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-
CXYT-J~;~
fa Imvl2:ing Board
-
%P.C
19
(R
fram
Fig~w-
37;
-77
X
1
=
. S : "
-
.94
%%n!ttrv
t41e
material used,
su?i'iciat ~&ichess
must 52
I z i 2
?DW.
tn
m 3 3 2 k
e q ~ i ~ ~ d c r t
I<
F x t r x .
The
2 1 m a l ~ J L X ? ~ ~
layer
mzl;
52
c m r ~ r ? d by m y ncg-
cnmbustibIe
rnttuizI
such
as
rncmA,
?It,
~ 1 3 : ~ ~
brick, :lass,
concrete,
marble or
stoce.
W h m
usin:
a
low density
iwnlatine
materid, a
supportingmz~l cover mrh
as
show
i q
?!$re 38
s11wId be f z b r j e a ~ d
2nd
irrs.Aed.
NOTE:
Sam?
nonczrii5us:ible
c o v e r h p
r ~ c 5
2s
m=:d,
s h e ,
s ~ d -
stone
acd m 5 l e
a--e
relativ2y _rood
conduc!ors
o f ~ ~ ~ t
and
must
b :
' x e d
i n
combinaticn
wjll,
the
rnsre
5ermztly
reslstznt
nstensh.
In finishing up
hearth extension,
be
sure
to
fasten it
szcllrely
i o
21s door : o preve3t
sXfi;lrg,
; a d
ses?
5 e
glp
i?r:wr.3 the
firepiace h m e a d
t!~e
h e e h
~ x t - n i ~ n
wi:h
3
~c;.L-zo,y5;r~d?s~
e mztedd [Set?
Fi~l--e
42:.
METAL COVER DESIGN CnNSlSTS
OF
Fc
TOP
AND
3IQFS
I
65
REQUIRED
B Y Z S I G N
NOTCH
C D R N E R S T H E H
SEND FLANGES
I@'
MATE?,lAL:
.?I
e r.rlv.
T ~ I C K N E S S
:IEGA.)
GflLVANIZE3
? 5 "
tAIN.
C R
ALVI.71NIZEO STEEL
FaGbXE
38
E TT:L.
S,Q"EFE' ST!?P-f)rTST'!
;SLT'?S5I2 Clr
CTREPS)
Wrh,
t?lt
? ~ C $ ~ C P
ri5115:~rth I : x : s C ~
ice
no:
k~srdled
at
~ T I F S ~ ?
heifzh-t,
3
cug:oq
sde?rs%tj'? i r ~ z c p k ~ d .
T1.e
~ z f e i y
6+.;;.2
FAISL
be
C X S D J Z T ~
of g : r l ~ r , i ~ * c :
steel wit12 a mini-
mcm
*&chess
cf .OlS.
It
shtauld
jt
rllz?ed
2s
51r.cx:n
iq
Fipre
23.
S5o:~ld be
at
least
315"
hicknmd
meel
l a d Sui_lCi?~
cgde
requirements.
Tlr. W s h d
1 1 . i g l r
of tile 1!rlrr5
ex!m:nn
must n o t
block rhe
inlet
st
h : l e
Isonom of
the
%place.
F i ~ r e
40
show
a
sample of t ! k
we
of
k t a % z ? i ~ n
WWeJthTINQ: EEARTE EXTEUSJON MAY
BE E l -
STALLED OYLY
AS
ILLUSTRATED.
FIGLxES
39
TmOUGH
43
SFEO'IY
DPJOKLALWST-M~tATTTOh'S.
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