdYjXi#>i^hVahdh^beaZidVhhZbWaZVcYZVh^an
hZVaZYV\V^chiV^gadhh#I]Zeg^bVgnY^hVYkVciV\Z
d[ eaVhi^X YjXi [dg Yjhi XdaaZXi^dc ^h i]Z ^c]ZgZci
YVc\Zgd[hiVi^XZaZXig^XVaWj^aY"je#
I]Z BdYZa <%,%($<%,%(E ^h YZh^\cZY id Xda"
aZXi Yjhi [gdb dcZ bVX]^cZ Vi V i^bZ# I]^h XVc
WZ VXXdbea^h]ZY Wn Z^i]Zg XdccZXi^c\ ^i id dcZ
bVX]^cZViVi^bZdgWnXdccZXi^c\^iidbjai^eaZ
bVX]^cZhVcYjh^c\WaVhi\ViZhidXdcigdal]^X]
WgVcX]^hVXi^kZ#
I]Z BdYZa <%,%($<%,%(E ldg`h fj^iZ lZaa Vh
Ved^cid[jhZYjhiXdaaZXidg#I]Zl]ZZahbV`Z^i
ZVhnidbdkZVgdjcYi]Zh]decZVgi]ZbVX]^cZ
WZ^c\jhZY#
Tips for Optimum Performance
6kd^Yjh^c\bdgZi]Vc&%d[[aZm^WaZ]dhZdc
VcnXdccZXi^dc#
s
@ZZe YjXih WZilZZc i]Z Yjhi XdaaZXidg VcY
bVX]^cZhVhh]dgiVhedhh^WaZ#
s
@ZZe YjXi^c\ Y^gZXi^dcVa X]Vc\Zh id V b^c^"
bjb#I]ZbdgZXjgkZY[^ii^c\hndjjhZ!i]Z
\gZViZgi]Zadhhd[hjXi^dcVii]ZYjhiegdYjX"
^c\bVX]^cZ#
s
<gVYjVa Y^gZXi^dcVa X]Vc\Zh VgZ bdgZ Z[[^"
X^Zci i]Vc hjYYZc Y^gZXi^dcVa X]Vc\Zh ^#Z#
jhZ)*ZaWdlh^ceaVXZd[.%ZaWdlhl]Zc"
ZkZgedhh^WaZ#
s
I]Z h^beaZg i]Z hnhiZb! i]Z bdgZ Z[[^X^Zci
VcYaZhhXdhian^il^aaWZ#
